CN111089702B - A probe for measuring all parameters of subsonic three-dimensional steady flow field - Google Patents
A probe for measuring all parameters of subsonic three-dimensional steady flow field Download PDFInfo
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- CN111089702B CN111089702B CN202010063672.2A CN202010063672A CN111089702B CN 111089702 B CN111089702 B CN 111089702B CN 202010063672 A CN202010063672 A CN 202010063672A CN 111089702 B CN111089702 B CN 111089702B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
- G01M9/065—Measuring arrangements specially adapted for aerodynamic testing dealing with flow
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
本发明属于流场测试技术领域，具体涉及一种测量亚音三维稳态流场全参数的探针，包括探针头部、温度传感器、对流换热槽、绝热绝缘密封件、五个测压孔、引压管通道、探针支杆、引压管和温度传感器线缆。探针头部圆柱形，圆柱形顶端垂直柱体中心线方向有一内凹的球窝结构，球窝内壁开设互不相通的测压中孔、测压上孔、测压下孔、测压左孔和测压右孔，并在球窝的背向开设十字型的对流换热槽，温度传感器置于对流换热槽中并正对测压中孔中心线。本发明探针可同时测量亚音三维稳态流场总温、总压、静温、静压、马赫数、偏转角、俯仰角、速度、密度等参数，具有尺寸小、寿命长、气流不敏感角宽、可靠性高、空间分辨率高、测量精度高的特点。
The present invention belongs to the field of flow field testing technology, and specifically relates to a probe for measuring all parameters of a subsonic three-dimensional steady-state flow field, including a probe head, a temperature sensor, a convection heat exchange groove, an insulating seal, five pressure measuring holes, a pressure pipe channel, a probe support rod, a pressure pipe and a temperature sensor cable. The probe head is cylindrical, and the top of the cylinder has a concave ball socket structure perpendicular to the center line of the cylinder. The inner wall of the ball socket is provided with a pressure measuring middle hole, a pressure measuring upper hole, a pressure measuring lower hole, a pressure measuring left hole and a pressure measuring right hole that are not connected to each other, and a cross-shaped convection heat exchange groove is provided on the back of the ball socket. The temperature sensor is placed in the convection heat exchange groove and faces the center line of the pressure measuring middle hole. The probe of the present invention can simultaneously measure the total temperature, total pressure, static temperature, static pressure, Mach number, deflection angle, pitch angle, speed, density and other parameters of a subsonic three-dimensional steady-state flow field, and has the characteristics of small size, long life, wide airflow insensitive angle, high reliability, high spatial resolution and high measurement accuracy.
Description
Technical Field
The invention belongs to the technical field of flow field testing, and particularly relates to a probe for measuring all parameters of a subsonic three-dimensional steady flow field, which is suitable for measuring all parameters of the subsonic three-dimensional steady flow field of an inlet channel, a fan in an impeller mechanism, an inlet and an outlet of a compressor and an interstage of an impeller.
Background
For the subsonic three-dimensional steady flow fields of inlets and outlets of fans, compressors and the like in impeller machines and between impeller stages, the flow fields are disordered and present strong three-dimensionality due to rotor rotation, staggered arrangement of moving and static blade rows, interaction of main flow and blade tip leakage flow, mutual blending of main flow and wake and the like, and the problems of accurately measuring complex three-dimensional flow field parameters by using the existing test technology and measurement means also exist.
In the existing probe test technology, two methods are generally adopted for measuring complex three-dimensional flow field parameters, namely, pressure probes are utilized to acquire parameters such as pressure, mach number and flow direction of the flow field, temperature probes are utilized to measure the temperature in the flow field, on one hand, the pressure probes and the temperature probes are independently utilized to measure the flow parameters in the flow field, so that in actual measurement, the measurement time and the cost are increased, and the accuracy of test measurement is affected due to the change of the flow field and the position error of the movement of a displacement mechanism in two measurements, on the other hand, a plurality of probes are inevitably utilized to test in order to acquire all three-dimensional steady-state flow field parameters at the same time, so that the interference of the probes on the flow field flow is increased, the complexity of the test is increased, and meanwhile, the measured flow parameters cannot be ensured from the same flow line, additional test errors are brought, and the accuracy of a measurement result is lowered. The other is to use a temperature and pressure combined probe to measure, and the traditional temperature and pressure combined probe is used for arranging a temperature sensor and a pressure sensing hole on the windward side of the probe to face the incoming flow, so that a large space on the surface of the probe is occupied, and the space resolution of flow field measurement is poor.
