CN106885682A - A kind of cylindrical type diplopore dynamic pressure probe for measuring rotor outlet subsonics three-dimensional flow - Google Patents

Abstract

The invention belongs to the technical field of pressure testing, and discloses a cylindrical dual-hole dynamic pressure probe for measuring the subsonic three-dimensional flow at the outlet of a rotor, which includes a probe head and a support rod. The chamfered body encapsulates two dynamic pressure sensors inside, and a pressure sensing hole is opened on the inclined surface of the cylindrical chamfered body and the side of the cylinder on the same side, respectively communicating with different pressure sensors in the package, and the sensor cable passes through the probe The channel in the rod leads to the tail of the probe. The present invention can measure the circumferential distribution of three-dimensional flow parameters such as pitch angle, deflection angle, total pressure, static pressure and Mach number from the pressure surface to the suction surface in the subsonic three-dimensional flow field at the outlet of the rotor through the calibration of the wind tunnel. Improve the performance of the rotor to provide a basis for measured data. Compared with the porous dynamic pressure probe for measuring subsonic three-dimensional flow field, two dynamic pressure sensors are installed in the head, which has the advantages of simple structure, small size and low cost.

Description

A cylindrical dual-hole dynamic pressure probe for measuring subsonic three-dimensional flow at the rotor outlet

technical field

The invention belongs to the technical field of pressure testing, and relates to a dynamic pressure measuring device for a subsonic unsteady flow field, in particular to a cylindrical double-hole dynamic pressure probe for measuring the subsonic three-dimensional flow at the outlet of a rotor, which is suitable for measuring the subsonic flow at the outlet of a turbomachinery rotor. In the sonic three-dimensional flow field, the circumferential distribution of three-dimensional flow parameters such as pitch angle, deflection angle, total pressure, static pressure and Mach number from the pressure surface to the suction surface.

Background technique

Due to the rotation of the rotors of compressors, fans, turbines, compressors, blowers, pumps, etc., it is impossible to measure the dynamic flow field of the rotor outlet by using a conventional steady-state pressure probe, and it is impossible to distinguish the flow from the pressure surface to the suction surface of the rotor outlet. According to the circumferential distribution of flow parameters, the hot wire anemometer can measure the dynamic velocity signal at the rotor outlet, but it cannot provide dynamic pressure information. For the turbine test, it is more desirable to obtain measurement data containing dynamic pressure information at the rotor outlet. For the subsonic three-dimensional flow field at the rotor outlet, it is hoped to obtain three-dimensional flow parameters such as rotor outlet pitch angle, deflection angle, total pressure, static pressure, and Mach number. Circumferential distribution to the suction face for validation of rotor design and flow field diagnostics for improved machine performance.

The dynamic pressure probe for measuring subsonic three-dimensional unsteady flow parameters at the outlet of the rotor has at least 4 pressure sensing holes, and 4 dynamic pressure sensors are installed inside. To measure flow field, on the other hand, the cost of dynamic pressure probe is too high.

Contents of the invention

The technical problem to be solved by the present invention is to measure the circumferential distribution of three-dimensional flow parameters such as pitch angle, deflection angle, total pressure, static pressure and Mach number from the pressure surface to the suction surface in the subsonic three-dimensional flow field at the outlet of the turbine rotor.

Therefore, the present invention provides a cylindrical dual-hole dynamic pressure probe for measuring the subsonic three-dimensional flow at the outlet of the rotor. Compared with the multi-hole dynamic pressure probe, only two dynamic pressure sensors are installed on the head, which has a simple structure, Small in size and low in cost, it is suitable for measuring the circumferential distribution of three-dimensional flow parameters such as pitch angle, deflection angle, total pressure, static pressure and Mach number from the pressure surface to the suction surface in the three-dimensional flow field at the outlet of a subsonic rotor.

