Double-working-condition high-temperature-resistant total temperature sensing part

Abstract

The invention relates to the technical field of aero-engine high-temperature and high-pressure testing, and particularly discloses a double-working-condition high-temperature-resistant total temperature sensing part which is suitable for a cooling-free working condition and a cooling working condition and comprises a shell, a lead device, a mounting base and a supporting framework. The shell comprises a front test piece and a rear protective sleeve which are formed by integrally weaving a ceramic matrix composite material; the windward side of the front test piece is semi-cylindrical, a temperature taking cavity is formed in the front test piece, an air leakage hole is formed in the outer wall, and a thermocouple is mounted in the temperature taking cavity; the lead device comprises a ceramic tube, a lead tube and a shielding cable accessory; the front test piece and the rear protective sleeve are connected by the support framework through a stepped combined groove, and a bent water cooling pipeline is formed in the support framework; and a cavity between the supporting framework and the front test piece is filled and sealed by high-temperature cement. According to the invention, short-time high-temperature measurement can be realized under a non-cooling condition, and long-time stable total temperature acquisition capability can be obtained under a cooling condition, so that structural reliability and temperature measurement precision in an extreme gas environment are both considered.

Description

Technical Field

[0001] This invention relates to the field of high-temperature and high-pressure testing technology for aero-engines, specifically to a dual-condition high-temperature total temperature sensing element. Background Technology

[0002] In high-performance thermomechanical equipment such as aero-engines and gas turbines, total gas temperature is a key parameter reflecting combustion state, heat load distribution, and turbine component safety margin. Its measurement accuracy directly affects the optimization of combustion control strategies, improvement of overall engine efficiency, and reliability of operational safety monitoring. As aero-engines develop towards higher thrust-to-weight ratios and higher cycle temperatures, the gas temperature in the main combustion zone and turbine inlet has generally exceeded 1600℃, and under certain operating conditions, it can even reach above 1800℃ for short periods. This is accompanied by a megapascal-level high-pressure gas environment, requiring total temperature sensing components to simultaneously meet extremely high requirements for high-temperature resistance, structural strength, and temperature measurement stability in practical applications.

[0003] To achieve continuous measurement of total gas temperature, existing technologies widely employ total temperature sensing elements made of metal-based materials, with internal water-cooled channels to reduce structural temperature and prevent high-temperature failure. While these water-cooled total temperature probes can extend their service life to some extent, their overall structure is highly dependent on the continuous supply of cooling, resulting in limited adaptability to various operating conditions. On one hand, the temperature resistance limit of metal-based materials is inherently limited, making it difficult to meet the demands of next-generation high-temperature gas environments. On the other hand, the thermal coupling between the cooling channels and the temperature sensing structure can easily create localized temperature drops in the measurement area, causing the measurement results to deviate from the true total gas temperature. Furthermore, complex compensation models are required for correction, making it difficult to maintain stable accuracy over long periods in practical applications.

[0004] Furthermore, traditional water-cooled sensing units often employ an integrated or simple plug-in structure. The connection between the front-end temperature sensor, the middle support structure, and the rear-end lead structure is relatively simple. The confined space within the integrated housing increases the difficulty of thermocouple installation. Under high temperature, high pressure, and strong vibration conditions, thermal expansion mismatch, stress concentration, or relative displacement can easily occur at the structural assembly points, not only increasing assembly difficulty but also affecting the long-term reliability of the overall structure. Simultaneously, due to the limited internal space of the sensing unit, the arrangement and fixing methods of the thermocouple and its leads are significantly constrained. If the cooling medium is interrupted even briefly, the sensing unit often cannot continue to operate safely without cooling, posing a risk of rapid failure. Therefore, a new total temperature sensing unit structural design is urgently needed that can achieve stable assembly and installation between the front test piece, support structure, and rear protection structure while maintaining high temperature resistance and high structural strength, and be compatible with both short-term uncooled and long-term water-cooled conditions, while still achieving high-precision and long-life total temperature measurement results in extreme gas environments. Summary of the Invention

