CN119223486A - A fiber optic total temperature probe - Google Patents
A fiber optic total temperature probe Download PDFInfo
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- CN119223486A CN119223486A CN202411647741.9A CN202411647741A CN119223486A CN 119223486 A CN119223486 A CN 119223486A CN 202411647741 A CN202411647741 A CN 202411647741A CN 119223486 A CN119223486 A CN 119223486A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
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- General Physics & Mathematics (AREA)
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Abstract
The application belongs to the technical field of design of optical fiber total temperature probes, and particularly relates to an optical fiber total temperature probe, which is characterized in that high-temperature-resistant sapphire optical fibers are used for collecting optical signals under a high-temperature condition and in a limited volume, blackbody radiation energy can be effectively collected and transmitted to a low-temperature area for detection, the inner wall of a probe protection tube radiates the optical signals, the sapphire optical fibers for receiving the optical signals are arranged at a position with relatively low temperature at the rear end of the probe, the blackbody radiation signals of the probe protection tube are received in a non-contact manner, the sapphire optical fibers can be prevented from being in direct contact with a highest temperature area, the upper limit of temperature measurement can be improved, in addition, in the optical fiber total temperature probe structure, the radiation optical signals are provided with fixed radiation sources and are transmitted in a closed cavity, and measurement errors caused by environmental interference and emissivity offset of an object to be measured in radiation temperature measurement can be effectively avoided.
Description
Technical Field
The application belongs to the technical field of optical fiber total temperature probe design, and particularly relates to an optical fiber total temperature probe.
Background
The most mainstream measurement method for measuring the temperature parameters of the aero-engine is to use a thermocouple and form a total temperature sensor by matching with a stagnation structure. With the development of technology, the temperature of the gas at the outlet of the combustion chamber of the front aero-engine reaches more than 1800 ℃, and the measurement difficulty of the total temperature is greatly increased under the severe environment.
The metal thermocouple is used as a total temperature measuring probe of the temperature sensing element, the total temperature of the fuel gas is measured by directly contacting the fuel gas, the thermocouple wire of the thermocouple is easy to oxidize and fail under the high temperature condition, the measuring precision is reduced, the reliability is poor, meanwhile, the weak potential signal is generated during the temperature measurement of the thermocouple, the electromagnetic interference resistance is poor, and the testing requirement of the total temperature of the high-temperature fuel gas at the outlet of the combustion chamber of the aeroengine is difficult to well meet.
The special optical fiber sensor based on the sapphire optical fiber is widely regarded as an ultrahigh temperature working condition sensor solution because the special optical fiber sensor does not relate to the advantages of electrical characteristics, stable optical performance of a material under a high temperature working condition, good long-term temperature resistance, high stability and the like.
At present, a high-temperature sapphire optical fiber sensor is generally formed by sputtering a platinum coating film on the end part of a bare optical fiber rod to form a cylindrical black body cavity to sense the temperature of fuel gas, the end part of the optical fiber sensor is exposed in high-temperature fuel gas, blackbody radiation light reflecting the temperature of the fuel gas is repeatedly and totally reflected on the inner surface of the sapphire rod, and the blackbody radiation light is transmitted to a rear-end detector through an optical cable to be converted into a temperature indication value.
The total temperature of the outlet of the combustion chamber of the aeroengine is measured by the current sapphire black body cavity type optical fiber sensor, the temperature measurement upper limit is not high due to the limitation of 2045 ℃ of the melting point of the sapphire rod, meanwhile, the temperature sensing end is directly exposed to the high-temperature gas environment of the combustion chamber part, the radiation environment is greatly disturbed, the change of the emissivity of the black body cavity is easily caused by the soot pollution of the gas environment, and the total temperature measurement error is large.
The current sapphire black body cavity type optical fiber sensor is mainly used for direct contact measurement perpendicular to high-temperature gas flow when measuring, a sapphire rod is directly exposed to the high-temperature gas environment, and under the condition of higher gas flow rate, the temperature recovery coefficient of temperature measurement is lower, so that the temperature measurement speed error is larger. And because of the existence of heat radiation and heat exchange between the low-temperature wall surface of the surrounding environment and the sensor probe, the radiation error is larger. The temperature sensing end of the sensor can also generate larger heat conduction errors due to the non-uniformity of the temperature field at the outlet of the combustion chamber component and the influence of the root cooling effect of the supporting structure of the optical fiber sensor.
