Air inlet measuring device suitable for high-power turboshaft engine test

Abstract

The invention provides an air inlet measuring device suitable for a high-power turboshaft engine test, and belongs to aero-engine testing devices, the air inlet measuring device comprises an air inlet channel main body, a measuring seat is arranged on the outer surface of the air inlet channel main body close to an air inlet mesh enclosure, and a measuring sensor is installed in the measuring seat; the flexible connection section comprises an e-shaped sealing ring; the e-shaped sealing ring is mounted between the air inlet passage main body and the air inlet passage switching section; and one end of the e-shaped sealing ring is hermetically connected with the inner surface of the air inlet passage main body, and the other end of the e-shaped sealing ring is hermetically attached to the outer surface of the air inlet passage switching section. When engines of different models need to be tested, only the air inlet passage switching section needs to be replaced, and the whole air inlet passage main body does not need to be redesigned; meanwhile, due to the fact that the e-shaped sealing ring is arranged between the air inlet channel switching section and the air inlet channel body, vibration can be isolated, air leakage is prevented, it is guaranteed that connection is free of steps, damage of engine vibration to the air inlet measuring device is reduced, and the service life of the testing device is prolonged.

Description

Technical Field

[0001] The invention belongs to an aero-engine testing device, and in particular relates to an air intake measuring device suitable for testing a high-power turboshaft engine. Background Art

[0002] When the aviation turboshaft engine is undergoing ground testing, in order to obtain accurate engine performance parameters, the engine's intake conditions need to be measured. The current intake measurement device mainly adopts an integrated design based on the engine interface size. During the engine test, the engine vibrates, which causes a gap between the engine and the intake duct body, resulting in seal failure. At the same time, different models of engines need to be adapted to different intake duct bodies, resulting in economic waste.

[0003] The invention discloses an air intake device for a large bypass ratio engine core test with the publication number CN116380472A, which belongs to the field of aviation engine test technology. The device is used to simulate the whole machine pressure field in the engine core test, and includes an inlet guide basin, an air flow measurement section, an expansion section and an engine inlet transition section arranged in sequence along the airflow direction. The expansion section is provided with an inner sleeve for pre-distributing the incoming flow, and the inner sleeve is connected to the expansion section through a plurality of inner and outer sleeve support plates. The air intake device reduces the diameter of the flow tube at the air flow measurement point by adding a sleeve to the expansion channel, so that the Mach number of the internal airflow is between 0.2 and 0.6; on the other hand, the flow distribution in the expansion channel is changed, so that the total pressure near the outer casing at the core inlet is higher, which is closer to the pressure field distribution at the core inlet under the whole machine environment, and the test results are closer to the core performance under the whole machine environment.

[0004] The above-mentioned device discloses changing the flow distribution in the expansion channel, but does not explain the connection between the test device and the engine and how to reduce the vibration of the engine; therefore, there is a need for a measuring device that can eliminate the vibration between the engine and the intake duct body and can be suitable for different models of engines. Summary of the invention

[0005] In view of the above problems, the present invention proposes an air intake measurement device suitable for testing a high-power turboshaft engine, comprising an air intake duct body, one end of the air intake duct body is connected to an air intake duct transition section through a soft connection section, and the other end is equipped with an air intake mesh cover;

[0006] A measuring seat is provided on the outer surface of the air inlet main body near the air inlet mesh cover, and a measuring sensor is installed in the measuring seat;

[0007] The soft connection section includes an E-type sealing ring, which is installed between the air inlet duct main body and the air inlet duct transition section; the E-type sealing ring is hollow, and one end is sealed and connected to the inner surface of the air inlet duct main body, and the other end is sealed and fitted to the outer surface of the air inlet duct transition section.

[0008] Furthermore, the E-shaped sealing ring opening is located on a side of the air inlet main body away from the air inlet mesh cover.

[0009] Furthermore, the soft connection section also includes a retaining ring, which is installed at one end of the air inlet duct body away from the air inlet mesh cover, and the inner diameter of the retaining ring is larger than the outer diameter of the E-type sealing ring; the retaining ring is located on the side of the E-type sealing ring away from the air inlet duct body.

[0010] Furthermore, the air intake grille includes a first grille and a second grille, and the first grille and the second grille are spliced ​​to wrap around an end of the air intake main body away from the air intake transition section.

[0011] Furthermore, the first mesh cover includes a semicircular frame, a semicircular frame and a connecting rod, the semicircular frame and the semicircular frame are connected by the connecting rod, and the outer surface of the semicircular frame, the outer surface of the semicircular frame and the outer surface between the semicircular frame and the semicircular frame are wrapped with a metal mesh.

