Total temperature test sensing part

Abstract

The invention relates to the technical field of aero-engine testing, in particular to a total temperature testing sensing part. The invention provides a total temperature test sensing part which comprises a main cover, a supporting rod, a mounting base, a pressing piece, a stagnation cover and a thermocouple. The main cover and the pressing piece are arranged on the two sides of the supporting rod and seal the supporting rod; the supporting rod is connected with the mounting seat; the mounting seat is connected with the cartridge receiver through a fastener; a plurality of thermocouples are arranged on the supporting rod and are used for measuring the temperatures of different positions; and the stagnation cover is fixed on the supporting rod and is arranged outside the thermocouple. The total temperature test sensing part provided by the invention has good test performance, can realize quick response of the total temperature test, greatly improves the total temperature measurement precision, and provides accurate and reliable data support for the test.

Description

Technical Field

[0001] This invention relates to the field of aero-engine testing technology, and more specifically, to a rapid-response airflow total temperature testing sensor. Background Technology

[0002] Aero engines represent the pinnacle of equipment manufacturing, showcasing a nation's technological prowess and overall strength. They require not only advanced design concepts and manufacturing processes but also extensive testing and verification to ensure performance, reliability, and safety.

[0003] Aero-engine testing is a crucial step in verifying engine performance and reliability. In the field of aero-engine testing, transient performance assessment is a vital component, significantly impacting the determination of engine transient response performance. Transient performance assessment refers to the performance testing and evaluation during engine operation when switching states or maneuvers. Transient states typically include stages such as start-up, acceleration, deceleration, and shutdown, which impose requirements on the engine's response speed, stability, and combustion efficiency.

[0004] However, the current transition temperature testing scheme has some problems. It cannot meet the requirements of fast response time, nor can it quickly and accurately obtain the total temperature value of the airflow inside the engine. It cannot fully meet the requirements of accurately obtaining transition performance parameters, thus restricting the effective acquisition of engine performance parameters and the performance evaluation work. Summary of the Invention

[0005] The purpose of this invention is to provide a total temperature testing sensing element that solves the problem that the transition state temperature testing in the prior art is difficult to meet the requirements of rapid response and rapid and accurate acquisition.

[0006] To achieve the above objectives, the present invention provides a total temperature testing sensing element, comprising a main cover, a support rod, a mounting base, a pressure plate, a hysteresis shield, and a thermocouple:

[0007] The main cover and pressure plate are located on both sides of the support rod to enclose it.

[0008] The support rod is connected to the mounting base;

[0009] The mounting base is connected to the housing by fasteners;

[0010] Multiple thermocouples are arranged on the support rod to measure the temperature at different locations;

[0011] The stagnation cover is fixed on the support rod and is installed outside the thermocouple.

[0012] In one embodiment, the total temperature test sensing element further includes a gasket disposed between the mounting base and the casing.

[0013] In one embodiment, the stagnation cover has a U-shaped groove;

[0014] The thermocouple is installed inside the U-shaped groove.

[0015] In one embodiment, the thermocouple is a small inertial thermocouple.

[0016] In one embodiment, multiple thermocouples are arranged radially at multiple points on the support rod;

[0017] The thermocouples are arranged parallel to the airflow direction.

[0018] In one embodiment, a spherical thermal node is provided at the top of the thermocouple.

[0019] In one embodiment, the diameter of the thermocouple is 0.1 to 0.3 mm, and the diameter of the spherical thermal node is less than 0.3 mm.

[0020] In one embodiment, the spherical thermal node is flattened.

[0021] In one embodiment, the total temperature testing sensing element further includes a plurality of ceramic tubes:

[0022] The plurality of ceramic tubes pass through the pins of the thermocouple and are housed within the support rod;

[0023] The ceramic tube is fixed by filling the inside of the support rod with glue or cement.

[0024] In one embodiment, the plurality of ceramic tubes includes a double-hole ceramic tube and a plurality of single-hole ceramic tubes:

[0025] The double-hole ceramic tube passes through the two prongs of the thermocouple and abuts against the step of the stagnation cover;

[0026] The single-hole ceramic tube passes through a single pin of the thermocouple.

