Combustion chamber outlet temperature distribution measuring device

Abstract

The utility model relates to the field of temperature measurement, in particular to a combustion chamber outlet temperature distribution measuring device which comprises a measuring base, a circumferential sliding block, a driving piece, a plurality of box bodies and temperature sensors with the same number as the box bodies. The measuring base and the circumferential sliding block are of a concentric annular structure. The driving piece is in transmission connection with the circumferential sliding block so that the circumferential sliding block can rotate in the circumferential direction relative to the measuring base. A displacement column is fixedly arranged in the box body, the displacement column is arranged along the radial direction of the measuring base, a movable sliding sleeve is sleeved on the displacement column, a connecting seat is fixedly arranged on the circumferential sliding block, one end of the connecting rod is hinged with the sliding sleeve, and the other end of the connecting rod is hinged with the connecting seat; a probe of the temperature sensor penetrates through the through hole and points to the circle center direction of the measuring base. In order to solve the technical problem that radial temperature distribution is difficult to accurately collect in the prior art, the device can dynamically measure all-round and all-radial temperature distribution of a combustion chamber outlet in a whole machine test run of a turbojet engine.

Description

Technical Field

[0001] The utility model relates to the field of temperature measurement, in particular to a combustion chamber outlet temperature distribution measuring device. Background Art

[0002] In the process of designing and experimenting with turbojet engines, it is necessary to conduct a whole-machine test run. During the whole-machine test run, attention should be paid to the temperature distribution at the combustion chamber outlet. The radial distribution of the combustion chamber outlet temperature is greatly affected by the combustion chamber cooling airflow, especially the effect of the secondary airflow before the outlet. According to simulation calculations, the outlet position is prone to have the characteristics of low radial center and edge temperatures and high radial middle temperatures. However, there is currently no good technical means to accurately collect radial temperature distribution, especially it is difficult to dynamically measure the full-circle and full-radial temperature distribution of the combustion chamber outlet during the whole-machine test run, making it difficult to provide data support for combustion chamber performance evaluation and engine temperature distribution optimization. Utility Model Content

[0003] In view of the technical problem that it is difficult to accurately collect radial temperature distribution by existing technical means, the utility model provides a combustion chamber outlet temperature distribution measuring device, which can dynamically measure the full-circle and full-radial temperature distribution of the combustion chamber outlet during the whole-machine test of the turbojet engine, providing data support for combustion chamber performance evaluation and engine temperature distribution optimization.

[0004] The utility model provides a technical solution as follows: a combustion chamber outlet temperature distribution measuring device, comprising a measuring base, a circumferential slider, a driving member, a plurality of boxes, and temperature sensors of the same number as the boxes; the measuring base and the circumferential slider are concentric annular structures, the measuring base is used to be fixedly connected to the engine housing, and the circumferential slider is movably arranged on the measuring base; the driving member is in transmission connection with the circumferential slider so that the circumferential slider rotates circumferentially relative to the measuring base; a plurality of boxes are evenly fixed on the outer side of the measuring base along the circumferential direction, and each of the boxes is located on the same side of the circumferential slider, a displacement column is fixedly arranged in the box body, the displacement column is arranged along the radial direction of the measuring base, a movable sliding sleeve is sleeved on the displacement column, a connecting seat is fixedly arranged on the circumferential slider, and also comprises a connecting rod, one end of the connecting rod is hinged to the sliding sleeve, and the other end of the connecting rod is hinged to the connecting seat; the temperature sensor is fixedly arranged on one side of the sliding sleeve, a plurality of through holes are arranged on the measuring base, and the probe of the temperature sensor passes through the through holes and points to the center direction of the measuring base.

[0005] Optionally, the driving member is a motor, the motor is fixedly arranged on the measuring base, a gear is arranged at the output end of the motor, a rack is arranged on the circumferential slider, and the gear is meshed with the rack.

[0006] Optionally, a cover plate is fixedly disposed on the box body, and the cover plate is located on a side of the box body away from the measuring base.

[0007] Optionally, a top block is fixedly provided on one side of the sliding sleeve, and the temperature sensor is fixedly connected to the top block.

[0008] Optionally, a guide groove is provided on the box body, and the top block is movably matched with the guide groove.

[0009] Optionally, a limiting convex ring is fixedly provided on the measuring base, and a limiting groove is provided on the circumferential sliding block, and the limiting groove is slidably matched with the limiting convex ring.

[0010] Optionally, the number of the box bodies and the temperature sensors is 12 or an integer multiple of 12.

[0011] Optionally, the temperature sensor is a platinum-rhodium thermocouple.

[0012] Beneficial Effects

[0013] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects: in view of the technical problem that it is difficult to accurately collect radial temperature distribution by prior art means, the utility model can dynamically measure the full-circle and full-radial temperature distribution of the combustion chamber outlet during the whole-machine test of the turbojet engine, providing data support for the combustion chamber performance evaluation and the optimization of the engine temperature distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic structural diagram of a combustion chamber outlet temperature distribution measuring device proposed in an embodiment of the utility model.