[0005] To address the aforementioned deficiencies in existing technologies, this invention provides a dual-condition high-temperature resistant total temperature sensing element that can achieve short-term high-temperature measurement without cooling and obtain long-term stable total temperature acquisition capability under cooling conditions, thereby balancing structural reliability and temperature measurement accuracy in extreme gas environments.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A dual-condition high-temperature resistant total temperature sensing element, suitable for both uncooled and cooled operating conditions, includes a housing, lead wire assembly, mounting base, and support frame; The housing includes a front test piece and a rear protective sleeve, both of which are integrally woven from ceramic matrix composite material; the windward side of the front test piece is semi-cylindrical, with a temperature acquisition cavity inside and a vent hole on the outer wall, and a thermocouple is installed inside the temperature acquisition cavity; The support frame is provided with a stepped combination groove on the side near the front test piece and the rear protective sleeve. The tail of the front test piece and the head of the rear protective sleeve are bent and embedded into the corresponding fitting section of the stepped combination groove, so as to realize the combined installation of the front test piece, the support frame and the rear protective sleeve. The supporting frame has a bent water-cooling pipeline inside, which includes an inlet pipe and an outlet pipe, and is connected to an external water source through an inlet connector and an outlet connector, respectively. The mounting base includes a circumferential boss and a cover plate, and the cover plate and the circumferential boss are sealed by welding; The lead wire device includes a ceramic tube, a lead wire tube, and a shielded cable accessory. The ceramic tube includes a double-hole ceramic tube and a single-hole ceramic tube. The double-hole ceramic tube is installed in the temperature acquisition cavity. The single-hole ceramic tube is respectively sleeved on the two pins of the thermocouple and introduced into the lead wire tube through the cavity between the front test piece and the support frame.

[0007] Preferably, the gaps between the stepped combined groove and the front test piece and the rear protective sleeve, as well as the gap between the front test piece and the rear protective sleeve, are filled with high-temperature sealant.

[0008] Preferably, the cavity between the support frame and the front test piece is filled and sealed with high-temperature cement.

[0009] Preferably, the front end of the lead tube is welded and sealed to the cover plate by a threaded connection, and the tail end of the lead tube is connected to the shielded cable accessory by a thread; a multi-hole wire-passing pressure plate is installed inside the shielded cable accessory, and the thermocouple wire is straightened by the multi-hole wire-passing pressure plate and then connected to the compensating wire through the shielded cable accessory.

[0010] Preferably, the support frame is integrally formed by 3D printing, and the water inlet connector and the water outlet connector are threadedly connected to the cover plate and then welded and sealed.

[0011] Preferably, the temperature sampling cavity inside the front test piece faces the windward side, and the vent holes are symmetrically distributed on both sides of the temperature sampling cavity and are connected to the temperature sampling cavity one by one.

[0012] Preferably, the thermocouple is a type B thermocouple with a second-level precision, in which the non-hot end is covered by a ceramic tube, and the hot end is exposed outside the ceramic tube.

[0013] Preferably, an environmental barrier coating is deposited on the surface of the housing.

[0014] Preferably, under no-cooling conditions, the test piece relies on the high-temperature resistance of the ceramic matrix composite material for short-term temperature measurement; under cooling conditions, it is cooled by the water-cooling pipeline to achieve long-term stable temperature measurement of the total temperature sensing part.

[0015] Preferably, the external cooling water source is regulated based on the total temperature signal output by the thermocouple. When the detected temperature exceeds a preset threshold, the inlet water flow rate of the water-cooled pipeline is increased, and when the temperature decreases, the inlet water flow rate is reduced, so as to achieve dynamic matching between cooling capacity and gas temperature.