According to the existing total temperature test technology, the key point of the temperature probe for accurately measuring the total temperature of the air flow is whether the air flow can be stopped at a temperature measuring point, so that most of the temperature probe is designed according to the fact that a temperature sensor is opposite to the main flow direction, a conventional stopping structure for measuring the total temperature of the fluid adopts a stopping cover structure, and the temperature sensor is arranged in the stopping cover; secondly, the strength of the temperature sensor is generally improved by increasing the size of the temperature sensor and the size of the stagnation cover, so that the probe is larger in size and cannot meet the requirements of temperature measurement in narrow spaces such as compressor blades, turbine blades and the like in the impeller machinery, the spatial resolution is poor, thirdly, the insensitive angle of air flow is small, when the deflection angle or pitch angle of incoming flow to be measured is large, the air flow cannot be sufficiently stagnation, and meanwhile, the heat exchange on the surface of the temperature sensor is insufficient, so that the accuracy of total temperature measurement is affected.
The problems of the temperature and pressure combined probes are that the temperature sensor of the existing temperature and pressure combined probes is positioned on the windward side of the head of the probes facing the main flow, the defects of the temperature probes are that the requirements on space resolution in measurement are difficult to meet, the accurate measurement of all parameters of the subsonic three-dimensional steady-state flow field is not suitable, and the researchers hope to accurately acquire all parameter information in the flow field at the same time. Therefore, a probe for measuring the total parameters of the subsonic three-dimensional steady flow field is urgently needed, and is used for measuring the total parameters of the subsonic three-dimensional steady flow field at the inlet and outlet of a subsonic air inlet channel and a fan, a compressor and the like in an impeller machine and between impeller stages.
Disclosure of Invention
The probe aims at solving the problems that the existing probe cannot measure the total temperature, total pressure, static temperature, static pressure, mach number, deflection angle, pitch angle, speed and density parameters of a sub-sound three-dimensional steady flow field at the same time, and the problems that the existing temperature probe is large in size, poor in spatial resolution, small in airflow insensitivity angle, easy to damage a temperature sensor, short in service life, low in reliability and low in measurement accuracy.
The invention provides a probe for measuring all parameters of a three-dimensional steady flow field of a subsonic, wherein the head of the probe is cylindrical, a concave ball socket-shaped structure is arranged at the top end of the cylinder in the direction perpendicular to the central line of the cylinder, the central line of the ball socket is perpendicular to and intersected with the central line of the cylinder, a pressure measurement middle hole is formed at the position, opposite to the main flow direction, of the ball socket, a pressure measurement upper hole, a pressure measurement lower hole, a pressure measurement left hole and a pressure measurement right hole which are not communicated with each other are uniformly formed on the side wall of the ball socket, and the measurement of the parameters of the three-dimensional flow field can be realized by combining the pressure measurement middle hole. In addition, the design thought of the traditional total temperature probe is abandoned, based on years of researches of the applicant, the layout and structural design of placing the temperature sensor on the leeward side of the probe head of the ball socket, which is opposite to the central line of the pressure measurement center hole, are creatively provided, the cross convection heat exchange groove is formed on the leeward side of the probe head, the temperature sensor is arranged in the cross convection heat exchange groove and is opposite to the central line of the pressure measurement center hole, the impact of air flow on the temperature sensor and the influence of dust and oil drops mixed in the air flow on the temperature sensor are effectively reduced, the service life of the temperature sensor is greatly prolonged, the size of the probe head is effectively reduced, the spatial resolution is improved, the convection heat exchange of the air flow and the temperature sensor is enhanced, and the temperature recovery coefficient is higher and stable in a larger deflection angle range. Most importantly, the method can simultaneously measure the total temperature, total pressure, static temperature, static pressure, mach number, deflection angle, pitch angle, speed and density parameters of the sub-tone three-dimensional steady flow field, and overcomes the defects of the traditional three-dimensional steady flow field measuring method.
The technical scheme of the invention is as follows:
1. A probe for measuring total parameters of a three-dimensional steady flow field of subsonic sound is composed of a probe head (1), a temperature sensor (2), a convection heat exchange groove (3), an adiabatic insulating sealing piece (4), a temperature sensor cable leading-out channel (5), a pressure measuring middle hole (6), a pressure measuring lower hole (7), a pressure measuring upper hole (8), a pressure measuring right hole (9), a pressure measuring left hole (10), a pressure leading-in pipe channel (11), a probe supporting rod (12), a pressure leading-in pipe (13) and a temperature sensor cable (14), and is characterized in that the probe head (1) is cylindrical, the top end of the cylindrical is perpendicular to the central line of the cylinder, a concave ball socket structure is arranged, the central line of the ball socket is perpendicular to the central line of the cylinder and is intersected, the pressure measuring middle hole (6) is arranged right opposite to the main flow direction, a pressure measuring lower hole (7), a pressure measuring upper hole (8), a pressure measuring right hole (9) and a pressure measuring left hole (10) are uniformly arranged on the side wall, a cross convection heat exchange groove (3) is arranged on the back wind side of the probe head (1) opposite to the ball socket, different positions of the groove can be used for discharging air, and the air can be self-adaptive to the air flow direction in the cylinder.