[0015] Figure 2 A schematic diagram of the partial structure of a combustion chamber outlet temperature distribution measuring device proposed in an embodiment of the utility model.

[0016] Figure 3 The present invention is a schematic diagram of the assembly of a combustion chamber outlet temperature distribution measuring device proposed in an embodiment of the present invention.

[0017] Figure 4 This is a schematic diagram of the assembly of the box body proposed in the embodiment of the utility model.

[0018] Figure 5 This is a schematic diagram of the assembly of the connecting socket proposed in the embodiment of the utility model.

[0019] Figure 6 It is a schematic diagram of a combustion chamber of a small turbojet engine involved in an embodiment of the utility model. DETAILED DESCRIPTION

[0020] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments.

[0021] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It should also be noted that, for the convenience of description, only the parts related to the utility model are shown in the accompanying drawings. The words "first", "second", etc. described in the present utility model are set for the convenience of describing the technical solution of the present utility model, and have no specific limiting effect. They are all general references and do not constitute a limiting effect on the technical solution of the present utility model. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments in the present application can be combined with each other. In the description of the present utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection between the insides of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. Multiple technical solutions in the same embodiment, and multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not have contradictions or conflicts, all of which are within the scope of protection required by the present utility model.

[0022] Example 1

[0023] Combined with Figure 1-6 This embodiment provides a combustion chamber outlet temperature distribution measuring device, comprising a measuring base 10, a circumferential slider 11, a driving member 12, a plurality of boxes 13, and temperature sensors 14 having the same number as the boxes 13. The measuring base 10 and the circumferential slider 11 are concentric annular structures, the measuring base 10 is used to be fixedly connected to the engine housing, and the circumferential slider 11 is movably arranged on the measuring base 10; the driving member 12 is in transmission connection with the circumferential slider 11, so that the circumferential slider 11 rotates circumferentially relative to the measuring base 10.

[0024] Several boxes 13 are evenly fixed on the outside of the measuring base 10 along the circumferential direction, and each box 13 is located on the same side of the circumferential slider 11. A displacement column 15 is fixedly arranged in the box 13. The displacement column 15 is arranged along the radial direction of the measuring base 10. A movable sliding sleeve 16 is sleeved on the displacement column 15. A connecting seat 17 is fixedly arranged on the circumferential slider 11, and also includes a connecting rod 18. One end of the connecting rod 18 is hinged to the sliding sleeve 16, and the other end of the connecting rod 18 is hinged to the connecting seat 17. The temperature sensor 14 is fixedly arranged on one side of the sliding sleeve 16. The measuring base 10 is provided with several through holes. The probe of the temperature sensor 14 passes through the through holes and points to the center direction of the measuring base 10.

[0025] In order to solve the technical problem that it is difficult to accurately collect radial temperature distribution with existing technical means, a combustion chamber outlet temperature distribution measuring device in this embodiment can dynamically measure the full-circle and full-radial temperature distribution of the combustion chamber outlet during the whole-machine test of the turbojet engine, thereby providing data support for combustion chamber performance evaluation and engine temperature distribution optimization.

[0026] For the combustion chamber outlet temperature distribution measurement device of this embodiment, an example of a combustion chamber outlet temperature measurement situation for a small turbojet engine is given below to explain its working principle.

[0027] First, fix the measuring base 10 on the engine housing, and electrically connect the driving member 12 and the temperature sensor 14 to the host computer used for the test run. During the engine test run, the driving member 12 controls the circumferential slider 11 to be at the zero position, that is, the connecting rod 18 controls the sliding sleeve 16 to be at the position closest to the measuring base 10. At this time, the probe end of the temperature sensor 14 is located near Figure 6 Middle point “1”.

[0028] When the engine is stable in a state, the host computer gives a control instruction to control the driving member 12 to start, and the driving member 12 drives the circumferential slider 11 to rotate relative to the measuring base 10. As the circumferential slider 11 rotates, it pushes the connecting rod 18 to move through the connecting seat 17, and the connecting rod 18 further pushes the sliding sleeve 16 to move along the displacement column 15, thereby driving the temperature sensor 14 to move radially away from the center of the measuring base 10. In this way, the probe of the temperature sensor 14 can reach the surrounding Figure 6 The robot stops at points "2" to "5" in the middle and collects data at different radial positions.

[0029] Obviously, since the driving element 12 and the temperature sensor 14 have been connected to the host computer, real-time dynamic adjustment can be achieved during the test run to obtain the full-circle temperature distribution of the combustion chamber outlet under different engine states.

[0030] It should be noted that even if the driver 12 and the temperature sensor 14 are not connected to the host computer, the driver 12 can also control its own control module and design a fixed running program according to the experimental process, thereby achieving real-time dynamic adjustment during the test run and obtaining the full-circle temperature distribution of the combustion chamber outlet under different engine conditions.

[0031] Among them, the temperature sensor 14 can preferably adopt a platinum-rhodium thermocouple, whose long-term maximum operating temperature is 1300° C. and short-term maximum operating temperature is 1600° C., which is suitable for the working conditions of a turbojet engine.