[0012] Furthermore, the air intake measurement device also includes a bracket, on which a slide rail is provided; a sliding frame is slidably mounted on the slide rail, and the sliding frame is connected to the air intake duct body via a support rod; and the air intake mesh cover is connected to the sliding frame.

[0013] Furthermore, the support rod includes a handle, a first base connected to the air inlet main body, and a second base connected to the sliding frame; two ends of the handle are respectively threadedly connected to the first base and the second base.

[0014] Furthermore, the outer surfaces of both ends of the handle are respectively provided with different-direction threads.

[0015] Furthermore, a connecting ring is provided on the outer side of one end of the air inlet transition section away from the air inlet main body, and the connecting ring is connected to the engine.

[0016] Furthermore, the air intake duct body is made of carbon fiber composite material.

[0017] Beneficial effects of the present invention:

[0018] 1. When the present invention needs to test engines of different models, it is only necessary to replace the intake duct adapter section without redesigning the entire intake duct body, which greatly reduces the cost expenditure; at the same time, since an E-type sealing ring is provided between the intake duct adapter section and the intake duct body, the E-type sealing ring can isolate vibration, prevent gas leakage, and ensure that the connection has no steps, thereby reducing the damage of the engine vibration to the intake measurement device and extending the life of the test device.

[0019] 2. The present invention fixes the air intake mesh cover and the air intake duct body on the sliding frame, moves synchronously with the engine, and is convenient for disassembly from the engine.

[0020] 3. The handle of the present invention is provided with different-direction threads at both ends, and the first base and the second base are threadedly connected to the handle, and the height can be adjusted steplessly by rotating the handle. On the one hand, it is convenient to separate the intake measurement device from the engine after disassembly, and on the other hand, it can withstand the axial thermal expansion caused by the engine being heated during the test.

[0021] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 The overall schematic diagram of the intake air measurement device in the embodiment of the present invention is shown.

[0024] Figure 2 A partial structural schematic diagram of an intake air measurement device in an embodiment of the present invention is shown.

[0025] Figure 3 A schematic structural diagram of a support rod of an intake air measurement device in an embodiment of the present invention is shown.

[0026] Figure 4 The figure shows the installation position of the soft connection section of the intake air measurement device in the embodiment of the present invention and a partial enlarged structural schematic diagram.

[0027] In the figure, 1. air inlet main body; 2. air inlet transition section; 3. soft connection section; 31. e-type sealing ring; 32. retaining ring; 4. measuring seat; 5. air inlet mesh cover; 51. first mesh cover; 511. semicircular ring frame; 512. semicircular frame; 513. connecting rod; 52. second mesh cover; 53. buckle; 6. support rod; 61. handle; 62. first base; 63. second base; 7. bracket; 8. slide rail; 9. sliding frame; 10. connecting ring. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] like Figure 1 As shown, Figure 1 FIG. 1 shows an overall schematic diagram of an intake air measurement device according to an embodiment of the present invention. Figure 1 , an air intake measurement device suitable for testing a high-power turboshaft engine, comprising an air intake duct body 1, one end of the air intake duct body 1 is connected to an air intake duct transition section 2 through a soft connection section 3, and the other end is equipped with an air intake mesh cover 5; specifically, the air intake duct body 1 is responsible for the air intake measurement function, and the air intake duct transition section 2 is responsible for the connection function. When the engine inlet size changes, the modification can be achieved by only replacing the air intake duct transition section 2, which can reduce the cost expenditure;

[0030] A measuring seat 4 is provided on the outer surface of the air inlet body 1 near the air inlet grille 5, and a measuring sensor is installed in the measuring seat 4; the measuring sensor includes a pressure sensor and a temperature sensor, etc. Figure 4 The soft connection section 3 includes an e-type sealing ring 31, which is installed between the air inlet main body 1 and the air inlet transition section 2; the e-type sealing ring 31 is hollow, and one end is sealed and connected to the inner surface of the air inlet main body 1, and the other end is sealed and fitted to the outer surface of the air inlet transition section 2. The hollow e-type sealing ring 31 can eliminate the vibration of the engine and can achieve sealing. If a solid sealing ring is used, it cannot eliminate the vibration of the engine well, and the air inlet main body 1 will vibrate; at the same time, since the e-type sealing ring 31 is hollow at the upper end and has an opening at the lower end, it can integrate the vibration of a larger engine.

