An aerodynamic simulation system for an indoor test bench of an aircraft engine

Abstract

The present invention discloses an aerodynamic simulation system for an indoor test bench of an aviation engine, and relates to the technical field of engine test. The system comprises a simulated air intake device, a test bench body, a simulated exhaust device, a bracket and a simulated engine, wherein the left end of the test bench body is provided with a simulated air intake device, and the right end of the test bench body is provided with a simulated exhaust device, wherein the simulated air intake device comprises an air intake bell mouth, wherein the outer wall of the air intake bell mouth is fixedly connected with a transition section, and the right outer wall of the transition section is fixedly connected with a connecting section, and the inner wall of the connecting section is fixedly connected with a partition, and the inner walls of the front and rear sides of the partition are respectively rotatably connected with a first rotating shaft and a second rotating shaft. Based on the low cost and repeatability of the model test, it is convenient to design and study the performance test of certain test benches, and it is convenient to explore the influence of the inherent structure in the test bench on the airflow. Through this scheme, a preliminary experiment before the formal test can be realized, and a qualitative judgment can be made on the exploration problem.

Description

Technical Field

[0001] The invention belongs to the technical field of engine test running, and in particular relates to a pneumatic simulation system of an indoor test bench for an aviation engine. Background Art

[0002] Aircraft engines need to undergo bench testing to verify their thrust and other performance indicators during development, production or factory overhaul. Many engine performance tests are often carried out on indoor test benches.

[0003] When the engine is tested under indoor conditions, its air intake field is easily affected by the test bench, so it is impossible to obtain accurate test results. Due to the above reasons, the current indoor test of the engine must fully consider the requirements of aerodynamics. As the size and air flow of the engine continue to increase, the flow and size of the test bench are also required to be larger. Since some performance tests have certain unpredictability, such as directly testing on the designed test bench, the number of engine tests that can be arranged is greatly limited, the test cost is increased, and the test plan arrangement is easily disrupted, and even unpredictable potential impacts on the engine test are generated. To this end, an aerodynamic simulation system for an indoor test bench for aircraft engines is proposed to solve the defects of the above technologies. Summary of the invention

[0004] The purpose of the present invention is to provide an aerodynamic simulation system for an indoor test bench of an aircraft engine in view of the existing problems, thereby solving the technical problems raised in the background technology.

[0005] The present invention is realized by the following technical scheme: an aerodynamic simulation system of an indoor test bench of an aviation engine, comprising a simulated air intake device, a test bench body, a simulated exhaust device, a bracket and a simulated engine, wherein the simulated air intake device is arranged at the left end of the test bench body, and the simulated exhaust device is arranged at the right end of the test bench body;

[0006] The simulated air intake device includes an air intake bell mouth, the outer wall of the air intake bell mouth is fixedly connected with a transition section, the right outer wall of the transition section is fixedly connected with a connecting section, the inner wall of the connecting section is fixedly connected with a partition, the front and rear inner walls of the partition are respectively rotatably connected with a first rotating shaft and a second rotating shaft, the outer wall of the first rotating shaft is fixedly connected with a first guide vane, the outer wall of the second rotating shaft is fixedly connected with a second guide vane, the front end of the first rotating shaft is fixedly connected with a first transmission member, the rear end of the second rotating shaft is fixedly connected with a second transmission member, and the first transmission member and the second transmission member are both arranged on the outside of the connecting section.

[0007] Preferably, the test chamber body is composed of a plurality of box-type structures, on which an axial flange and an ear-type flange are provided, the axial flange and the ear-type flange are vertically arranged, and the axial flange and the ear-type flange are fixedly connected by bolts.

[0008] Preferably, the simulated exhaust device includes an exhaust pipe, a guide basin is provided at the left end of the exhaust pipe, a connecting plate is fixedly connected to the left end of the guide basin, and an outer wall of the connecting plate on a side away from the guide basin is fixedly connected to the right end of the test chamber body.

[0009] Preferably, a blocking cone is provided at the right end of the exhaust pipe, and the blocking cone is arranged on a bracket.

[0010] Preferably, the bracket includes a base plate, the top outer wall of the base plate is fixedly connected to a first screw rod, the outer wall of the first screw rod is threadedly connected to a cone blocking arm, the left end of the cone blocking arm is fixedly connected to a second screw rod, the inner wall of the cone blocking is provided with a threaded groove, and the outer wall of the second screw rod is threadedly connected to the inner wall of the threaded groove.