2. Further, the diameter of the probe head (1) is 2-8 mm, the length is 5-45 mm, five circular pressure guiding pipe channels (11) and one circular temperature sensor cable leading-out channel (5) which are not communicated with each other are formed along the axial direction of the probe, the five circular pressure guiding pipe channels (11) are respectively communicated with a pressure measuring middle hole (6), a pressure measuring lower hole (7), a pressure measuring upper hole (8), a pressure measuring right hole (9) and a pressure measuring left hole (10) in a ball socket of the probe head (1), and are respectively communicated with five pressure guiding pipes (13) packaged at the joint of the probe head (1) and the probe support rod (12), and the pressure guiding pipes (13) are led out of the tail part of the probe support rod (12) through the pressure guiding pipe channels (11) in the probe support rod (12).
3. Further, the diameter of the concave ball socket structure arranged in the direction perpendicular to the central line of the column body of the probe head (1) is 1-6 mm, the distance between the ball center and the side surface of the cylinder of the probe head (1) is 0-1/6 times of the diameter of the ball socket, the height between the ball socket central line and the end face of the probe head is 0.5-4 mm, the pressure measurement middle hole (6), the pressure measurement lower hole (7), the pressure measurement upper hole (8), the pressure measurement right hole (9) and the pressure measurement left hole (10) are all round and have the same diameter, the diameter is 0.1-1.5 mm, the central line of the pressure measurement middle hole (6) coincides with the central line of the ball socket, the pressure measurement lower hole (7), the pressure measurement upper hole (8), the pressure measurement right hole (9) and the pressure measurement left hole (10) are positioned at the same axial position of the central line of the ball socket and are uniformly distributed in the circumferential direction, the central line of the ball socket is perpendicular to the side wall of the ball socket, and the angle formed between the central line of the pressure measurement middle hole and the ball socket is 20-80 degrees.
4. Further, the heat convection groove (3) is rectangular with the same width and is coincident in center, the width is 1-3 mm, the groove length parallel to the cylindrical center line of the probe head (1) is 0.8-6 mm, the groove depth perpendicular to the center line is equal to the position of the head of the temperature sensor (2), the diameter of the circular channel where the head of the temperature sensor (2) is located is 0.8-3.5 mm, the axial length of the circular channel is 1-7 mm, the axis of the circular channel is coincident with the axis of the temperature sensor cable leading-out channel (5), the central axis of the temperature sensor cable leading-out channel (5) is 0.5-3 mm away from the cylindrical center line, the center line of the cylindrical center line and the center line of the pressure measurement center hole (6) are on the same plane, the head of the temperature sensor (2) is located on the intersection point of the axis of the circular temperature sensor cable leading-out channel (5) and the center line of the center hole (6), the circular channel is opposite to the rectangular center of the heat convection groove (3), the temperature sensor (2) is fixedly arranged on the heat insulation sealing member (4) through the heat insulation sealing member (4), the heat insulation member (14) is fixedly arranged at the end of the heat insulation member (2) and the heat insulation member (14) and the heat insulation member is fixedly arranged in the heat insulation member (2) through the heat insulation member (14) when the probe is fixedly arranged in the heat insulation member (2) and the heat insulation member, and then the opening of the end face of the probe head (1) is covered, welded and packaged, and the axis of the cylinder of the probe head (1) is coincided with the axis of the cylinder of the probe supporting rod (12).
And 5, further calibrating the probe through a calibration wind tunnel to obtain a probe calibration curve, wherein in actual measurement, based on data measured by five pressure measuring holes and a temperature sensor (2), the total temperature, total pressure, static temperature, static pressure, mach number, deflection angle, pitch angle, speed and density parameters of a three-dimensional steady-state flow field to be measured can be obtained simultaneously through data processing according to a calibration coefficient curve and a formula obtained through calibration of the calibration wind tunnel, the service life of the temperature sensor (2) and the air flow insensitive angle range are prolonged, and the measurement spatial resolution and measurement accuracy are improved.
The beneficial effects of the invention are as follows:
compared with the existing subsonic three-dimensional steady flow field probe, the probe for measuring the whole parameters of the subsonic three-dimensional steady flow field can obtain the following beneficial effects through calibrating a wind tunnel:
The pressure probe has the beneficial effects that the traditional five-hole pressure probe and the total temperature probe can only independently measure pressure or temperature, and can simultaneously measure the total temperature, static temperature, total pressure, static pressure, deflection angle, pitch angle, mach number, density and speed parameters of the subsonic three-dimensional steady flow field, so that the interference to the measured flow field is effectively reduced, the test precision is improved, the test operation is simplified, and the test cost is reduced.