[0031] Specifically, the design of the e-type sealing ring 31 can isolate vibration, prevent gas leakage, and ensure that the connection is step-free. Through the design of the intake duct transition section 2, when the engine inlet size changes, only the intake duct transition section 2 needs to be replaced, and there is no need to redesign the entire intake duct body 1, which greatly reduces the cost expenditure. In addition, the intake duct body 1 is softly connected by the e-type sealing ring 31, which isolates the vibration of the intake duct body 1 driven by the engine, reduces the damage to the intake duct body 1 and the measurement sensor on the intake duct body 1, and prolongs the life of the intake measurement device.

[0032] Specifically, the opening of the e-shaped sealing ring 31 is located at the side of the air inlet duct body 1 away from the air inlet mesh cover 5. The installation of the e-shaped sealing ring 31 is directional and deviates from the air inlet direction to prevent the opening from being blown open by the air flow.

[0033] In the above embodiment, another optional implementation is that the soft connection section 3 also includes a retaining ring 32, and the retaining ring 32 is installed at one end of the air inlet duct body 1 away from the air inlet mesh cover 5, and the inner diameter of the retaining ring 32 is larger than the outer diameter of the e-type sealing ring 31; the retaining ring 32 is located on the side of the e-type sealing ring 31 away from the air inlet duct body 1. Specifically, the retaining ring 32 is used to prevent the air inlet duct body 1 from separating from the air inlet duct transition section 2, and is convenient for disassembly and assembly. During installation, the e-type sealing ring 31 is adsorbed on the outer surface of the air inlet duct transition section 2, inserted into the air inlet duct body 1, and then fixed by the retaining ring 32, so that the retaining ring 32 blocks the e-type sealing ring 31, prevents the e-type sealing ring 31 and the air inlet duct transition section 2 from detaching from the air inlet duct body 1, prevents the air inlet duct body 1 from separating from the air inlet duct transition section 2, and is convenient for disassembly and assembly.

[0034] refer to Figure 2 The air intake grille 5 includes a first grille 51 and a second grille 52, which are spliced ​​to wrap the end of the air intake duct body 1 away from the air intake duct transition section 2. Specifically, the first grille 51 and the second grille 52 are fixedly connected by a buckle 53, which is convenient for disassembly and assembly. The air intake grille 5 is fixed to the metal mesh and the grille frame by stainless steel rivets, and the rivets are spot welded to the grille to prevent the rivets from falling off.

[0035] Furthermore, the first mesh cover 51 and the second mesh cover 52 respectively include a semicircular frame 511, a semicircular frame 512 and a connecting rod 513, the semicircular frame 511 and the semicircular frame 512 are connected by the connecting rod 513, and the outer surface of the semicircular frame 511, the outer surface of the semicircular frame 512 and the outer surface between the semicircular frame 511 and the semicircular frame 512 are wrapped with a metal mesh.

[0036] Specifically, during installation, the semicircular ring frame 511 is put on the air inlet duct body 1, and the inner diameter of the semicircular ring frame 511 is slightly larger than the outer diameter of the air inlet duct body 1, so as to achieve a relatively tight seal to prevent dust and impurities from entering the air inlet duct body 1; the two semicircular frames 512 are spliced ​​to form a complete circular plate, so as to achieve sealing, and the outer sides of the semicircular ring frames 511 and 512 and between the semicircular ring frames 511 and 512 are wrapped with metal mesh, so as to wrap the air inlet of the air inlet duct body 1 and achieve all-round filtering.

[0037] Furthermore, the air intake grille 5 is fixed on the same basis as the air intake duct body 1 and can move synchronously with the engine; that is, it is fixed on the sliding frame 9; the first grille 51 and the second grille 52 are fixedly connected by a buckle 53, which is convenient for disassembly and assembly. The air intake grille 5 is fixed to the metal mesh and the grille frame by stainless steel rivets, and the rivets are spot welded to the grille to prevent the rivets from falling off.