[0011] Preferably, observation windows are symmetrically provided on the outer wall of the box-type structure, and an inlet pipe of a smoke generating device is fixedly connected to the bottom of the box-type structure.

[0012] Preferably, the simulated engine comprises a cabin, the left end of the cabin is fixedly connected to an air intake duct, the outer wall of the cabin is fixedly connected to an air extraction pipe and an air supply pipe, and the right end of the cabin is fixedly connected to a nozzle.

[0013] The beneficial effects of the present invention are:

[0014] 1. The present invention provides an aerodynamic simulation system for an indoor test bench of an aircraft engine. Based on the low cost and repeatability of model tests, it is convenient to design and study performance tests on certain test benches, and to explore the influence of the inherent structure in the test bench on the airflow. Through this scheme, preliminary experiments can be carried out before formal tests, and qualitative judgments can be made on the research issues.

[0015] 2. The present invention provides an aerodynamic simulation system for an indoor test bench of an aircraft engine. The device simulates an air intake device through adjustable guide vanes, which can not only play a rectifying role, but also create a vector air intake environment for the test room. The adjustable blocking cone in the simulated exhaust device can control the flow rate of the test room by changing the outlet area. The operation is simple and easy to control.

[0016] 3. The present invention provides a pneumatic simulation system for an indoor test bench of an aircraft engine, which utilizes air extraction or air supply to simulate the engine and can change the working conditions within a certain range. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a working principle diagram of the present invention;

[0018] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 3 It is a structural schematic diagram of the simulated air intake device of the present invention;

[0020] Figure 4 It is a structural schematic diagram of the simulated exhaust device of the present invention;

[0021] Figure 5 It is a schematic diagram of the structure of the ear-type flange of the present invention;

[0022] Figure 6 It is a schematic diagram of the structure of the main body of the test workshop of the present invention;

[0023] Figure 7 It is a structural schematic diagram of a simulated engine of the present invention.

[0024] In the figure: 1. simulated air intake device; 101. air intake bell mouth; 102. transition section; 103. connecting section; 104. first transmission member; 105. partition; 106. first rotating shaft; 107. second rotating shaft; 108. first guide vane; 109. second guide vane; 110. second transmission member; 2. test chamber body; 201. observation window; 202. smoke generating device inlet pipe; 203. ear flange; 204. axial flange; 3. simulated exhaust device; 301. exhaust pipe; 302. connecting plate; 303. guide basin; 4. bracket; 401. bottom plate; 402. first screw rod; 403. blocking cone arm; 404. blocking cone; 405. second screw rod; 5. simulated engine; 501. air intake duct; 502. cabin; 503. nozzle; 504. exhaust pipe; 505. air supply pipe. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0026] Embodiment 1:

[0027] See also Figure 1-7As shown, the present invention provides a technical solution: an aerodynamic simulation system of an indoor test bench for an aircraft engine, comprising a simulated air intake device 1, a test bench body 2, a simulated exhaust device 3, a bracket 4 and a simulated engine 5, wherein the simulated air intake device 1 is arranged at the left end of the test bench body 2, and the simulated exhaust device 3 is arranged at the right end of the test bench body 2;

[0028] The simulated air intake device 1 includes an air intake bell mouth 101, the outer wall of the air intake bell mouth 101 is fixedly connected with a transition section 102, the right outer wall of the transition section 102 is fixedly connected with a connecting section 103, the inner wall of the connecting section 103 is fixedly connected with a partition 105, the inner walls of the front and rear sides of the partition 105 are rotatably connected with a first rotating shaft 106 and a second rotating shaft 107 respectively, the outer wall of the first rotating shaft 106 is fixedly connected with a first guide vane 108, the outer wall of the second rotating shaft 107 is fixedly connected with a second guide vane 109, the front end of the first rotating shaft 106 is fixedly connected with a first transmission member 104, the rear end of the second rotating shaft 107 is fixedly connected with a second transmission member 110, and the first transmission member 104 and the second transmission member 110 are both arranged on the outer side of the connecting section 103;