[0016] The dual-condition high-temperature resistant total temperature sensing element provided by this invention addresses the problems of large temperature measurement errors, low structural strength, and incompatibility between uncooled and cooled operating conditions in existing technologies for high-temperature gas measurement. Through innovative structural design, it achieves compatibility between short-term uncooled temperature measurement and long-term water-cooled temperature measurement, and has the following beneficial effects: (1) The front test piece and the rear protective sleeve of the present invention are both woven into a whole using ceramic matrix composite material, and an environmental barrier coating can be deposited on the outer surface. Combined with the high temperature cement sealing structure of the support frame and the cavity of the front test piece, the sensing part can withstand the gas scouring of 1200℃~1600℃ for a short time without cooling due to the high temperature resistance of ceramic matrix composite material, effectively solving the problem that traditional metal water-cooled probes are prone to softening, creep or ablation at extremely high temperatures.

[0017] (2) In this invention, the thermocouple is set in the temperature acquisition cavity formed by ceramic matrix composite material. The temperature measurement area and the water cooling system are effectively isolated from each other by the ceramic matrix composite material and the high temperature sealing structure, so that the cooling medium will not directly or indirectly act on the hot end of the thermocouple, thereby avoiding local temperature drop and temperature measurement deviation caused by cooling. This ensures that under cooling conditions, the sensing part can work stably for a long time at 1600℃ while ensuring high-precision temperature measurement, and the maximum operating temperature can reach 1800℃.

[0018] (3) The housing of the present invention is composed of a front test piece and a rear protective sleeve. The front test piece and the rear protective sleeve are used in combination through the stepped groove of the support frame and the housing is pressed circumferentially by the mounting seat. This structure enables the front test piece, the support frame and the rear protective sleeve to form a stable assembly relationship, reducing the assembly difficulty and improving the assembly consistency. On the other hand, the support frame structurally shares the load borne by the front test piece under high temperature and high pressure gas scouring, effectively alleviating the stress concentration problem, improving the overall structural strength and vibration resistance of the sensing part, and significantly enhancing its long-term reliability under extreme working conditions. Attached Figure Description

[0019] Figure 1 This is an overall structural diagram of the dual-condition high-temperature resistant total temperature sensing element of the present invention; Figure 2 This is a front view of the dual-condition high-temperature resistant total temperature sensing part of the present invention; Figure 3 This is a side view of the dual-condition high-temperature resistant total temperature sensing part of the present invention; Figure 4 for Figure 2 AA section view; Figure 5 for Figure 3 BB cross-sectional view.

[0020] Explanation of reference numerals in the attached drawings: 1-Front test piece; 2-Mounting base; 3-Lead tube; 4-Shielded cable accessory; 5-Water cooling pipe; 6-Support frame; 61-Stepped combination groove; 7-Rear protective sleeve; 11-Temperature extraction cavity; 12-Vent hole; 13-Thermocouple; 21-Circumferential boss; 22-Cover plate; 31-Compression nut; 41-Multi-hole wire guide plate; 51-Water inlet pipe; 52-Water outlet pipe; 53-Water inlet connector; 54-Water outlet connector. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention belong to the present invention.

[0022] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0023] like Figure 1-5 As shown, this embodiment discloses a dual-condition high-temperature resistant total temperature sensing element, which is suitable for short-term uncooled conditions and long-term cooling conditions, including a housing, a lead wire device, a mounting base 2 and a support frame 6; The housing includes a front test piece 1 and a rear protective sleeve 7, both of which are integrally woven from ceramic matrix composite material. The windward side of the front test piece 1 is semi-cylindrical, with a temperature sampling cavity 11 inside and a vent hole 12 on the outer wall. A thermocouple 13 is installed inside the temperature sampling cavity 11. The ceramic matrix composite material can maintain its strength and resist thermal shock at temperatures above 1600℃, making it particularly suitable for the front test piece 1 to withstand the long-term impact of high-speed, high-temperature combustion gases.