[0038] In the implementation of the present invention, the air intake measurement device also includes a bracket 7, on which a slide rail 8 is provided; a sliding frame 9 is slidably mounted on the slide rail 8, and the sliding frame 9 is connected to the air intake duct body 1 through a support rod 6; the air intake mesh cover 5 is connected to the sliding frame 9. Specifically, the sliding frame 9 slides on the slide rail 8, thereby driving the air intake mesh cover 5 and the air intake duct body 1 to move synchronously, thereby facilitating docking with the engine. Specifically, when the engine expands due to heat, since the engine is fixed, the air intake duct body 1 connected to the engine will move along the slide rail 8 to overcome the movement caused by the engine expansion, thereby achieving fine-tuning. Reference Figure 3 The support rod 6 includes a handle 61, a first base 62 connected to the air inlet body 1, and a second base 63 connected to the sliding frame 9; the two ends of the handle 61 are respectively threadedly connected to the first base 62 and the second base 63. Two support rods 6 are designed, and the two support rods 6 are respectively connected between the sliding frame 9 and the air inlet body 1. A metal clamp is arranged on the first base 62, and a rubber pad is arranged inside the metal clamp, and the rubber pad is used to prevent the metal clamp from damaging the air inlet body 1. The first base 62 and the second base 63 are inversely threaded, and the handle 61 on the support rod 6 can be rotated to drive the first base 62 and the second base 63 to move toward or away from each other. By rotating different numbers of circles, stepless adjustment in height can be achieved, and then the height of the air inlet body 1 can be fine-tuned, so as to facilitate docking with the engine and improve docking accuracy. On the one hand, the support rod 6 facilitates the separation of the intake measurement device from the engine after disassembly, and on the other hand, it can withstand the axial thermal expansion of the engine caused by heating during the test.

[0039] Furthermore, the outer surfaces of both ends of the handle 61 are respectively provided with different-direction threads. Specifically, the handle 61 on the support rod 6 can be rotated to drive the first base 62 and the second base 63 to move toward or away from each other, and the height can be adjusted steplessly by rotating different numbers of circles.

[0040] In the above embodiment, another optional implementation is that a connecting ring 10 is provided on the outer side of the end of the air inlet duct adapter section 2 away from the air inlet duct body 1, and the connecting ring 10 is connected to the engine. The connecting ring 10 is a clamp connection method, which is convenient and quick to disassemble from the engine.

[0041] In combination with the embodiment of the present invention, the air intake duct body 1 is made of carbon fiber composite material. The use of carbon fiber composite material makes the air intake measurement device light in weight and convenient for handling and installation. The air intake duct body 1 made of carbon fiber composite material has high strength and light weight, and is convenient for disassembly and assembly; the inner wall of the air intake duct body 1 should be polished and smooth to reduce the air intake boundary layer flow resistance of the engine, and it should not be painted to prevent pieces from falling off and endangering the safety of the engine.

[0042] Working principle:

[0043] When the present invention is used, the bracket 7 is placed on one side of the air intake of the engine to be tested, a slide rail 8 is arranged on the bracket 7, a sliding frame 9 is slidably mounted on the slide rail 8, and a support rod 6 is mounted on the sliding frame 9, which is fixedly connected to the sliding frame 9 through the second base 63 of the support rod 6, a handle 61 is threadedly connected to the second base 63, a first base 62 is threadedly mounted on the other end of the handle 61, a metal clamp is arranged on the first base 62, a rubber pad is arranged on the inner side of the metal clamp, and the rubber pad is used to prevent the metal clamp from damaging the air intake duct body 1, and the air intake duct body 1 can move along the axial direction of the air intake duct body 1, that is, slide in the metal clamp of the first base 62, and then the distance and position between the air intake duct body 1 and the engine can be adjusted, so as to facilitate the connection between the air intake duct body 1 and the engine; a measuring seat 4 is arranged on the outer surface of the air intake duct body 1, and a pressure sensor and a temperature sensor are installed in the measuring seat 4, which are used to measure the dimensions and pressure inside the air intake duct body 1 in real time;

[0044] The first mesh cover 51 and the second mesh cover 52 both include a semicircular frame 511 and a semicircular frame 512, which are connected by a connecting rod 513, and a metal mesh is wrapped on the outer side of the semicircular frame 511 and the semicircular frame 512 and between the semicircular frame 511 and the semicircular frame 512. The first mesh cover 51 and the second mesh cover 52 are fixedly connected by a buckle 53, and the first mesh cover 51 and the second mesh cover 52 are buckled and installed at the outlet of the air inlet main body 1, and the outlet is surrounded to prevent dust from entering; the first mesh cover 51 and the second mesh cover 52 are both installed on the sliding frame 9 by the buckle 53, and the movement of the sliding frame 9 drives the air inlet main body 1 and the air inlet mesh cover 5 to move synchronously, thereby realizing the adjustment of the position;