[0027] In one embodiment, the support rod is fixed to the mounting base by welding methods such as argon arc welding;

[0028] The stagnation cover is fixed to the support rod by welding methods such as laser welding or silver brazing.

[0029] The total temperature testing sensor proposed in this invention has excellent testing performance, enabling rapid response in total temperature testing, quick and accurate measurement of temperature changes, and significantly improving the accuracy of total temperature measurement, thus providing accurate and reliable data support for experiments. Attached Figure Description

[0030] The above-described and other features, properties, and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, in which the same reference numerals consistently denote the same features.

[0031] in:

[0032] Figure 1 A schematic diagram of the overall structure of the total temperature testing sensor according to an embodiment of the present invention is disclosed;

[0033] Figure 2 A schematic diagram of the structure of a stagnation cover according to an embodiment of the present invention is disclosed;

[0034] Figure 3 A schematic diagram of the installation of a thermocouple and a ceramic tube according to an embodiment of the present invention is disclosed.

[0035] The meanings of the labels in the figures are as follows:

[0036] 1. Main cover;

[0037] 2 rods;

[0038] 3 mounting bases;

[0039] 4 gaskets;

[0040] 5. Tableting;

[0041] 6. Stabilizing shield;

[0042] 7. First ceramic tube;

[0043] 8. Second ceramic tube;

[0044] 9. Third ceramic tube;

[0045] 10. Thermocouples. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0047] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Although the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation, the shape, quantity and proportion of each component in the actual implementation can be arbitrarily changed, and the layout of the components may also be more complex.

[0048] Figure 1 A schematic diagram of the overall structure of the total temperature testing sensing element according to an embodiment of the present invention is shown, as follows: Figure 1As shown, the total temperature testing sensing element proposed in this invention includes a main cover 1, a support rod 2, a mounting base 3, a gasket 4, a pressure plate 5, a stagnation cover 6, a first ceramic tube 7, a second ceramic tube 8, a third ceramic tube 9, and a thermocouple 10.

[0049] The main cover 1 is located on one side of the support rod 2 and serves as a cover for the support rod 2, sealing off the cable outlet of the support rod 2.

[0050] The support rod 2 is connected and fixed to the mounting base 3;

[0051] The mounting base 3 is connected and fixed to the housing by fasteners;

[0052] Multiple thermocouples 10 are arranged on the support rod 2 for measuring the temperature at different locations;

[0053] The pressure plate 5 is located on the other side of the support rod 2, and closes the rear end of the support rod 2;

[0054] The stagnation cover 6 is fixed on the support rod 2 and is set outside the thermocouple 10.

[0055] The interior of support rod 2 is treated with glue, while both sides are open structures, including the rear end of support rod 2 and the cable outlet. After glue filling, pressure plate 5 is used to seal the rear end of support rod 2, which serves the same purpose as the main cover 1 sealing the cable outlet of support rod 2.

[0056] In this embodiment, the mounting base 3 is fixedly connected to the casing by bolts, so that the entire total temperature test sensing part is fixed to the casing by bolts through the mounting base 3.

[0057] In this embodiment, multiple thermocouples 10 are arranged on the support rod 2, with multiple measuring points arranged radially, so as to meet the requirement of measuring at different radial positions at the same circumferential position, thereby measuring the temperature at different radial positions, so as to record the total temperature and aerodynamic performance of the entire annulus in the engine flow channel.

[0058] This arrangement allows for simultaneous measurements at different radial positions, enabling the acquisition of the area distribution across the entire annulus and providing better support for recording the total airflow temperature parameters of each cross-section of the engine.

[0059] The thermocouple 10 is arranged parallel to the airflow direction. Compared with the conventional vertical arrangement, the thermocouple 10 is completely aligned with the gas flow direction, which makes the structure withstand a smaller airflow load, improves the overall reliability, and thus achieves more accurate total temperature measurement.

[0060] In this embodiment, the gasket 4 is disposed between the mounting base 3 and the casing to prevent gas leakage.

[0061] Gasket 4 is typically made of elastic material, offering good sealing performance and durability. It fits tightly against the gap between mounting base 3 and the casing, effectively preventing gas from escaping. Gasket 4 also provides some cushioning.