[0024] The support frame 6 has stepped combination grooves 61 on its sides near the front test piece 1 and the rear protective sleeve 7. The tail of the front test piece and the head of the rear protective sleeve are bent and embedded into the corresponding fitting sections of the stepped combination grooves 61, realizing the combined installation of the front test piece 1, the support frame 6, and the rear protective sleeve 7. Stepped combination grooves 61 are provided on both sides of the support frame 6. Through the limiting structure of the stepped combination grooves 61, the front test piece 1 and the rear protective sleeve 7 can be reliably positioned in the axial and circumferential directions, so that they form a stable integral structure after assembly. This not only improves the consistency and repeatability of assembly, but also helps to distribute the structural load under high temperature, high pressure, and vibration conditions, avoid local stress concentration, and further improve the overall structural stability and long-term reliability of the total temperature sensing part.

[0025] The support frame 6 has a bent water-cooling pipe 5 inside. The water-cooling pipe 5 includes an inlet pipe 51 and an outlet pipe 52, which are connected to an external water source through an inlet connector 53 and an outlet connector 54, respectively. The support frame 6 is made of high-temperature alloy material. The main function of the water-cooling pipe 5 is to cool the support frame and ensure the stability of temperature measurement for a long time in an environment of 1600℃.

[0026] Mounting base 2 includes a circumferential boss 21 and a cover plate 22. The cover plate 22 and the circumferential boss 21 are sealed by welding to ensure good sealing performance. After assembly, mounting base 2 further compresses the housing circumferentially, enabling the front test piece 1, support frame 6, and rear protective sleeve 7 to achieve circumferential positioning and form a stable assembly relationship. This not only limits the relative displacement of each component during operation but also improves the rigidity and sealing reliability of the overall structure, thereby ensuring that the total temperature sensing part maintains good structural stability and operational safety under long-term high temperature, high pressure, and vibration environments. Mounting base 2 and the front test piece 1 are axially fixed by a stepped hole and the cover plate 22.

[0027] The lead wire assembly includes a ceramic tube, a lead wire tube 3, and a shielded cable accessory 4. The ceramic tube includes a double-hole ceramic tube and a single-hole ceramic tube. The double-hole ceramic tube is installed in the temperature sampling chamber of the front test piece 1. The gap between the double-hole ceramic tube and the front test piece 1 is filled with high-temperature resistant cement, which not only further eliminates the risk of loosening but also provides additional thermal buffering capacity. The single-hole ceramic tubes are respectively installed on the two legs of the thermocouple wire and lead the thermocouple wire to the lead wire tube 3 through the cavity between the front test piece and the support frame, ensuring good insulation and heat insulation of the thermocouple wire.

[0028] In one specific embodiment, the front test piece 1 and the rear protective sleeve 7 are made of SiC ceramic matrix composite material. The front test piece 1 and the rear protective sleeve 7 are prepared by the "3D integral woven preform + chemical vapor infiltration (CVI)" process, and an environmental barrier coating is deposited on the surface of the front test piece 1 and the rear protective sleeve 7.

[0029] In this embodiment, the gaps (assembly gaps) formed between the stepped combined groove 61 and the front test piece 1 and the rear protective sleeve 7, as well as the gaps (interlocking gaps) between the front test piece 1 and the rear protective sleeve 7, are filled with high-temperature sealant. By setting high-temperature sealant in the above gaps, each connection interface can be effectively sealed after assembly, preventing high-temperature gas from seeping into the internal structure along the assembly gaps. At the same time, it can compensate for the thermal expansion differences of different components under high-temperature conditions, avoiding loosening or stress concentration caused by thermal expansion mismatch.

[0030] In this embodiment, the cavity between the support frame 6 and the front test piece 1 is filled and sealed with high-temperature cement. The high-temperature cement can ensure that high-temperature gas does not penetrate into the interior of the structure, thereby improving the overall long-term reliability.