The temperature sensor is opposite to the incoming flow by the traditional temperature probe and temperature pressure combined probe, the temperature measurement is carried out on the temperature sensor by means of the incoming flow stagnation, the air flow directly impacts the temperature sensor, the temperature sensor is extremely easy to damage, and the measurement insensitive angle is narrow. The temperature sensor is creatively arranged on the lee side of the head of the probe, so that the design not only increases the range of the insensitive angle of the total temperature, but also can avoid the front impact of the incoming flow on the temperature sensor and reduce the influence of impurities such as dust, oil drops and the like in the incoming flow on the temperature sensor, thereby ensuring the measurement accuracy and effectively prolonging the service life of the temperature sensor.
The traditional temperature and pressure combined probe has the advantages that the temperature sensor and the pressure sensing hole are adjacently arranged on the windward side of the probe head, so that the size of the probe head is increased, the interference of a convection field is large, the installation is difficult, and the space resolution is reduced. According to the invention, five pressure sensing holes are arranged in the concave ball socket on the windward side of the probe head, and the temperature sensor is arranged on the leeward side of the probe head opposite to the pressure sensing holes, so that the simultaneous measurement of multiple parameters on the same flow line is realized, the measurement has high enough spatial resolution, and the space of the probe head is utilized as much as possible, so that the size of the probe head is reduced.
The method has the beneficial effects that the traditional total temperature measurement needs to be added with an additional stagnation cover, so that insufficient heat exchange on the surface of the temperature sensor is inevitably caused during measurement, and the accuracy of the total temperature measurement is affected. The invention utilizes the opposite vortex moving structure in the leeward separating area of the probe head to effectively strengthen the heat exchange between the air flow and the temperature sensor, and simultaneously, the back is provided with the cross-shaped convection heat exchange groove, and due to the influence of pressure distribution, different positions of the groove can be used for air inlet and air outlet, thereby realizing the self-adaption of the random flow direction and strengthening the flow of the air flow in the groove, and the temperature recovery coefficient is high and stable in a larger deflection angle and pitch angle range during measurement.
Drawings
Fig. 1 is a schematic structural diagram of a probe for measuring parameters of a sub-tone three-dimensional steady flow field in accordance with a first embodiment of the present invention.
Fig. 2 is a top view of fig. 1.
Fig. 3 is a left side view of fig. 1.
Fig. 4 is a B-direction view of fig. 1.
The device comprises a 1-probe head, a 2-temperature sensor, a 3-convection heat exchange groove, a 4-heat insulation sealing element, a 5-temperature measurement channel, a 6-pressure measurement middle hole, a 7-pressure measurement lower hole, an 8-pressure measurement upper hole, a 9-pressure measurement right hole, a 10-pressure measurement left hole, a 11-pressure guiding pipe channel, a 12-probe supporting rod, a 13-pressure guiding pipe and a 14-temperature measurement lead.
Fig. 5 is a schematic diagram of a probe for measuring a three-dimensional flow field in an air intake channel according to a first embodiment of the present invention.
Wherein, 1-the wall surface of the air inlet channel and 2-the probe of the invention.
Fig. 6 is a schematic diagram of a probe for measuring a three-dimensional flow field between compressor stages in accordance with a second embodiment of the present invention.
Wherein, the device comprises a 1-casing wall surface, a 2-hub wall surface, a 3-first-stage stator, a 4-second-stage rotor, a 5-probe of the invention and a 6-second-stage stator.
Fig. 7 is a schematic structural diagram of a probe for measuring parameters of a sub-tone three-dimensional steady flow field in accordance with a second embodiment of the present invention.
Fig. 8 is a left side view of fig. 7.
Fig. 9 is a top view of fig. 7.
The device comprises a 1-probe head, a 2-temperature sensor, a 3-convection heat exchange groove, a 4-heat insulation sealing piece, a 5-temperature measurement channel, a 6-pressure measurement middle hole, a 7-pressure measurement lower hole, an 8-pressure measurement upper hole, a 9-pressure measurement right hole, a 10-pressure measurement left hole, a 11-pressure guiding pipe channel, a 12-probe supporting rod, a 13-pressure guiding pipe and a 14-temperature measurement lead.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention.