In addition, when the total temperature probe of the prior aero-engine is used for measuring the total temperature of the outlet of the combustion chamber, ceramic-based materials are adopted as supporting rod bearing parts of the probe, the ceramic-based materials always bear the scouring of high-temperature and high-speed fuel gas flow in the flow passage of the engine in the test, meanwhile, the rotating blades nearby can apply alternating load to the ceramic-based materials, the ceramic-based materials are poor in toughness and thermal shock resistance, the reliability of the ceramic-based supporting rods is low, the root parts are easy to break and lose efficacy in the processing and using processes, and the safety of the aero-engine test is threatened.
The current total temperature measurement probe internal sensor is mostly of a fixed packaging structure, the temperature sensing element and the supporting structure are fixed together by pouring high-temperature glue or cement into the sensor, a sealing effect is achieved, high-temperature fuel gas in a flow channel is prevented from leaking to a rear end lead packaging part to cause ablation damage, but the fixed and sealing structure can lead to the temperature sensing element to be detached and replaced difficultly, the maintenance and the maintenance of the temperature probe are not facilitated, meanwhile, the high-temperature glue and the cement can age after being used for a long time, the sealing effect is reduced and even fails, and the rear end lead packaging part of the probe is damaged.
The present application has been made in view of the above-described technical drawbacks.
Disclosure of Invention
It is an object of the present application to provide an optical fiber total temperature probe that overcomes or mitigates at least one of the known technical drawbacks.
The technical scheme of the application is as follows:
An optical fiber total temperature probe comprises an optical fiber total temperature probe, a compression nut, a mounting seat, a ceramic outer support piece and a ceramic inner support piece;
The mounting seat is provided with a mounting hole which penetrates through the mounting seat;
the ceramic outer support piece is hollow, the top end of the root is open, and the front end of the tail is blocked;
The front end of the tail part of the ceramic outer support piece passes through the mounting hole on the mounting seat, and the top end of the root part is positioned in the mounting hole and is contacted with the 45-degree conical surface between the mounting holes in a matched manner;
the side wall of the front end of the tail part of the ceramic outer support piece is provided with an air inlet hole and an air outlet hole, wherein the air inlet hole is close to the end part of the front end of the tail part compared with the air outlet hole;
The ceramic inner support piece is provided with a through inner hole, the ceramic inner support piece is internally provided with a top end which is matched with the ceramic outer support piece through a step structure, a second high-temperature ceramic fiber sealing gasket is arranged at the matched part of the step structure, and the front end of the ceramic inner support piece extends to the front end of the tail front end side wall exhaust hole of the ceramic outer support piece;
the optical fiber total temperature probe comprises an optical fiber connector, a quartz optical fiber, an adapter, an inner pipe fitting, a sapphire optical fiber and a probe protection pipe;
The probe protection pipe is plugged at the front end, penetrates through the inner hole of the ceramic inner support piece and stretches into the front end of the tail part of the ceramic outer support piece;
the front end of the sapphire optical fiber stretches into the probe protecting tube;
the inner pipe is fixed between the probe protection pipe and the sapphire optical fiber through high-temperature glue;
The adapter seat is connected to the top end of the probe protection tube;
The inner part of the adapter seat is provided with an adapter hole, the outer wall is provided with an annular boss, the front end of the adapter seat extends into the inner hole of the ceramic inner support piece and is matched with the inner hole of the ceramic inner support piece through a step structure, and a first high-temperature ceramic fiber sealing gasket is arranged at the matched part of the step structure;
the rear end of the sapphire optical fiber stretches into the switching hole;
The front end of the quartz optical fiber stretches into the switching hole and is connected with the rear end of the sapphire optical fiber;
the optical fiber connector is connected to the rear end of the quartz optical fiber;
The compression screw cap is sleeved on the periphery of the adapter seat, is in threaded connection with the mounting hole of the mounting seat, is compressed on the annular boss, is matched with the annular boss through a step structure, and is provided with a sealing gasket at the matched position of the step structure.
According to at least one embodiment of the present application, in the above-mentioned optical fiber total temperature probe, a threaded hole is formed on a side wall of the mounting seat, for mounting a locking screw;
The side wall of the top end of the root of the ceramic outer support piece is provided with a locking opening, and a locking screw is inserted into the locking opening.