[0062] Furthermore, the support rod 2 is fixed to the mounting base 3 by welding methods such as argon arc welding. Argon arc welding is a commonly used metal welding method with the characteristics of high welding quality, fast welding speed, wide applicability, and simple operation.

[0063] Furthermore, the stagnation cover 6 is fixed to the support rod 2 by welding methods such as laser welding or silver brazing. Laser welding is a highly efficient and precise welding method that uses a high-energy-density laser beam as a heat source. Laser welding is one of the important applications of laser material processing technology.

[0064] The thermocouple 10 is disposed inside the stagnation cover 6 and passes through the support rod 2.

[0065] Figure 2 A schematic diagram of the structure of a stabilizing cover according to an embodiment of the present invention is shown, as follows: Figure 2 As shown, the thermocouple 10 is equipped with a stagnation shield 6, which can significantly reduce speed error, reduce measurement error, further improve measurement accuracy, and at the same time reduce the aerodynamic force on the thermocouple wire, thereby improving the service life of the thermocouple.

[0066] Furthermore, the stagnation cover 6 has a U-shaped groove, and the thermocouple 10 is placed in the U-shaped groove. The stagnation cover 6 with the U-shaped groove structure increases the area of ​​the exhaust port and increases the airflow velocity, thereby enhancing the gas convection heat transfer effect, reducing the time constant, and realizing a fast response.

[0067] In this embodiment, the thermocouple 10 is a small inertial thermocouple.

[0068] Small inertial thermocouples are thermocouples designed to provide fast response times. They are suitable for applications requiring high-frequency, high-sensitivity measurement of temperature changes. By using small inertial thermocouples, the problem of rapid response to total temperature can be solved.

[0069] Different types of small inertial thermocouples can be selected within different temperature ranges to achieve flexible measurements.

[0070] In the performance testing of aero-engine development and production, small inertial thermocouples are often used to monitor the true temperature of the gas flow being tested with the fastest response speed, in order to prevent the gas from overheating and burning engine components.

[0071] The thermocouple 10 is provided with a spherical thermal node at its top.

[0072] In this embodiment, the thermocouple 10 is selected with a diameter of φ0.1 to 0.3 mm, and the diameter of the spherical thermal node is controlled within... Within this range, the time constant is reduced by decreasing the diameter of the dipole wire and the volume of the thermal node.

[0073] Furthermore, the spherical thermal node of thermocouple 10 is flattened, which increases the heat transfer area while maintaining the same volume, effectively improving the convective heat transfer coefficient and thus reducing the time constant.

[0074] Furthermore, the total temperature testing sensing element proposed in this invention includes several ceramic tubes;

[0075] The plurality of ceramic tubes pass through the pins of the thermocouple 10 and are housed inside the support rod 2;

[0076] The ceramic tube is fixed by filling the inside of the support rod 2 with glue or cement.

[0077] The advantage of using glue or cement to fill the inside of the support rod 2 is that it can fill the gap between the ceramic tube and the support rod 2, making the ceramic tube more stable and secure within the support rod 2. At the same time, glue or cement can also enhance damping, reduce the vibration of the ceramic tube, and thus extend the service life of the total temperature test sensor.

[0078] Figure 3 A schematic diagram illustrating the installation of a thermocouple and a ceramic tube according to an embodiment of the present invention is shown, as follows: Figure 3 As shown, the plurality of ceramic tubes includes a first ceramic tube 7, a second ceramic tube 8, and a third ceramic tube 9:

[0079] The first ceramic tube 7 is a double-hole ceramic tube that passes through the two pins of the thermocouple 10 and is held in place by the step of the stagnation cover 6 to prevent the first ceramic tube 7 from slipping out.

[0080] The second ceramic tube 8 and the third ceramic tube 9 are single-hole ceramic tubes that pass through a single pin of the thermocouple 10.

[0081] After the second ceramic tube 8 and the third ceramic tube 9, several identical single-hole ceramic tubes can be installed, similar to beads threaded onto the pins of the thermocouple 10.

[0082] The single-hole ceramic tube is placed in the support rod 2, and the support rod 2 is fixed inside the support rod 2 by means of glue injection or cement injection.