[0032] In an optional embodiment, the driving member 12 is a motor, which is fixedly arranged on the measuring base 10, and a gear 19 is arranged at the output end of the motor, and a rack 20 is arranged on the circumferential slider 11, and the gear 19 is meshed with the rack 20. Therefore, the gear 19 is driven to rotate by the rotation of the motor output shaft, and the rotation of the circumferential slider 11 can be realized by the meshing of the gear 19 and the rack 20.

[0033] And, in one embodiment, a limiting convex ring 100 is fixedly provided on the measuring base 10, and a limiting groove 110 is provided on the circumferential slider 11, and the limiting groove 110 is slidably matched with the limiting convex ring 100. Thus, the stability of the circumferential slider 11 when rotating relative to the measuring base 10 can be ensured by the mutual engagement of the limiting convex ring 100 and the limiting groove 110.

[0034] It should be noted that the number and distribution of the box bodies 13 and the temperature sensors 14 represent the number and distribution of the circumferential temperature measurement points. It is generally required that the number of circumferential temperature measurement points is a multiple of the number of combustion chamber nozzles. For the measurement object of the combustion chamber outlet temperature distribution measurement device of this embodiment, i.e., a small turbojet engine, the combustion chamber fuel injection ring has a total of 12 nozzles evenly distributed along the circumference. Therefore, in a preferred embodiment, the number of the box bodies 13 and the temperature sensors 14 is 12 or an integer multiple of 12.

[0035] In some embodiments, a cover plate 21 is fixedly disposed on the box body 13, and the cover plate 21 is located on the side of the box body 13 away from the measuring base 10. The provision of the cover body can facilitate the assembly of structures such as the sleeve 16 and the temperature sensor 14, thereby improving the overall convenience of the device.

[0036] And, in some embodiments, in order to ensure the stable setting of the temperature sensor 14, a top block 22 is fixedly provided on one side of the sliding sleeve 16, and the temperature sensor 14 is fixedly connected to the top block 22. A threaded hole or a through hole is provided on the top block 22, and one end of the temperature sensor 14 is directly matched and connected to the threaded hole, or can be connected to the top block 22 by a bolt.

[0037] Furthermore, a guide groove 23 may be provided on the box body 13 so that the top block 22 can be movably matched with the guide groove 23 , thereby limiting the top block 22 through the guide groove 23 , thereby ensuring the stability of the movement of the temperature sensor 14 .

[0038] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creative design without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A combustion chamber outlet temperature distribution measuring device, characterized in that: It includes a measuring base, a circumferential slider, a driving member, a plurality of boxes, and temperature sensors whose number matches the number of the boxes; The measuring base and the circumferential slider are concentric annular structures, the measuring base is used to be fixedly connected to the engine housing, and the circumferential slider is movably arranged on the measuring base; the driving member is transmission-connected to the circumferential slider so that the circumferential slider rotates circumferentially relative to the measuring base; A plurality of the box bodies are evenly fixedly arranged on the outer side of the measuring base along the circumferential direction, and each of the box bodies is located on the same side of the circumferential slider. A displacement column is fixedly arranged in the box body, and the displacement column is arranged along the radial direction of the measuring base. A movable sliding sleeve is sleeved on the displacement column. A connecting seat is fixedly arranged on the circumferential slider, and also includes a connecting rod, one end of which is hinged to the sliding sleeve, and the other end of which is hinged to the connecting seat. The temperature sensor is fixedly arranged on one side of the sliding sleeve, a plurality of through holes are arranged on the measuring base, and the probe of the temperature sensor passes through the through holes and points to the center direction of the measuring base.

2. A combustion chamber outlet temperature distribution measuring device according to claim 1, characterized in that: The driving member is a motor, which is fixedly arranged on the measuring base. A gear is arranged at the output end of the motor, and a rack is arranged on the circumferential slider, and the gear is meshed with the rack.

3. The combustion chamber outlet temperature distribution measuring device according to claim 1, characterized in that: A cover plate is fixedly arranged on the box body, and the cover plate is located at a side of the box body away from the measuring base.

4. A combustion chamber outlet temperature distribution measuring device according to claim 1, characterized in that: A top block is fixedly arranged on one side of the sliding sleeve, and the temperature sensor is fixedly connected to the top block.

5. A combustion chamber outlet temperature distribution measuring device according to claim 4, characterized in that: The box body is provided with a guide groove, and the top block is movably matched with the guide groove.

6. The combustion chamber outlet temperature distribution measuring device according to claim 1, characterized in that: A limiting convex ring is fixedly arranged on the measuring base, and a limiting groove is arranged on the circumferential sliding block, and the limiting groove is slidably matched with the limiting convex ring.

7. The combustion chamber outlet temperature distribution measuring device according to claim 1, characterized in that: The number of the box bodies and the temperature sensors is 12 or an integer multiple of 12.

8. A combustion chamber outlet temperature distribution measuring device according to any one of claims 1 to 7, characterized in that: The temperature sensor is a platinum-rhodium thermocouple.

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