According to at least one embodiment of the present application, in the optical fiber total temperature probe, the whole mounting seat is made of a superalloy material;
the outer wall of the mounting seat is provided with a mounting edge which can be mounted on the casing through bolts;
The mounting seat is sleeved with a mounting gasket, the mounting gasket is made of a relatively soft metal material and is positioned between the mounting edge and the casing.
According to at least one embodiment of the application, in the optical fiber total temperature probe, the ceramic outer support piece and the ceramic inner support piece are in compression connection by adopting high-temperature resistant ceramic fibers;
The air inlet and the air outlet on the ceramic outer support piece are round, and the orifice of the air inlet adopts 45 DEG
Chamfering.
According to at least one embodiment of the present application, in the above-mentioned optical fiber total temperature probe, the ceramic outer support member is reinforced near the root of the mounting seat, and transits to the position of the exhaust hole on the side wall of the front end of the tail portion according to a certain taper angle.
In accordance with at least one embodiment of the present application, in the optical fiber total temperature probe described above, the probe protection tube is made of metallic iridium;
the ratio of the length of the part of the probe protection tube extending into the front end of the tail part of the ceramic outer support piece to the diameter is more than 10.
According to at least one embodiment of the present application, in the optical fiber total temperature probe, the inner tube is a ceramic tube.
According to at least one embodiment of the present application, in the optical fiber total temperature probe, the adaptor is connected to the top end of the probe protection tube by bonding or welding.
According to at least one embodiment of the present application, in the optical fiber total temperature probe, the front end of the quartz optical fiber and the rear end of the sapphire optical fiber are welded in the adapting hole, and the welded part is protected by sealing.
According to at least one embodiment of the present application, in the optical fiber total temperature probe, a high temperature spring washer is sleeved on the periphery of the adapter seat;
The high temperature spring washer is located between the annular boss and the top end of the ceramic outer support.
The application has at least the following beneficial technical effects:
The utility model provides a total temperature probe of optic fibre with high temperature resistant sapphire optic fibre is carried out optical signal collection under high temperature condition and limited volume, can collect blackbody radiation energy effectively, and transmit to low temperature region with low loss and survey, probe protection tube inner wall can radiate the optical signal, the design is located the relatively lower position of probe rear end temperature with the sapphire optic fibre that receives the optical signal, the blackbody radiation signal of probe protection tube is received in non-contact, can make sapphire optic fibre avoid with the highest temperature district direct contact, can improve the upper limit of temperature measurement, in addition, in this total temperature probe structure of optic fibre, the radiation optical signal has fixed radiation source, and propagate in airtight cavity, can effectively avoid the measuring error that environmental interference and measured object emissivity skew brought in the radiation temperature measurement.
Drawings
FIG. 1 is a schematic diagram of an optical fiber total temperature probe provided by an embodiment of the present application;
FIG. 2 is a schematic view of a mounting base according to an embodiment of the present application;
FIG. 3 is a schematic view of a ceramic outer support provided by an embodiment of the present application;
FIG. 4 is a schematic diagram of an optical fiber total temperature probe provided by an embodiment of the present application;
FIG. 5 is a schematic diagram of a variation rule of a blackbody radiation spectrum with temperature according to an embodiment of the present application;
Wherein:
1-an optical fiber total temperature probe, 2-a compression nut, 3-a sealing gasket, 4-a high-temperature spring gasket, 5-a locking screw, 6-a mounting seat, 7-a mounting gasket, 8-a first high-temperature ceramic fiber sealing gasket, 9-a ceramic outer support, 10-a second high-temperature ceramic fiber sealing gasket and 11-a ceramic inner support;
1-1-optical fiber connector, 1-2-quartz optical fiber, 1-3-adapter, 1-4-inner pipe fitting, 1-5-sapphire optical fiber and 1-6-probe protecting tube.
For the purpose of better illustrating the embodiments, certain elements of the drawings are omitted, enlarged or reduced in size and do not represent the actual product dimensions, and furthermore, the drawings are for illustrative purposes only and are not to be construed as limiting the application.
Detailed Description
In order to make the technical solution of the present application and its advantages more clear, the technical solution of the present application will be further and completely described in detail with reference to the accompanying drawings, it being understood that the specific embodiments described herein are only some of the embodiments of the present application, which are for explanation of the present application and not for limitation of the present application. It should be noted that, for convenience of description, only a portion related to the present application is shown in the drawings, and other related portions may refer to a general design.