[0029] The test chamber body 2 is composed of a plurality of box structures, on which an axial flange 204 and an ear flange 203 are arranged, the axial flange 204 and the ear flange 203 are arranged vertically, and the axial flange 204 and the ear flange 203 are fixedly connected by bolts;

[0030] The simulated exhaust device 3 includes an exhaust pipe 301, a guide basin 303 is provided at the left end of the exhaust pipe 301, a connecting plate 302 is fixedly connected to the left end of the guide basin 303, an outer wall of the connecting plate 302 on one side away from the guide basin 303 is fixedly connected to the right end of the test chamber body 2, a blocking cone 404 is provided at the right end of the exhaust pipe 301, and the blocking cone 404 is arranged on the bracket 4, the bracket 4 includes a bottom plate 401, a first screw rod 402 is fixedly connected to the top outer wall of the bottom plate 401, a blocking cone arm 403 is threadedly connected to the outer wall of the first screw rod 402, a second screw rod 405 is fixedly connected to the left end of the blocking cone arm 403, a threaded groove is provided on the inner wall of the blocking cone 404, and the outer wall of the second screw rod 405 is threadedly connected to the inner wall of the threaded groove;

[0031] The simulated engine 5 includes a cabin 502 , the left end of which is fixedly connected to an air intake duct 501 , the outer wall of which is fixedly connected to an air extraction pipe 504 and an air supply pipe 505 , and the right end of which is fixedly connected to a nozzle 503 .

[0032] In this embodiment, the simulated air intake device 1 is used to simulate the pneumatic conditions required for the inlet of the test workshop. The simulated air intake device 1 is composed of an air intake bell mouth 101, a transition section 102, and a connecting section 103. The air intake bell mouth 101, the transition section 102 and the connecting section 103 have a smooth transition along the transverse axis, which can effectively reduce the flow loss. By twisting the first transmission member 104 and the second transmission member 110 to rotate, the first guide vane 108 and the second guide vane 109 can be driven to rotate respectively. This process can not only play a rectifying role, but also create a vector air intake environment for the test workshop. The test workshop body 2 can be based on the size ratio of the actual test workshop. The test chamber body 2 is configured as follows: the test chamber body 2 is composed of several groups of box-type structures, each group of box-type structures is connected and sealed by an ear-type flange 203 and an axial flange 204, and the ear-type flange 203 and the axial flange 204 can be fixed together by connecting bolts and nuts. This combination is not only simpler in processing, but also conducive to the disassembly and assembly of the test piece, and the axial length of the test chamber body 2 can be changed with the number of box-type structures, which is convenient for adjusting the axial distance for different test chambers, paving the way for the exploration experiment; the simulated exhaust device 3 is used to simulate the pneumatic conditions of the indoor test bench ejector tube, and its front end is connected to the test chamber body 2 The exhaust pipe 301 on the simulated exhaust device 3 is a straight section of a circular tube, and its inlet is connected to the test chamber body 2 through a flange. A bracket 4 is arranged at the tail of the exhaust pipe 301. During use, the blocking cone 404 can be moved by adjusting the blocking cone arm 403, and the effective outflow area of ​​the exhaust pipe 301 can be adjusted by rotating the blocking cone 404; the simulated engine 5 provides power to the test chamber through the engine, so that a flowing airflow is generated in the test chamber body 2. With the cooperation of the simulated air intake device 1 and the simulated exhaust device 3, the desired pneumatic conditions are achieved in the test chamber body 2. The simulated engine 5 uses air extraction or air supply The airflow in the test workshop is accelerated. The structure is simple and the working conditions can be changed within a certain range. The flow effect is simulated by the engine using air extraction or air supply. This method has certain requirements on the external air source conditions, but reduces the complex mechanical flow inside the engine. Moreover, more test conditions can be simulated by changing the external air source conditions. When air is extracted, a low-pressure area is formed in the air intake duct 501, and a flow pattern similar to that of the actual test workshop can be formed around the air intake duct 501. When air is supplied, the airflow is ejected from the nozzle 503 at high speed, driving the surrounding airflow to accelerate into the exhaust pipe 301, which is also the power source of the airflow in the test workshop.

[0033] Embodiment 2:

[0034] See also Figure 2-6 As shown, based on the first embodiment, the present invention provides a technical solution: observation windows 201 are symmetrically provided on the outer wall of the box-type structure, and a smoke generating device inlet pipe 202 is fixedly connected to the bottom of the box-type structure.