Embodiment one:
For an aeroengine air inlet channel, the flow channel is longer, the surface layer is thicker, and the incoming flow is more uniform, but because the speed in the air inlet channel is higher, impurities such as dust, rainwater and the like can be contained. The probe head (1) and the supporting rod (12) are selected to have larger diameters to ensure strength and rigidity, the pressure sensing holes (6, 7, 8, 9, 10) can be selected to have larger diameters to prevent the pressure sensing holes from being polluted by dust, rainwater and other impurities, and the temperature sensor can adopt an armored thermocouple to ensure service life, so the following implementation cases can be adopted:
Fig. 1 to 4 show a probe for measuring all parameters of a three-dimensional steady flow field of a sub-tone according to the present invention, and fig. 5 is a schematic diagram of the probe for measuring a three-dimensional flow field of an engine inlet channel according to the present invention. A probe for measuring all parameters of a three-dimensional steady flow field of subsonic sound is composed of a probe head (1), a temperature sensor (2), a heat convection groove (3), a heat insulation sealing piece (4), a temperature sensor cable leading-out channel (5), a pressure measurement middle hole (6), a pressure measurement lower hole (7), a pressure measurement upper hole (8), a pressure measurement right hole (9), a pressure measurement left hole (10), a pressure leading-in pipe channel (11), a probe support rod (12), a pressure leading-in pipe (13) and a temperature sensor cable (14), and is characterized in that the probe head (1) is cylindrical, the top end of the cylindrical is provided with a concave ball socket-shaped structure perpendicular to the central line of the cylinder, the central line of the ball socket is perpendicular to the central line of the cylinder and is intersected, the pressure measurement middle hole (6) is arranged right opposite to the main flow direction, the pressure measurement lower hole (7), the pressure measurement upper hole (8), the pressure measurement right hole (9) and the pressure measurement left hole (10) are uniformly arranged on the side wall, the cross-shaped heat convection groove (3) is arranged on the back side of the probe head (1) opposite to the back wind side of the ball socket, different positions of the groove can be used for discharging air, and the air flow can be realized, and the air flow can be self-adaptive to the flow direction in the direction of the air flow groove.
The diameter of the probe head (1) is 8 mm, the length of the probe head is 45 mm, five circular pressure guiding pipe channels (11) which are not communicated with each other and a circular temperature sensor cable leading-out channel (5) are formed along the axial direction of the probe, the five circular pressure guiding pipe channels (11) are respectively communicated with a pressure measuring middle hole (6), a pressure measuring lower hole (7), a pressure measuring upper hole (8), a pressure measuring right hole (9) and a pressure measuring left hole (10) in a ball socket of the probe head, and are respectively communicated with five pressure guiding pipes (13) which are packaged at the joint of the probe head (1) and the probe support rod (12), and the pressure guiding pipes (13) are led out of the tail part of the probe support rod (12) through the pressure guiding pipe channels (11) in the probe support rod (12).
The diameter of the concave ball socket structure of the probe head (1) perpendicular to the direction of the central line of the column is 6mm, the ball center is positioned on the side surface of the cylinder of the probe head (1), the distance between the central line of the ball socket and the end surface of the probe head (1) is 4mm, the pressure measurement middle hole (6), the pressure measurement lower hole (7), the pressure measurement upper hole (8), the pressure measurement right hole (9) and the pressure measurement left hole (10) are all round and have the same diameter and are 1mm, the central line of the pressure measurement middle hole (6) coincides with the central line of the ball socket, the pressure measurement lower hole (7), the pressure measurement upper hole (8), the pressure measurement right hole (9) and the pressure measurement left hole (10) are positioned on the same axial position of the central line of the ball socket and are uniformly distributed in the circumferential direction of the ball socket, the central line of the ball socket is perpendicular to the side wall of the ball socket, and the angle between the central line and the central line of the pressure measurement is 60 degrees.
The heat convection groove (3) is rectangular with the same width and the centers coincide, the widths are 3mm, the groove length parallel to the cylindrical center line of the probe head (1) is 6mm, the groove depth perpendicular to the center line is equal to the position of the head of the temperature sensor (2), the diameter of a circular channel where the head of the temperature sensor (2) is located is 3mm, the axial length of the circular channel is 7mm, the axis of the circular channel coincides with the axis (5) of a cable lead-out channel of the temperature sensor, the central axis of the cable lead-out channel (5) of the temperature sensor is 1.5 mm away from the center line of the cylinder, the center axis of the cable lead-out channel (5) of the temperature sensor, the center line of the cylinder and the center line of the pressure measuring center hole (6) are on the same plane, the head of the temperature sensor (2) is located at the intersection point of the axis of the circular cable lead-out channel (5) of the temperature sensor and the center line of the pressure measuring center hole (6), the circular channel is opposite to the rectangular center of the heat convection groove (3), the temperature sensor (2) is fixed through a heat insulation insulating sealing piece (4), the insulating sealing piece (4) is positioned to the heat insulation, the heat insulation sealing piece (4) is sealed, the central axis is the central axis of the cable lead-out channel (5) is 1.5 mm away from the center line of the cylinder, the center line of the heat sensor is located at the same plane, the heat insulation piece (14) is fixed on the temperature sensor (2) through the heat insulation sealing piece (2) and the heat sensor (12), and then the opening of the end face of the probe head (1) is covered, welded and packaged, and the axis of the cylinder of the probe head (1) is coincided with the axis of the cylinder of the probe supporting rod (12).