Furthermore, unless defined otherwise, technical or scientific terms used in the description of the application should be given the ordinary meaning as understood by one of ordinary skill in the art to which the application pertains. The words used in the description of the present application to indicate directions are merely used to indicate relative directions or positional relationships, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed accordingly. As used in this description of the application, the word "comprising" or "comprises" does not exclude the presence of other elements or items listed after the word, and the like.
It should be further noted that, unless explicitly stated or limited otherwise, terms such as "mounted," "connected," and the like, used in the description of the present application should be construed broadly, and may be, for example, fixedly connected, detachably connected, mechanically connected, electrically connected, directly connected, or indirectly connected through an intermediate medium, as would be understood by one skilled in the art to have the specific meaning of the present application in the present application.
An optical fiber total temperature probe, as shown in fig. 1, comprises an optical fiber total temperature probe 1, a compression nut 2, a sealing gasket 3, a high-temperature spring gasket 4, a locking screw 5, a mounting seat 6, a mounting gasket 7, a first high-temperature ceramic fiber sealing gasket 8, a ceramic outer support 9, a second high-temperature ceramic fiber sealing gasket 10 and a ceramic inner support 11.
The mount 6 is integrally made of a superalloy material, and has a mounting hole therethrough as shown in fig. 2. The side wall of the mounting seat 6 is provided with a threaded hole for mounting the locking screw 5.
The outer wall of the mounting seat 6 is provided with a mounting edge, and the mounting seat can be mounted on the casing through bolts.
The mounting gasket 7 is made of a relatively soft metal material, is sleeved on the periphery of the mounting seat 6 and is positioned between the mounting edge and the casing, and can play a role in vibration reduction and sealing.
The ceramic outer support piece 9 and the ceramic inner support piece 11 are combined into a double-layer bearing support rod, so that the double-layer bearing support rod can bear the scouring of high-temperature fuel gas in the inner flow passage of the casing, and the ceramic outer support piece 9 and the ceramic inner support piece 11 are designed to be in compression connection by adopting high-temperature resistant ceramic fibers.
The ceramic outer support 9 is as shown in fig. 3, and is integrally of a conical structure, hollow in the inside and blocked at the front end of the root and the top end of the tail. The front end of the tail part of the ceramic outer support piece 9 passes through the mounting hole on the mounting seat 6 and stretches into the casing to be contacted with high-temperature fuel gas, and the top end of the root part is positioned in the mounting hole to be contacted with the 45-degree conical surface between the mounting holes in a matched manner.
Front of tail part of ceramic outer support piece 9 the side wall of the end is provided with an air inlet hole the air exhaust hole is arranged on the inner side of the air exhaust hole, wherein, the air inlet hole is close to the front end of the tail part compared with the air outlet hole. The air inlet and the air outlet are round, Thereby ensuring that the flow rate of the high-temperature fuel gas entering the ceramic outer support 9 from the air inlet holes is reduced below M0.2. The air inlet hole opening adopts a 45-degree chamfer, so that the insensitive angle range of temperature test can be enlarged, and the temperature measurement accuracy is improved.
The ceramic outer support piece 9 is close to the root of the mounting seat 6 for reinforcement design, and is transited to the exhaust hole position of the side wall of the front end of the tail part according to a certain cone angle, and is close to the center part of the inner flow passage of the casing.
The lateral wall of the root top end of the ceramic outer support piece 9 is provided with a locking port, and the locking screw 5 is inserted into the locking port, so that the ceramic outer support piece 9 is locked and limited, and the ceramic outer support piece 9 is prevented from circumferential rotation and axial movement in the use process.
The ceramic inner support piece 11 is provided with an inner hole penetrating through, is arranged in the ceramic outer support piece 9, the top end of the ceramic inner support piece is matched with the ceramic outer support piece 9 through a step structure, a second high-temperature ceramic fiber sealing gasket 10 is arranged at the matched position of the step structure, and the front end of the ceramic inner support piece extends to the front end side wall exhaust hole of the tail part of the ceramic outer support piece 9.
As shown in FIG. 4, the optical fiber total temperature probe 1 mainly comprises an optical fiber connector 1-1, a quartz optical fiber 1-2, an adapter 1-3, an inner pipe fitting 1-4, a sapphire optical fiber 1-5 and a probe protection tube 1-6.
The probe protecting tube 1-6 is plugged at the front end, penetrates through the inner hole of the ceramic inner supporting piece 11 and stretches into the front end of the tail part of the ceramic outer supporting piece 9. The ratio of the length of the part of the probe protection tube 1-6 extending into the front end of the tail part of the ceramic outer support piece 9 to the diameter is larger than 10.