[0031] In this embodiment, the front end of the lead tube 3 is connected to the cover plate 22 by threads and then welded to seal it. The tail end of the lead tube 3 is connected to the shielded cable accessory 4 by threads. In this structure, the lead tube 3 serves as a protective channel for the outlet of the coupling wire. The threaded front end combined with the welded seal ensures airtightness in a high-temperature, high-pressure gas environment and prevents the coupling wire from being damaged by vibration or thermal expansion and contraction. The threaded connection between the tail end and the shielded cable accessory 4 facilitates disassembly and maintenance. In some embodiments, a clamping nut 31 is also installed on the outer side of the front end of the lead tube 3, which serves to fix the lead tube 3.

[0032] The shielded cable accessory 4 contains a perforated wire-passing pressure plate 41. The thermocouple 13 wires are neatly arranged through the perforated pressure plate 41 and then connected to the compensating wires via the shielded cable accessory 4. This wire-passing pressure plate structure can position and clamp multiple thermocouple wires through perforations, ensuring that the thermocouple wires are laid straight without bending or offset. Their neat arrangement prevents mutual wear in high-speed vibration environments. Simultaneously, the structure of the shielded cable accessory 4 further improves the electromagnetic shielding effect, ensuring stable and reliable signal transmission from the thermocouple 13 to the compensating wires. The thermocouple wires and the compensating wires are welded inside the shielded cable accessory 4, and the weld joints are wrapped with high-temperature insulating tape.

[0033] In this embodiment, the support frame 6 is integrally formed by 3D printing, and the inlet connector 53 and outlet connector 54 are connected to the cover plate 22 by threads and then welded to seal. In this structure, the integral forming of the support frame 6 by additive manufacturing ensures that the channel shape of the internal water cooling pipeline 5 is precisely consistent and significantly reduces the leakage risk caused by the connection of multiple components. At the same time, the inlet connector 53 and outlet connector 54 are connected to the cover plate 22 by threads and then welded to seal, so that the cooling circuit has reliable mechanical fixation and sealing capabilities, and can maintain a stable supply of cooling medium under high temperature and high pressure environments.

[0034] Furthermore, the wall surface of the front test piece 1 is provided with vent holes 12 that communicate with the temperature acquisition chamber 11. In a specific embodiment, one temperature acquisition chamber 11 is connected to four vent holes 12. The temperature acquisition chamber 11 faces the incoming flow direction, and the vent holes 12 are symmetrically distributed on both sides of the temperature acquisition chamber 11.

[0035] Thermocouple 13 is a type B thermocouple with a second-level accuracy, achieving a temperature measurement accuracy of ±0.25%t and a temperature range of 600℃ to 1800℃. Its long-term operating temperature can reach 1600℃. The non-hot end is covered by a ceramic tube, while the hot end is exposed outside the ceramic tube. In some embodiments, the ratio of the length of the hot end immersed in the flow field to the thermocouple diameter is controlled to be ≥20:1. Under this length-to-diameter ratio condition, the axial temperature deviation caused by heat conduction can be significantly reduced, making the temperature measurement result closer to the actual total temperature of the flow field.

[0036] In this embodiment, the assembled sensing part is fixed to the temperature measurement interface of the gas equipment, so that the temperature sampling cavity 11 faces the windward side of the flow field to obtain a more accurate total temperature signal. The compensation wire is connected to the temperature acquisition instrument via the shielded cable accessory 4. After the equipment is started, the front test piece 1 first absorbs the heat of the high-speed, high-temperature gas and transfers the heat to the hot end of the thermocouple 13, so that it generates a thermoelectric potential corresponding to the temperature in a stable temperature field. The temperature acquisition instrument outputs the total gas temperature value in real time according to the correspondence between the thermoelectric potential and the temperature, thereby realizing accurate monitoring of the real-time operating condition of the gas equipment.