[0035] In this embodiment, through the observation window 201 on the side of the box-type structure of the test chamber body 2 and the smoke generating device inlet pipe 202 at the bottom of the box-type structure, certain flow phenomena can be observed more clearly during the test, which facilitates the measurement of flow parameters.

[0036] Working principle: This device provides power to the test room through the engine, so that a flowing airflow is generated in the test room body 2. With the cooperation of the simulated air intake device 1 and the simulated exhaust device 3, the required aerodynamic conditions are achieved in the test room body 2. The simulated engine 5 accelerates the airflow in the test room by exhausting or supplying air. It has a simple structure and can change the working conditions within a certain range. The engine simulates the flow effect by exhausting or supplying air. This method has certain requirements for external air source conditions, but reduces the complex mechanical flow inside the engine. Moreover, more test conditions can be simulated by changing the external air source conditions. The design method of splitting the structure into components and then connecting them with flanges and bolts and nuts reduces the complexity of processing. It has certain convenience in engineering practice. The aerodynamic characteristics of the test bench can be basically mastered before the formal test begins, which greatly reduces the test risk. At the same time, for some exploratory problems in the test room, predictions can be made in advance through experiments.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An aerodynamic simulation system for an indoor test bench of an aircraft engine, comprising a simulated air intake device (1), a test bench body (2), a simulated exhaust device (3), a bracket (4) and a simulated engine (5), characterized in that: The left end of the test chamber body (2) is provided with a simulated air intake device (1), and the right end of the test chamber body (2) is provided with a simulated exhaust device (3); The simulated air intake device (1) comprises an air intake bell mouth (101), the outer wall of the air intake bell mouth (101) is fixedly connected with a transition section (102), the right outer wall of the transition section (102) is fixedly connected with a connecting section (103), the inner wall of the connecting section (103) is fixedly connected with a partition (105), the inner walls of the front and rear sides of the partition (105) are rotatably connected with a first rotating shaft (106) and a second rotating shaft (107), the outer wall of the first rotating shaft (106) is fixedly connected with a first guide vane (108), the outer wall of the second rotating shaft (107) is fixedly connected with a second guide vane (109), the front end of the first rotating shaft (106) is fixedly connected with a first transmission member (104), the rear end of the second rotating shaft (107) is fixedly connected with a second transmission member (110), and the first transmission member (104) and the second transmission member (110) are both arranged on the outer side of the connecting section (103); The simulated exhaust device (3) comprises an exhaust pipe (301), a guide basin (303) is arranged at the left end of the exhaust pipe (301), a connecting plate (302) is fixedly connected to the left end of the guide basin (303), an outer wall of the connecting plate (302) away from the guide basin (303) is fixedly connected to the right end of the test chamber body (2), and a blocking cone (404) is arranged at the right end of the exhaust pipe (301), and the blocking cone (404) is arranged on the bracket (4); The support (4) comprises a bottom plate (401), the top outer wall of the bottom plate (401) is fixedly connected to a first screw rod (402), the outer wall of the first screw rod (402) is threadedly connected to a cone blocking arm (403), the left end of the cone blocking arm (403) is fixedly connected to a second screw rod (405), the inner wall of the cone blocking (404) is provided with a thread groove, and the outer wall of the second screw rod (405) is threadedly connected to the inner wall of the thread groove; The simulated engine (5) comprises a cabin (502), the left end of the cabin (502) is fixedly connected to an air intake duct (501), the outer wall of the cabin (502) is fixedly connected to an air extraction pipeline (504) and an air supply pipeline (505), and the right end of the cabin (502) is fixedly connected to a nozzle (503).

2. The aerodynamic simulation system of an indoor test bench for an aircraft engine according to claim 1, characterized in that: The test chamber body (2) is composed of a plurality of box-type structures, on which an axial flange (204) and an ear-type flange (203) are arranged, the axial flange (204) and the ear-type flange (203) being arranged vertically, and the axial flange (204) and the ear-type flange (203) being fixedly connected by bolts.

3. The aerodynamic simulation system of an indoor test bench for an aircraft engine according to claim 2, characterized in that: The outer wall of the box-type structure is symmetrically provided with observation windows (201), and the bottom of the box-type structure is fixedly connected to an inlet pipe (202) of a smoke generating device.

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