The probe protection tube 1-6 is made of iridium metal and can be in direct contact with high-temperature fuel gas. The high-temperature fuel gas entering the front end of the tail part of the ceramic outer support piece 9 is stagnated at the front end of the probe protection tube 1-6, at this time, the temperature of the front end of the probe protection tube 1-6 is the stagnation total temperature of the high-temperature fuel gas, and the inside of the front end of the probe protection tube 1-6 can emit a blackbody radiation signal at the corresponding temperature, and the blackbody radiation signal is not interfered by the external high-temperature fuel gas environment.
The front end of the sapphire optical fiber 1-5 stretches into the probe protection tube 1-6 and can receive blackbody radiation signals.
The inner pipe fitting 1-4 is a ceramic pipe and is fixed between the probe protection pipe 1-6 and the sapphire optical fiber 1-5 through high-temperature glue, so that the sapphire optical fiber 1-5 is supported and limited, and the stability of the sapphire optical fiber 1-5 when receiving blackbody radiation signals is ensured.
The adapter 1-3 is connected to the top end of the probe protection tube 1-6 in an adhesive or welding mode and is used for installing and fixing the optical fiber total temperature probe 1. The adapter 1-3 is internally provided with an adapter hole, the outer wall is provided with an annular boss, the front end of the adapter is extended into the inner hole of the ceramic inner support piece 11 and is matched with the inner hole of the ceramic inner support piece 11 through a step structure, and a first high-temperature ceramic fiber sealing gasket 8 is arranged at the matched position of the step structure. The rear ends of the sapphire optical fibers 1-5 extend into the switching holes.
The front end of the quartz optical fiber 1-2 stretches into the switching hole and is welded with the rear end of the sapphire optical fiber 1-5, and the welded part is protected by sealing. The blackbody radiation signal received by the front end of the sapphire optical fiber 1-5 can be transmitted to the quartz optical fiber 1-2 in the low-temperature area at the rear end, and the two optical fibers are coupled in a fusion mode and the like.
The optical fiber connector 1-1 is connected to the rear end of the quartz optical fiber 1-2.
The compression nut 2 is sleeved on the periphery of the adapter seat 1-3, is in threaded connection with the mounting hole of the mounting seat 6, is compressed on the annular boss and is matched with the annular boss through a step structure, and a sealing gasket 3 is arranged at the matched position of the step structure.
The high-temperature spring washer 4 is sleeved on the periphery of the adapter seat 1-3 and is positioned between the annular boss and the top end of the ceramic outer supporting piece 9, so that the buffering and vibration reduction effects can be achieved when the compression nut 2 compresses the optical fiber total temperature probe 1, and meanwhile, the thread pretightening force of the compression nut 2 can be adjusted, so that the compression nut 2 is prevented from being loosened due to vibration in the use process.
In the optical fiber total temperature probe disclosed in the above embodiment, four movable sealing structures are designed, which are respectively 45-degree conical surface matched seals between the ceramic outer support 9 and the mounting seat 6, the ceramic inner support 11 and the optical fiber total temperature probe 1 are sealed by adding a first high-temperature ceramic fiber sealing gasket 8, the ceramic inner support 11 and the ceramic outer support 9 are sealed by adding a second high-temperature ceramic fiber sealing gasket 10, the optical fiber total temperature probe 1 and the compression nut 2 are sealed by adding a sealing gasket 3, after the compression nut 2 is screwed up, the four movable sealing structures can be compressed by force, so that high-temperature gas can not leak, and meanwhile, the four movable sealing structures are arranged, so that the optical fiber total temperature probe 1 is convenient to replace.
The key temperature sensing component of the optical fiber total temperature probe 1 is required to be reliably fixed when in use. When the compression nut is screwed down 2, a compression force is applied to the optical fiber total temperature probe 1, the optical fiber total temperature probe 1 transmits the compression force to the ceramic inner support piece 11 and the ceramic outer support piece 9, so that all components in the optical fiber total temperature probe are reliably connected with the mounting seat 6, the optical fiber total temperature probe 1 is reliably fixed, and the fixing structure can support flexible replacement of the optical fiber total temperature probe 1, and is higher in reliability and economy.