[0045] An air inlet adapter section 2 is provided at the connection end between the air inlet main body 1 and the engine, and an e-type sealing ring 31 is installed between the air inlet adapter section 2 and the air inlet main body 1. The opening of the e-type sealing ring 31 faces the air inlet mesh cover 5, one end of the e-type sealing ring 31 is fixedly connected to the outer surface of the air inlet adapter section 2, and the other end is sealedly connected to the inner surface of the air inlet main body 1 (at this time, the e-type sealing ring 31 is compressed, so that the e-type sealing ring 31 is in sealing contact with the inner surface of the air inlet main body 1), and the air inlet adapter section 2 can swing inside the air inlet main body 1, thereby reducing the vibration of the engine; a connecting ring 10 is provided on the outer side of the air inlet adapter section 2 away from one end of the air inlet main body 1, and the connecting ring 10 is connected to the engine air inlet. The connecting ring 10 is a clamp, thereby enabling quick connection and disconnection.

[0046] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air intake measurement device suitable for testing a high-power turboshaft engine, characterized in that: It comprises an air intake duct body (1), one end of which is connected to an air intake duct transition section (2) via a soft connection section (3), and the other end of which is installed with an air intake mesh cover (5); A measuring seat (4) is provided on the outer surface of the air inlet main body (1) near the air inlet mesh cover (5), and a measuring sensor is installed in the measuring seat (4); The soft connection section (3) comprises an E-type sealing ring (31), and the E-type sealing ring (31) is installed between the air inlet duct body (1) and the air inlet duct transition section (2); the E-type sealing ring (31) is hollow, and one end is sealedly connected to the inner surface of the air inlet duct body (1), and the other end is sealedly fitted to the outer surface of the air inlet duct transition section (2).

2. The air intake measurement device for high-power turboshaft engine testing according to claim 1, characterized in that: The opening of the E-shaped sealing ring (31) is located on a side of the air inlet duct body (1) away from the air inlet mesh cover (5).

3. An air intake measurement device suitable for testing a high-power turboshaft engine according to claim 1 or 2, characterized in that: The flexible connection section (3) further comprises a retaining ring (32), wherein the retaining ring (32) is mounted on one end of the air inlet duct body (1) away from the air inlet mesh cover (5), and the inner diameter of the retaining ring (32) is greater than the outer diameter of the E-type sealing ring (31); the retaining ring (32) is located on a side of the E-type sealing ring (31) away from the air inlet duct body (1).

4. The air intake measurement device for high-power turboshaft engine testing according to claim 1, characterized in that: The air intake mesh cover (5) comprises a first mesh cover (51) and a second mesh cover (52), wherein the first mesh cover (51) and the second mesh cover (52) are spliced ​​together to wrap around an end of the air intake duct body (1) away from the air intake duct transition section (2).

5. The air intake measurement device for high-power turboshaft engine testing according to claim 4, characterized in that: The first mesh cover (51) comprises a semicircular frame (511), a semicircular frame (512) and a connecting rod (513); the semicircular frame (511) and the semicircular frame (512) are connected via the connecting rod (513); and the outer surface of the semicircular frame (511), the outer surface of the semicircular frame (512) and the outer surface between the semicircular frame (511) and the semicircular frame (512) are wrapped with a metal mesh.

6. The air intake measurement device for high-power turboshaft engine testing according to claim 1, characterized in that: The air intake measurement device also includes a bracket (7), on which a slide rail (8) is arranged; a sliding frame (9) is slidably mounted on the slide rail (8), and the sliding frame (9) is connected to the air intake duct body (1) via a support rod (6); and the air intake mesh cover (5) is connected to the sliding frame (9).

7. The air intake measurement device for high-power turboshaft engine testing according to claim 6, characterized in that: The support rod (6) comprises a handle (61), a first base (62) connected to the air inlet duct body (1), and a second base (63) connected to the sliding frame (9); two ends of the handle (61) are respectively threadedly connected to the first base (62) and the second base (63).

8. The air intake measurement device for high-power turboshaft engine testing according to claim 7, characterized in that: The outer surfaces of both ends of the handle (61) are respectively provided with different-direction threads.

9. The air intake measurement device for high-power turboshaft engine testing according to claim 1, characterized in that: A connecting ring (10) is arranged on the outer side of one end of the air inlet duct transition section (2) away from the air inlet duct main body (1), and the connecting ring (10) is connected to the engine.

10. The air intake measurement device for high-power turboshaft engine testing according to claim 1, characterized in that: The air inlet duct body (1) is made of carbon fiber composite material.

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