[0037] In this embodiment, the total temperature sensing unit has two working modes: no cooling and cooling. In the no cooling mode, the front test piece 1 relies on the high temperature resistance and thermal shock resistance of the ceramic matrix composite material to directly withstand the scouring of high-temperature gas and perform short-term temperature measurement. This is suitable for temperature measurement needs when the cooling system has not yet been established or under short-term high-temperature conditions. In the cooling mode, a cooling medium is introduced through the water-cooled pipes 5 formed inside the support frame to continuously cool the internal structure of the sensing unit, thereby achieving long-term stable temperature measurement of the total temperature sensing unit while ensuring structural safety.

[0038] This invention further provides a temperature signal-based cooling control mechanism, which uses the real-time total temperature signal output by thermocouple 13 to perform closed-loop control of the water inlet status of the external cooling water source. During cooling operation, the external cooling water source is dynamically controlled based on the real-time total temperature signal output by thermocouple 13. When the detected total gas temperature exceeds a preset temperature threshold, the control system automatically increases the inlet water flow rate into the water-cooling pipe 5 to enhance heat exchange capacity and suppress structural temperature rise. When the detected temperature decreases and falls back to the target range, the inlet water flow rate into the water-cooling pipe 5 is reduced accordingly to avoid over-cooling leading to temperature measurement deviation of thermocouple 13 or structural thermal fatigue, thus maintaining a better thermal balance state for the sensing element under alternating hot and cold operating conditions. Through this temperature-cooling bidirectional control mechanism, the cooling system can dynamically adapt to changes in gas temperature during different flight or operating stages, achieving more stable long-term temperature measurement performance and enhancing overall structural reliability.

[0039] In summary, this invention discloses a dual-condition high-temperature resistant total temperature sensing element, constructing a stable temperature measurement device compatible with both short-term uncooled and long-term water-cooled conditions. This technical solution utilizes a front test piece 1 and a rear protective sleeve 7 integrally molded from ceramic matrix composite material. Under uncooled conditions, the sensing element can rely on the material's high-temperature resistance and thermal shock resistance to achieve reliable short-term high-temperature measurement within the range of 1200℃ to 1600℃. Under cooling conditions, the structure is continuously cooled by water-cooling pipes 5 installed inside the support frame 6, and the cooling capacity is dynamically adjusted in conjunction with the total temperature signal from the thermocouple 13, thereby achieving long-term stable and high-precision temperature measurement above 1600℃. Meanwhile, the front test piece 1 and the rear protective sleeve 7 are reliably assembled through the stepped combination groove 61 on the support frame 6, and the key assembly gaps are sealed and buffered with high-temperature sealant and high-temperature cement, effectively absorbing thermal expansion differences, suppressing stress concentration and improving overall vibration resistance and long-term service stability, so that the thermocouple 13 is always in a working environment with controllable heating conditions and stable temperature field, thereby significantly reducing the total temperature measurement error.

[0040] The dual-condition high-temperature resistant total temperature sensing element proposed in this invention can effectively meet the needs of aero-engines, gas turbines and other high-temperature and high-speed flow field equipment for real-time and long-term total temperature measurement under extreme conditions. It breaks through the inherent limitations of traditional metal water-cooled probes in terms of temperature resistance, structural reliability and temperature measurement accuracy. It provides a more reliable and sustainable total temperature measurement technology solution for high thrust-to-weight ratio and high-efficiency gas thermal equipment. It has important engineering value and industrial significance for promoting the development of high-temperature measurement technology and improving the overall performance of aero-engine power and energy equipment.