When the optical fiber total temperature probe disclosed by the embodiment is used for measuring the total temperature of the outlet of the combustion chamber of the aeroengine, the installation edge on the installation seat 6 can be connected to the casing by bolts for fixing, the front ends of the installation seat 6 and the ceramic outer support piece 9 thereof extend into the flow channel through the measuring holes formed in the casing, high-temperature fuel gas can enter from the windward side from the air inlet hole on the ceramic outer support piece 9, stagnates at the front end of the optical fiber total temperature probe 1, and is discharged from the exhaust hole on the leeward side of the ceramic outer support piece 9, wherein the front end temperature of the optical fiber total temperature probe 1 is the stagnation temperature of high-temperature fuel gas, namely the total temperature of the high-temperature fuel gas of the outlet of the combustion chamber of the aeroengine.
Aeroengine internal flow temperature measurements are generally referred to as internal flow total temperature measurements. The total temperature T of the air flow consists of a static temperature T and a dynamic temperature Tv, wherein the static temperature T is the kinetic energy of the free movement of gas molecules, and the dynamic temperature Tv is the kinetic energy of the directional movement of the gas molecules. In order to enable the surface temperature of the sensor to be closer to the total temperature of the air flow, the total temperature probe is provided with a stagnation structure, the air flow can be subjected to double stagnation effects of a stagnation cavity and the end face of the sensor, the flow speed is greatly reduced, the kinetic energy of the air flow can be converted into heat energy, the temperature of the air flow in the total temperature probe is increased, and the temperature of the top end of the sensor is the total temperature of the air flow under the condition of neglecting heat dissipation.
It is known from the radiation principle that all objects with temperature continuously emit thermal radiation to the outside and are represented in the form of electromagnetic waves. According to the Planck formula, the radiation energy of a specific wavelength interval of a specific wavelength emitted by a black body of a unit area to all directions of a hemispherical space in unit time is as followsWherein lambda is the radiation wavelength of the object, T is the absolute temperature of the object, and C 1＝3.7418×10－16Wm2、C2＝1.4388×10－2 mk is the first and second radiation constants, respectively.
The variation law of the blackbody radiation spectrum with temperature is shown in fig. 5. It can be seen that the blackbody radiation energy characteristics over a band of wavelengths are temperature modulated. The above characteristics apply equally to real objects. Based on this characteristic, the corresponding temperature information can be obtained by measuring the characteristic signal of the radiant energy of the target object.
The optical fiber total temperature probe disclosed by the embodiment is used for collecting optical signals under the high temperature condition and in a limited volume by using the high temperature resistant sapphire optical fibers 1-5, so that blackbody radiation energy can be effectively collected and transmitted to a low temperature area for detection with low loss. The inner wall of the probe protection tube 1-6 can radiate optical signals, the sapphire optical fiber 1-5 for receiving the optical signals is designed to be positioned at a position with relatively low temperature at the rear end of the probe, the blackbody radiation signals of the probe protection tube 1-6 are received in a non-contact manner, the sapphire optical fiber 1-5 can be prevented from being in direct contact with the highest temperature area, and the upper limit of temperature measurement can be improved. In addition, in the optical fiber total temperature probe structure disclosed in the embodiment, the radiation optical signal has a fixed radiation source and propagates in the closed cavity, so that the measurement errors caused by environmental interference and the emissivity deviation of the object to be measured in the radiation temperature measurement can be effectively avoided.
In the optical fiber total temperature probe disclosed in the above embodiment, the ceramic outer support member 9 is designed on the side wall of the front end of the tail partThe temperature measuring device can reduce the flow rate of high-temperature fuel gas entering the front end of the tail part of the ceramic outer support piece 9 to below M0.2, can effectively reduce the temperature measuring speed error of the optical fiber total temperature probe 1, can effectively shield the radiation interference of the low-temperature wall of the surrounding environment to the optical fiber total temperature probe 1 in the ceramic outer support piece 9, reduces the temperature difference between the optical fiber total temperature probe 1 and the wall surface of the optical fiber total temperature probe, can reduce the temperature measuring error caused by radiation heat exchange, and in addition, the optical fiber total temperature probe 1 is parallel to the gas flowing direction in a shielding cavity formed at the front end of the tail part of the ceramic outer support piece 9, the ratio of the length to the diameter of the optical fiber total temperature probe 1 in the shielding cavity is larger than 10 according to the infinite pivot heat conduction principle, the convection heat exchange area and the heat conduction thermal resistance of the optical fiber total temperature probe 1 in the shielding cavity are increased, and the temperature of the optical fiber total temperature probe 1 in the shielding cavity can be uniformly heated by the high-temperature fuel gas, and the temperature of the inner support base is more nearly consistent with the temperature of the temperature sensing area at the front end of the probe, so that the heat conduction error can be reduced.