[0083] All of the ceramic tubes are used for insulation and heat insulation, which can effectively reduce thermal conductivity error. They not only maintain stable performance in high-temperature environments, but also have good durability and reliability, and can effectively prevent heat loss and the generation of thermal conductivity error.

[0084] The total temperature testing sensor proposed in this invention can achieve a rapid response from 245°C to 571°C at a Mach number of 0.2, with a time constant of approximately 0.1 s and an average total temperature recovery rate of 0.999. This means that when the measured value is 100°C, its speed error is only 0.1°C.

[0085] After rigorous vibration testing of the total temperature test sensor in civil aircraft engines, and subsequent functional and structural checks, it was confirmed that the sensor is intact and reliable.

[0086] The total temperature test sensor proposed in this invention is not only applicable to test projects that require rapid response of total temperature test, such as engine acceleration and deceleration test and transient state test, but can also be applied to other conventional test projects.

[0087] The total temperature testing sensor proposed in this invention has excellent testing performance, enabling rapid response in total temperature testing, quick and accurate measurement of temperature changes, and significantly improving the accuracy of total temperature measurement, thus providing accurate and reliable data support for experiments.

[0088] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0089] As shown in this application and claims, unless the context clearly indicates otherwise.

[0090] The words “a,” “an,” “a,” and / or “the” do not specifically refer to the singular and may also include the plural. Generally speaking, the terms “comprising” and “including” only indicate that the steps and elements that are explicitly identified are included, and these steps and elements do not constitute an exclusive list; the method or apparatus may also include other steps or elements.

[0091] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more, unless explicitly defined otherwise.

[0092] Unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0093] The above embodiments are provided for those skilled in the art to implement or use the present invention. Those skilled in the art can make various modifications or changes to the above embodiments without departing from the inventive concept of the present invention. Therefore, the protection scope of the present invention is not limited to the above embodiments, but should be the maximum scope that conforms to the innovative features mentioned in the claims.

Claims

1. A total temperature testing sensing element, characterized in that, Includes main cover, support rod, mounting base, pressure plate, stagnation cover, and thermocouple: The main cover and pressure plate are located on both sides of the support rod to enclose it. The support rod is connected to the mounting base; The mounting base is connected to the housing by fasteners; Multiple thermocouples are arranged on the support rod to measure the temperature at different locations; The stagnation cover is fixed on the support rod and is installed outside the thermocouple.

2. The total temperature testing sensing element according to claim 1, characterized in that, It also includes a gasket, which is placed between the mounting base and the casing.

3. The total temperature testing sensing element according to claim 1, characterized in that, The stagnation cover has a U-shaped groove; The thermocouple is installed inside the U-shaped groove.

4. The total temperature testing sensing element according to claim 1, characterized in that, The thermocouple is a small inertial thermocouple.

5. The total temperature testing sensing element according to claim 1, characterized in that, Multiple thermocouples are arranged radially at multiple points on the support rod; The thermocouples are arranged parallel to the airflow direction.

6. The total temperature testing sensing element according to claim 1, characterized in that, The thermocouple is provided with a spherical thermal node at its top.

7. The total temperature testing sensing element according to claim 6, characterized in that, The diameter of the thermocouple is 0.1 to 0.3 mm, and the diameter of the spherical thermal node is less than 0.3 mm.

8. The total temperature testing sensing element according to claim 6, characterized in that, The spherical thermal node is flattened.

9. The total temperature testing sensing element according to claim 1, characterized in that, It also includes several ceramic tubes: The plurality of ceramic tubes pass through the pins of the thermocouple and are housed within the support rod; The ceramic tube is fixed by filling the inside of the support rod with glue or cement.

10. The total temperature testing sensing element according to claim 9, characterized in that, The plurality of ceramic tubes includes double-hole ceramic tubes and a plurality of single-hole ceramic tubes: The double-hole ceramic tube passes through the two prongs of the thermocouple and abuts against the step of the stagnation cover; The single-hole ceramic tube passes through a single pin of the thermocouple.

11. The total temperature testing sensing element according to claim 1, characterized in that, The support rod is fixed to the mounting base by welding. The stagnation cover is fixed to the support rod by welding.

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