[0041] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Under the concept of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the present invention as described above. For the sake of brevity, they are not provided in detail. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual-condition high-temperature resistant total temperature sensing element, suitable for both uncooled and cooled operating conditions, characterized in that, It includes a housing, lead wire assembly, mounting base (2), and support frame (6); The housing includes a front test piece (1) and a rear protective sleeve (7), both of which are integrally woven from ceramic matrix composite material; the front test piece (1) has a semi-cylindrical windward side, an internal temperature sampling cavity (11), and an external vent hole (12); a thermocouple (13) is installed in the temperature sampling cavity. The support frame (6) is provided with a stepped combination groove (61) on the side near the front test piece (1) and the rear protective sleeve (7). The tail of the front test piece (1) and the head of the rear protective sleeve (7) are bent and embedded into the corresponding fitting section of the stepped combination groove (61) to realize the combined installation of the front test piece (1), the support frame (6) and the rear protective sleeve (7). The supporting frame forms a bent water-cooling pipe (5), which includes an inlet pipe (51) and an outlet pipe (52), and is connected to an external water source through an inlet connector (53) and an outlet connector (54), respectively. The mounting base (2) includes a circumferential boss (21) and a cover plate (22), and the cover plate (22) and the circumferential boss (21) are sealed by welding; The lead wire device includes a ceramic tube, a lead wire tube (3) and a shielded cable accessory (4). The ceramic tube includes a double-hole ceramic tube and a single-hole ceramic tube. The double-hole ceramic tube is installed in the temperature acquisition cavity (11). The single-hole ceramic tube is respectively sleeved on the two pins of the thermocouple and introduced into the lead wire tube (3) through the cavity between the front test piece (1) and the support frame (6).

2. The dual-condition high-temperature resistant total temperature sensing element according to claim 1, characterized in that, The gaps between the stepped combined groove (61) and the front test piece (1) and the rear protective sleeve (7), as well as the gap between the front test piece (1) and the rear protective sleeve (7), are all filled with high-temperature sealant.

3. The dual-condition high-temperature resistant total temperature sensing element according to claim 2, characterized in that, The cavity between the support frame (6) and the front test piece (1) is filled and sealed with high-temperature cement.

4. The dual-condition high-temperature resistant total temperature sensing element according to claim 3, characterized in that, The front end of the lead tube (3) is welded and sealed to the cover plate (22) by threaded connection, and the tail end of the lead tube (3) is connected to the shielded cable accessory (4) by thread; the shielded cable accessory (4) is equipped with a multi-hole wire-passing pressure plate (41), and the wire of the thermocouple (13) is straightened by the multi-hole wire-passing pressure plate (41) and then connected to the compensating wire through the shielded cable accessory (4).

5. The dual-condition high-temperature resistant total temperature sensing element according to claim 1, characterized in that, The supporting frame (6) is integrally formed by 3D printing, and the water inlet connector (53) and the water outlet connector (54) are threadedly connected to the cover plate (22) and then welded and sealed.

6. The dual-condition high-temperature resistant total temperature sensing element according to claim 1, characterized in that, The temperature sampling cavity inside the front test piece (1) faces the windward side, and the vent holes (12) are symmetrically distributed on both sides of the temperature sampling cavity (11) and are connected to the temperature sampling cavity (11) one by one.

7. The dual-condition high-temperature resistant total temperature sensing element according to claim 1, characterized in that, The thermocouple (13) is a type B thermocouple with a second-level precision. Its non-hot end is covered with a ceramic tube, while the hot end is exposed outside the ceramic tube.

8. The dual-condition high-temperature resistant total temperature sensing element according to claim 1, characterized in that, An environmental barrier coating is deposited on the surface of the shell.

9. The dual-condition high-temperature resistant total temperature sensing element according to claim 1, characterized in that, In the absence of cooling, the front test piece (1) relies on the high temperature resistance of the ceramic matrix composite material to perform short-term temperature measurement; in the cooling condition, it is cooled by the water cooling pipeline (5) to achieve long-term stable temperature measurement of the total temperature sensing part.

10. The dual-condition high-temperature resistant total temperature sensing element according to claim 9, characterized in that, The external cooling water source is regulated based on the total temperature signal output by the thermocouple (13). When the detected temperature exceeds the preset threshold, the water inlet flow rate of the water cooling pipeline (5) is increased, and when the temperature decreases, the water inlet flow rate is reduced, so as to achieve dynamic matching between cooling capacity and gas temperature.

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