Technical solution of the present invention is:

1. A cylindrical dual-hole dynamic pressure probe for measuring the subsonic three-dimensional flow at the outlet of the rotor, characterized in that it includes a probe head (1) and a support rod (2), and the probe head (1) includes The cylinder (3) and the cylindrical chamfer (4) with the same bottom surface independently package two dynamic pressure sensors inside; on the inclined surface of the cylindrical chamfer (4) of the probe head (1), there is a The pressure sensing hole is a slanted hole (5), and the slanted hole (5) is only in communication with a packaged dynamic pressure sensor; on the same side of the inclined plane of the cylindrical chamfered body (4) of the probe head (1), the cylinder directly below There is another pressure sensing hole on the side of the body (3), which is a positive hole (6), and the positive hole (6) is only communicated with another dynamic pressure sensor packaged; the center line of the inclined hole (5), the positive hole (6) ) and the axis of the cylinder (3) of the probe head (1) are on the same plane; the axis of the cylinder (3) of the probe head (1) coincides with the axis of the probe pole (2).

2. Further, the diameter of the oblique hole (5) is 0.6 mm to 1.5 mm, and the distance between the center of the oblique hole (5) and the lowest point of the oblique surface of the cylindrical oblique body (4) is 1 mm to 5 mm.

3. Further, the diameter of the positive hole (6) is 0.6 mm to 1.5 mm, and the distance between the center of the positive hole (6) and the lowest point of the slope of the cylindrical chamfered body (4) is 1 mm to 5 mm.

4. Further, the diameter of the cylinder (3) of the probe head (1) is 3.7 mm to 6 mm.

5. Further, for the cylindrical chamfered body (4) part of the probe head (1), the included angle between the slope and the axis of the cylinder (3) of the probe head (1) is 20° to 54°.

6. Further, the cylinder (3) of the probe head (1) is 10 mm to 40 mm long.

7. Further, the probe support rod (2) is a cylinder with a circular pipe inside, and the two dynamic pressure sensor cables (7) packaged in the probe head (1) pass through the probe support rod (2 ) leads to the probe tail.

The beneficial effects of the present invention are:

The present invention can measure the circumferential distribution of three-dimensional flow parameters such as pitch angle, deflection angle, total pressure, static pressure and Mach number from the pressure surface to the suction surface in the subsonic three-dimensional flow field at the outlet of the rotor after being calibrated by the wind tunnel. Improve the performance of the rotor to provide a basis for measured data. Compared with the porous dynamic pressure probe for measuring subsonic three-dimensional flow field, two dynamic pressure sensors are installed in the head, which has the advantages of simple structure, small size and low cost.

Description of drawings

Fig. 1 is a schematic structural view of a cylindrical dual-hole dynamic pressure probe for measuring subsonic three-dimensional flow at the outlet of a rotor in an embodiment of the present invention.

Fig. 2 is a left side view of Fig. 1 .

Fig. 3 is a view along the direction A of Fig. 2 .

Among them: 1-probe head, 2-probe support rod, 3-cylinder, 4-cylindrical chamfered body, 5-oblique hole, 6-positive hole, 7-cable.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, this embodiment introduces a cylindrical dual-hole dynamic pressure probe for measuring subsonic three-dimensional flow at the rotor outlet, including a probe head (1), a support rod (2), and a probe head (1) It includes a cylinder (3) with a common bottom surface and a cylindrical chamfer (4), which independently encapsulates two dynamic pressure sensors inside; on the inclined surface of the cylindrical chamfer (4) of the probe head (1) , there is a pressure sensing hole, which is an inclined hole (5), and the inclined hole (5) is only connected with a packaged dynamic pressure sensor; on the same side of the inclined plane of the probe head (1) cylindrical chamfered body (4), There is another pressure sensing hole on the side of the cylinder (3) directly below, which is a positive hole (6), and the positive hole (6) is only communicated with another dynamic pressure sensor packaged; the center line of the oblique hole (5), The center line of the positive hole (6) is on the same plane as the axis of the cylinder (3) of the probe head (1); ) axes coincide.

The diameter of the oblique hole (5) is 0.6 millimeters, and the distance between the center of the oblique hole (5) and the lowest point of the oblique surface of the cylindrical oblique body (4) is 2.8 millimeters.

The diameter of the positive hole (6) is 0.6 millimeters, and the distance between the center of the positive hole (6) and the lowest point of the slope of the cylindrical chamfered body (4) is 1 millimeter.

The cylinder (3) of the probe head (1) has a diameter of 4 mm.

In the part of the cylindrical chamfered body (4) of the probe head (1), the included angle between the slope and the axis of the cylinder (3) of the probe head (1) is 45°.