The optical fiber total temperature probe disclosed by the embodiment is applied to total temperature measurement of an aeroengine combustion chamber outlet, so that speed errors, radiation errors and heat conduction errors can be effectively restrained, and the influence of the errors of the three aspects on the total temperature measurement accuracy is reduced.
In the optical fiber total temperature probe disclosed in the embodiment, the sapphire optical fiber 1-5 in the optical fiber total temperature probe 1 receives the heat radiation energy of the contact part of the probe and the high-temperature fuel gas, so as to demodulate the fuel gas stagnation temperature, and the high-temperature high-speed fuel gas total temperature at the outlet of the combustion chamber of the aeroengine can be measured in a contact mode, so that the problems of easiness in environmental interference, poor reliability and low precision existing in the existing temperature measuring method can be solved, and the problems of measuring errors and the like caused by the emissivity deviation of an object to be measured in the traditional radiation temperature measurement can be effectively avoided.
In the optical fiber total temperature probe disclosed in the embodiment, the shielding cavity formed by the front end of the tail part of the ceramic outer support piece 9 can shield the radiation interference of the low-temperature wall surface of the surrounding environment, reduce the temperature measurement error caused by radiation heat exchange, and reduce the high-temperature gas flow rate of the temperature sensing end of the optical fiber total temperature probe 1 by designing the area of the air inlet and outlet holes, and the optical fiber total temperature probe 1 is parallel to the high-temperature gas flow direction in the shielding cavity, the optical fiber total temperature probe 1 can be uniformly heated by gas in the shielding cavity, the surface temperature is close to be consistent, the root cooling effect influence of the supporting structure of the optical fiber total temperature probe 1 can be reduced, and the heat conduction error is reduced.
In the optical fiber total temperature probe disclosed in the embodiment, the ceramic outer support piece 9 and the ceramic inner support piece 11 are combined into the double-layer bearing support rod to form the double-layer composite ceramic support structure, the inner support rod and the outer support rod are in compression connection by adopting the high-temperature resistant ceramic fiber, so that the impact load of high-temperature gas flow and the alternating load applied by the rotating blade can be reduced, the rigidity and the vibration resistance of the support structure are improved, and the inner support rod and the outer support rod and the sealing piece under the structure can be independently replaced if damaged, so that the economical efficiency is good.
In the optical fiber total temperature probe disclosed in the embodiment, a reliable internal sealing and fixing structure is designed, so that high-temperature fuel gas can be prevented from leaking, the tail packaging part of the probe is prevented from being ablated, and meanwhile, the structure can ensure that the optical fiber total temperature probe 1 in the probe is reliably fixed and flexibly replaced, and the reliability and the economy are high.
Having thus described the technical aspects of the present application with reference to the preferred embodiments shown in the drawings, it should be understood by those skilled in the art that the scope of the present application is not limited to the specific embodiments, and those skilled in the art may make equivalent changes or substitutions to the related technical features without departing from the principle of the present application, and those changes or substitutions will fall within the scope of the present application.