The probe for measuring the total parameters of the three-dimensional steady flow field of the subsonic wave can measure the total temperature, total pressure, static temperature, static pressure, mach number, deflection angle, pitch angle, speed and density of the three-dimensional steady flow field of the subsonic wave. The specific using method is as follows:
the first step is to make the incoming flow through the probe head in a calibrated wind tunnel with known Mach number and temperature of the incoming flow;
Measuring the pressure of 5 pressure sensing holes on the windward side surface of the probe and the temperature of a leeward side temperature sensor under different working conditions;
and thirdly, determining calibration curves of total pressure coefficients, static pressure coefficients, deflection angle coefficients and total temperature recovery coefficients under different Mach numbers and different deflection angles and pitch angles through data processing according to data obtained through calibration. The deflection angle coefficient, the pitch angle coefficient, the total pressure coefficient, the static pressure coefficient and the temperature recovery coefficient are defined as follows:
Wherein, C py is deflection angle coefficient, C pp is pitch angle coefficient, C pt is total pressure coefficient, C ps is static pressure coefficient, C T is temperature recovery coefficient, total incoming flow pressure, static pressure and total gentle static temperature in the calibrated wind tunnel are P t、Ps、Tt and T s respectively, pressure values measured by a five-hole pressure probe middle hole, zuo Kong, a right hole, an upper hole and a lower hole are P 1、P2、P3、P4 and P 5 respectively, and temperature values measured by a temperature sensor are T p.
And fourthly, inserting the probe into the flow field to be measured when the probe is used, obtaining the pressure measured by the five pressure measuring holes and the temperature measured by the temperature sensors, and obtaining the total temperature, the total pressure, the static temperature, the static pressure, the Mach number, the deflection angle, the pitch angle, the speed and the density of the three-dimensional steady-state flow field according to a calibration coefficient curve in experimental calibration and by combining the following formulas based on the pressure measured by the five pressure measuring holes and the temperature data measured by the temperature sensors.
c2＝γRTs
PS＝ρRTS
Where γ is the adiabatic index of the flow field, ma is the Mach number of the flow field, v is the flow field velocity, c is the local acoustic velocity of the flow field, ρ is the incoming flow density, and R is the gas constant.
The total temperature, total pressure, static temperature, static pressure, mach number, deflection angle, pitch angle, speed and density of the subsonic three-dimensional steady flow field can be obtained by adopting a single probe.
Implementation case two:
For the measurement of the three-dimensional flow field between the turbine stages, the measurement space is narrow, the three-dimensional nature of the incoming flow is strong, in order to ensure the spatial resolution, the lateral size and the pressure measuring hole diameter of the head of the probe should be selected to be smaller, and the temperature sensor can adopt a bare wire thermocouple with smaller size to ensure the fine measurement and improve the measurement precision, so the following implementation modes can be adopted:
Fig. 6 to 8 show a probe for measuring all parameters of a subacoustic three-dimensional steady flow field according to the present invention, and fig. 9 shows a schematic diagram of the probe for measuring a three-dimensional flow field between stages of a compressor according to the present invention. The invention discloses a probe for measuring all parameters of a three-dimensional steady flow field of subsonic, which consists of a probe head (1), a temperature sensor (2), a heat convection groove (3), an adiabatic insulating sealing piece (4), a temperature sensor cable leading-out channel (5), a pressure measurement middle hole (6), a pressure measurement lower hole (7), a pressure measurement upper hole (8), a pressure measurement right hole (9), a pressure measurement left hole (10), a pressure guide pipe channel (11), a probe support rod (12), a pressure guide pipe (13) and a temperature sensor cable (14), and is characterized in that the probe head (1) is cylindrical, the top end of the cylindrical is provided with a concave ball socket-shaped structure in the direction perpendicular to the central line of the cylinder, the central line of the ball socket is perpendicular to and intersected with the central line of the cylinder, the pressure measurement lower hole (7), the pressure measurement upper hole (8), the pressure measurement right hole (9) and the pressure measurement left hole (10) which are not communicated with each other are uniformly arranged on the side wall of the ball socket, and the cross heat convection groove (3) is arranged on the back side of the probe head (1) which is opposite to the ball socket.
The diameter of the probe head (1) is 3 mm, the length of the probe head is 10mm, five circular pressure guiding pipe channels (11) which are not communicated with each other and a circular temperature sensor cable leading-out channel (5) are formed along the axial direction of the probe, the five circular pressure guiding pipe channels (11) are respectively communicated with a pressure measuring middle hole (6), a pressure measuring lower hole (7), a pressure measuring upper hole (8), a pressure measuring right hole (9) and a pressure measuring left hole (10) in a ball socket of the probe head (1), and are respectively communicated with five pressure guiding pipes (13) which are packaged at the joint of the probe head (1) and the probe support rod (12), and the pressure guiding pipes (13) are led out of the tail part of the probe support rod (12) through the pressure guiding pipe channels (11) in the probe support rod (12).