The cylinder (3) of the probe head (1) is 26 mm long.

The probe support rod (2) is a cylinder with a diameter of 6 mm, and a circular channel with a diameter of 4 mm is opened inside it. The two dynamic pressure sensor cables (7) packaged in the probe head (1) pass through the probe The pipe in the support rod (2) leads to the tail of the probe.

The cylindrical dual-hole dynamic pressure probe introduced in the embodiment of the present invention for measuring the subsonic three-dimensional flow at the rotor outlet can obtain calibration data after calibration in a subsonic calibration wind tunnel. When actually measuring the subsonic three-dimensional flow field at the outlet of the rotor, the cylindrical double-hole dynamic pressure probe rotates around the axis of the probe rod, and places several different angular positions for measurement respectively. The two dynamic pressure sensors installed in the probe Several sets of unsteady pressure data have been measured, and the obtained subsonic calibration wind tunnel calibration data can be used for data processing to obtain the pitch angle, deflection angle, total pressure, static pressure and Mach number in the subsonic three-dimensional flow field at the rotor outlet. Circumferential distribution of three-dimensional flow parameters from the pressure side to the suction side.

Claims (7)

1. it is a kind of measure rotor outlet subsonics three-dimensional flow cylindrical type diplopore dynamic pressure probe, it is characterised in that：Including probe Head (1), pole (2), cylinder (3) of the end of probe (1) including common bottom surface, cylinder chamfer body (4), its internal independence 2 dynamic pressure transducers of encapsulation；On the inclined-plane of cylinder beveling body (4) of end of probe (1), a pressure experience is provided with Hole, is inclined hole (5), and a dynamic pressure transducer of the inclined hole (5) only with encapsulation is connected；Body is chamfer in end of probe (1) cylinder (4) the same side on inclined-plane, another pressure experience hole is provided with cylinder (3) side of underface, is positive hole (6), positive hole (6) Only another dynamic pressure transducer with encapsulation is connected；The center line of inclined hole (5), the center line and end of probe of positive hole (6) (1) cylinder (3) axis is in approximately the same plane；Cylinder (3) axis of end of probe (1) and probe pole (2) axis Overlap.

2. it is according to claim 1 it is a kind of measure rotor outlet subsonics three-dimensional flow cylindrical type diplopore dynamic pressure probe, It is characterized in that：A diameter of 0.6 millimeter to 1.5 millimeters of inclined hole (5), inclined hole (5) center of circle is minimum with cylinder beveling body (4) inclined-plane The distance of point is 1 millimeter to 5 millimeters.

3. it is according to claim 1 it is a kind of measure rotor outlet subsonics three-dimensional flow cylindrical type diplopore dynamic pressure probe, It is characterized in that：A diameter of 0.6 millimeter to 1.5 millimeters of positive hole (6), positive hole (6) center of circle is minimum with cylinder beveling body (4) inclined-plane The distance of point is 1 millimeter to 5 millimeters.

4. it is according to claim 1 it is a kind of measure rotor outlet subsonics three-dimensional flow cylindrical type diplopore dynamic pressure probe, It is characterized in that：A diameter of 3.7 millimeters to 6 millimeters of the cylinder (3) of end of probe (1).

5. it is according to claim 1 it is a kind of measure rotor outlet subsonics three-dimensional flow cylindrical type diplopore dynamic pressure probe, It is characterized in that：Cylinder beveling body (4) part of end of probe (1), inclined-plane and cylinder (3) axis of end of probe (1) Angle is 20 ° to 54 °.

6. it is according to claim 1 it is a kind of measure rotor outlet subsonics three-dimensional flow cylindrical type diplopore dynamic pressure probe, It is characterized in that：The cylinder (3) of end of probe (1) is long 10 millimeters to 40 millimeters.

7. it is according to claim 1 it is a kind of measure rotor outlet subsonics three-dimensional flow cylindrical type diplopore dynamic pressure probe, It is characterized in that：Described probe pole (2) is cylinder, and 2 of encapsulation in round pipeline, end of probe (1) are provided with inside it Individual dynamic pressure transducer cable (7) draws probe tails by the pipeline in probe pole (2).