Claims (10)
1. The optical fiber total temperature probe is characterized by comprising an optical fiber total temperature probe (1), a compression nut (2), a mounting seat (6), a ceramic outer support (9) and a ceramic inner support (11);
The mounting seat (6) is provided with a mounting hole penetrating through;
the ceramic outer support (9) is hollow, and the top end opening of the root and the front end of the tail are blocked;
The front end of the tail part of the ceramic outer support piece (9) passes through the mounting hole on the mounting seat (6), and the top end of the root part is positioned in the mounting hole and contacted with the 45-degree conical surface between the mounting holes in a matched manner;
The side wall of the front end of the tail part of the ceramic outer support piece (9) is provided with an air inlet hole and an air outlet hole, wherein the air inlet hole is close to the end part of the front end of the tail part compared with the air outlet hole;
The ceramic inner support (11) is provided with an inner hole penetrating through the ceramic inner support (9), the top end of the ceramic inner support is matched with the ceramic outer support (9) through a step structure, a second high-temperature ceramic fiber sealing gasket (10) is arranged at the matched part of the step structure, and the front end of the ceramic inner support extends to the front end side wall exhaust hole of the tail part of the ceramic outer support (9);
The optical fiber total temperature probe (1) comprises an optical fiber connector (1-1), a quartz optical fiber (1-2), an adapter seat (1-3), an inner pipe (1-4), a sapphire optical fiber (1-5) and a probe protection pipe (1-6);
The probe protection tube (1-6) is plugged at the front end, penetrates through the inner hole of the ceramic inner support (11) and stretches into the front end of the tail part of the ceramic outer support (9);
The front end of the sapphire optical fiber (1-5) stretches into the probe protection tube (1-6);
The inner pipe fitting (1-4) is fixedly adhered between the probe protecting pipe (1-6) and the sapphire optical fiber (1-5) through high-temperature glue;
The adapter (1-3) is connected to the top end of the probe protection tube (1-6);
the inside of the adapter seat (1-3) is provided with an adapter hole, the outer wall is provided with an annular boss, the front end of the adapter seat extends into the inner hole of the ceramic inner support piece (11) and is matched with the inner hole of the ceramic inner support piece (11) through a step structure, and a first high-temperature ceramic fiber sealing gasket (8) is arranged at the matched part of the step structure;
the rear end of the sapphire optical fiber (1-5) extends into the switching hole;
The front end of the quartz optical fiber (1-2) extends into the switching hole and is connected with the rear end of the sapphire optical fiber (1-5);
The optical fiber connector (1-1) is connected to the rear end of the quartz optical fiber (1-2);
The compression nut (2) is sleeved on the periphery of the adapter seat (1-3), is in threaded connection with the mounting hole of the mounting seat (6), is compressed on the annular boss and is matched with the annular boss through a step structure, and a sealing gasket (3) is arranged at the matched position of the step structure.
2. The total temperature probe of claim 1, wherein the total temperature probe comprises a plurality of probes,
The side wall of the mounting seat (6) is provided with a threaded hole for mounting the locking screw (5);
The side wall of the root top end of the ceramic outer support piece (9) is provided with a locking port, and the locking screw (5) is inserted into the locking port.
3. The total temperature probe of claim 2, wherein the total temperature probe comprises a plurality of probes,
The whole mounting seat (6) is made of high-temperature alloy materials;
The outer wall of the mounting seat (6) is provided with a mounting edge which can be mounted on the casing through bolts;
the mounting seat (6) is sleeved with a mounting gasket (7), the mounting gasket (7) is made of a relatively soft metal material, and the mounting gasket is positioned between the mounting edge and the casing.
4. The optical fiber total temperature probe according to claim 3, wherein,
The ceramic outer support piece (9) and the ceramic inner support piece (11) are in compaction connection by adopting high-temperature-resistant ceramic fibers;
The air inlet and the air outlet on the ceramic outer support piece (9) are round, and the openings of the air inlet are chamfered at 45 degrees.
5. The optical fiber total temperature probe according to claim 4, wherein,
The ceramic outer support piece (9) is close to the root of the mounting seat (6) for reinforcement design, and is transited to the exhaust hole position of the side wall of the front end of the tail part according to a certain cone angle.
6. The optical fiber total temperature probe according to claim 5, wherein,
The probe protecting tube (1-6) is made of metallic iridium;
The ratio of the length to the diameter of the part of the probe protection tube (1-6) extending into the front end of the tail part of the ceramic outer support piece (9) is more than 10.
7. The optical fiber total temperature probe according to claim 6, wherein,
The inner pipe fitting (1-4) is a ceramic pipe.
8. The fiber optic total temperature probe of claim 7, wherein,
The adapter (1-3) is connected to the top end of the probe protection tube (1-6) in an adhesive or welding mode.
9. The fiber optic total temperature probe of claim 8, wherein,
The front end of the quartz optical fiber (1-2) and the rear end of the sapphire optical fiber (1-5) are welded in the switching hole, and the welded part is protected by sealing.
10. The fiber optic total temperature probe of claim 9, wherein,
The periphery of the adapter seat (1-3) is sleeved with a high-temperature spring washer (4);
the high-temperature spring washer (4) is positioned between the annular boss and the top end of the ceramic outer support (9).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202411647741.9A CN119223486A (en) | 2024-11-18 | 2024-11-18 | A fiber optic total temperature probe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202411647741.9A CN119223486A (en) | 2024-11-18 | 2024-11-18 | A fiber optic total temperature probe |
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