The diameter of the concave ball socket structure of the probe head (1) perpendicular to the direction of the central line of the column body is 2mm, the distance between the ball center and the side surface of the cylinder of the probe head (1) is 1/6 times of the diameter of the ball socket, the height between the ball socket central line and the end surface of the probe head (1) is 1.5 mm, the pressure measurement middle hole (6), the pressure measurement lower hole (7), the pressure measurement upper hole (8), the pressure measurement right hole (9) and the pressure measurement left hole (10) are all round and have the same diameter, the central line of the pressure measurement middle hole (6) coincides with the central line of the ball socket, the pressure measurement lower hole (7), the pressure measurement upper hole (8), the pressure measurement right hole (9) and the pressure measurement left hole (10) are positioned at the same axial position of the central line of the ball socket and are uniformly distributed in the circumferential direction, the central line of the ball socket is perpendicular to the side wall of the ball socket, and the angle formed by the central line of the pressure measurement middle hole (6) is 30 degrees.
The heat convection groove (3) is rectangular with the same width and is coincident in center, the width is 1.5 mm, the length of the groove parallel to the cylindrical center line of the probe head (1) is 2mm, the depth of the groove perpendicular to the center line is equal to the position of the temperature sensor head, the diameter of the circular channel where the temperature sensor head is located is 1mm, the axial length of the circular channel is 3mm, the axis of the circular channel is coincident with the axis (5) of the temperature sensor cable leading-out channel, the central axis of the temperature sensor cable leading-out channel (5) is 0.5 mm away from the cylindrical center line, the central axis of the temperature sensor cable leading-out channel (5), the cylindrical center line and the center line of the pressure measurement center hole (6) are on the same plane, the head of the temperature sensor (2) is located at the intersection point of the axis of the circular temperature sensor cable leading-out channel (5) and the center line of the pressure measurement center hole (6), and is opposite to the rectangular center of the heat convection groove (3), the temperature sensor (2) is fixed through the insulating sealing piece (4), the insulating sealing piece (4) plays roles of insulation, the central axis of the temperature sensor cable leading-out channel (5) is 0.5 mm away from the cylindrical center line, the central axis of the temperature sensor cable leading-out channel (5) is located at the end face of the probe (2) is sealed by the insulating sealing piece (2) and the insulating sealing piece (14), the end face of the probe (2) is sealed in the insulating sealing piece is sealed after the probe (1) is sealed by the insulating end face (1) and the insulating end face is sealed, the axis of the cylinder of the probe head (1) coincides with the axis of the cylinder of the probe supporting rod (12).
Claims (1)
1. The method for using the probe for measuring the total parameters of the subsonic three-dimensional steady flow field to realize the use of the inlet and outlet of a fan compressor and the subsonic three-dimensional steady flow field between stages in an impeller machine is characterized in that the probe head (1), a temperature sensor (2), a convection heat exchange groove (3), a heat insulation sealing piece (4), a temperature sensor cable leading-out channel (5), a pressure measurement middle hole (6), a pressure measurement lower hole (7), a pressure measurement upper hole (8), a pressure measurement right hole (9), a pressure measurement left hole (10), a pressure guide pipe channel (11), a probe supporting rod (12), a pressure guide pipe (13) and a temperature sensor cable (14) are used, the probe head (1) is cylindrical, the cylindrical top end is perpendicular to the central line direction of a cylinder and is perpendicular to the central line of the cylinder, the central line of the cylinder is perpendicular to and intersected, the middle hole (6) is formed in the position facing the main flow direction of the ball socket, the side wall is uniformly provided with a pressure measurement lower hole (7), the pressure measurement upper hole (8), the pressure measurement right hole (9) and the left hole (10) are communicated with each other, the pressure measurement left hole (10) is also formed in the opposite direction of the ball socket, and the opposite direction of the air inlet channel can be adapted to the opposite to the air inlet of the probe head (1;
The diameter of the probe head (1) is 2-8 mm, the length of the probe head is 5-45 mm, five circular pressure guiding pipe channels (11) which are not communicated with each other and one circular temperature sensor cable leading-out channel (5) are formed along the axial direction of the probe, the five circular pressure guiding pipe channels (11) are respectively communicated with a pressure measuring middle hole (6), a pressure measuring lower hole (7), a pressure measuring upper hole (8), a pressure measuring right hole (9) and a pressure measuring left hole (10) in a ball socket of the probe head (1), and are respectively communicated with five pressure guiding pipes (13) which are packaged at the joint of the probe head (1) and the probe support rod (12), and the pressure guiding pipes (13) are led out of the tail part of the probe support rod (12) through the pressure guiding pipe channels (11) in the probe support rod (12);
The diameter of the concave ball socket structure of the probe head (1) perpendicular to the direction of the central line of the column is 1-6 mm, the distance between the ball center and the side surface of the cylinder of the probe head (1) is 0-1/6 times of the diameter of the ball socket, the height between the ball socket central line and the end surface of the probe head is 0.5-4 mm, the pressure measurement central hole (6), the pressure measurement lower hole (7), the pressure measurement upper hole (8), the pressure measurement right hole (9) and the pressure measurement left hole (10) are all round and have the same diameter, the central line of the pressure measurement central hole (6) coincides with the central line of the ball socket, the pressure measurement lower hole (7), the pressure measurement upper hole (8), the pressure measurement right hole (9) and the pressure measurement left hole (10) are positioned on the same axial position of the central line of the ball socket and are uniformly distributed in the circumferential direction of the ball socket, the central line of the ball socket is perpendicular to the side wall of the ball socket, and the angle formed by the central line of the pressure measurement central hole is 20-80 degrees;
The heat convection groove (3) is rectangular with the same width and is coincident in center, the width is 1-3 mm, the groove length parallel to the cylindrical center line of the probe head (1) is 0.8-6 mm, the groove depth perpendicular to the center line is 0.8-3.5 mm, the diameter of a circular channel where the head of the temperature sensor (2) is located is 0.8-3.5 mm, the axial length of the circular channel is 1-7 mm, the axis of the circular channel is coincident with the axis of a temperature sensor cable leading-out channel (5), the central axis of the temperature sensor cable leading-out channel (5) is 0.5-3 mm away from the cylindrical center line, the central axis of the temperature sensor cable leading-out channel (5), the cylindrical center line and the center line of a middle hole (6) are on the same plane, the head of the temperature sensor (2) is located at the intersection point of the axis of the circular temperature sensor cable leading-out channel (5) and the center line of the middle hole (6), the temperature sensor (2) is opposite to the center of the rectangular heat convection groove (3), the temperature sensor (2) is fixed to the heat insulation sealing member (4) through the heat insulation sealing member, the heat insulation member (14) is fixed on the heat insulation member (2) and the heat insulation member (14) is fixed on the heat insulation member, the heat insulation member is fixed on the heat insulation member (2) and the heat insulation member is sealed and the heat insulation member is fixed on the heat insulation member (sealing member (2) when the probe (2) is arranged, then the opening of the end face of the probe head (1) is covered, welded and packaged, and the axis of the cylinder of the probe head (1) is overlapped with the axis of the cylinder of the probe supporting rod (12);
The method comprises the steps of firstly enabling incoming flow to flow through the head of a probe in a calibration wind tunnel with known incoming flow Mach number and temperature, secondly measuring the pressure of 5 pressure sensing holes on the windward side surface of the probe under different working conditions and the temperature of a leeward side temperature sensor, thirdly determining calibration curves of total pressure coefficients, static pressure coefficients, deflection angle coefficients and total temperature recovery coefficients under different Mach numbers and different deflection angles through data processing according to data obtained through calibration, and fourthly inserting the probe into a flow field to be measured when in use to obtain the temperature measured by the pressure and temperature sensors measured by the five pressure measuring holes, and obtaining the total temperature, the total pressure, the static temperature, the static pressure, the Mach number, the deflection angle, the pitch angle, the speed and the density of a three-dimensional steady-state flow field according to calibration coefficient curves in experimental calibration.
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| CN111380667B (en) * | 2020-05-06 | 2024-05-28 | 中国空气动力研究与发展中心超高速空气动力研究所 | Device for reducing scouring damage of hypersonic wind tunnel tail gas to test model sensor |
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| US7010970B2 (en) * | 2001-01-12 | 2006-03-14 | Rediniotis Othon K | Embedded-sensor multi-hole probes |
| CN102141447B (en) * | 2010-12-31 | 2012-07-25 | 中国航天科技集团公司第六研究院第十一研究所 | Total temperature/total pressure and static probe |
| CN104713693A (en) * | 2014-12-15 | 2015-06-17 | 中国燃气涡轮研究院 | Pressure-leading type supersonic velocity five-hole probe with orthogonal auxiliary holes |
| CN106885681A (en) * | 2017-03-02 | 2017-06-23 | 北京航空航天大学 | A kind of monocline hole dynamic pressure probe for measuring rotor outlet subsonics three-dimensional flow field |
| CN106768827A (en) * | 2017-03-06 | 2017-05-31 | 北京航空航天大学 | A kind of steady temperature force combination probe for measuring transonic speed two-dimensional flow field |
| CN106871968B (en) * | 2017-03-30 | 2020-07-03 | 北京航空航天大学 | Probe for measuring total pressure of total temperature of multiple points of subsonic flow field |
| CN106989896B (en) * | 2017-04-17 | 2021-09-07 | 北京航空航天大学 | A dynamic temperature-pressure combined probe for measuring subsonic three-dimensional unsteady flow field |
| CN107014434B (en) * | 2017-04-17 | 2020-04-28 | 北京航空航天大学 | Cone head steady-state temperature and pressure combined probe for measuring high subsonic three-dimensional flow field |
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