Square sliding rail aero-engine crosswind test bed and test method

Abstract

The invention provides a square slide rail aero-engine crosswind test bench and test method, the crosswind test bench comprises a crosswind generating device and a square ground fixed slide rail, the crosswind generating device comprises a crosswind generator, a planetary gearbox, a base and a pulley, and the crosswind generating device can provide test air flow required by a test; a planetary gearbox is arranged at the bottom of the crosswind generator, so that the orientation of the crosswind generator can be freely changed; the base is connected below the planetary gearbox; a pulley is arranged on the base, so that the crosswind generating device can move on the square ground fixed sliding rail; and the square ground fixed sliding rail is matched with the pulley so that the crosswind generating device can horizontally slide on one side of the tested engine. According to the crosswind test bench, horizontal sliding of the crosswind generating device in a positive crosswind test can be realized, so that wind field requirements of engines with different sizes can be met. The test method can improve the stability of the test and the reliability of the test result, and the test process is simple and easy to operate.

Description

Technical Field

[0001] The invention relates to the technical field of aero-engine testing, and in particular to a square slide rail aero-engine crosswind test bench and a testing method. Background Art

[0002] Crosswind is formed by the flow of air in the atmospheric environment, and is wind with a certain angle to the air intake direction of the aircraft engine. When the engine is running under crosswind conditions, an intake distortion flow field is formed at its inlet, which may cause abnormal working phenomena such as compressor surge, combustion chamber flameout, and exhaust overheating. The aircraft engine crosswind test can effectively evaluate the aircraft engine's ability to work stably under crosswind conditions and determine its operating envelope. It is an important assessment subject in environmental testing.

[0003] The currently available sidewind generating devices include circular slide rail type, which can rotate around the engine along the circular slide rail to adjust the direction of the sidewind, conduct sidewind tests at different angles, or slide to the tail of the engine to conduct tailwind tests.

[0004] The circular slide rail side wind generating device has the advantages of stable structure and easy wind field calibration. However, each time the wind direction changes, the side wind generating device needs to be moved. Due to its huge size, it often takes a long time to move and recalibrate, which greatly increases the time cost for large and frequent R&D tests.

[0005] Moreover, the compatibility with engine size is poor. For example, when a crosswind test bench designed for a large engine is conducting a direct crosswind test on a small engine, the engine lip position is often far away from the core area of ​​the wind field because the positions of the bench hanging system and the crosswind generating device are relatively fixed. As a result, the wind speed does not meet the test requirements and the uniformity of the test wind field is poor.

[0006] In view of this, the inventor of the present application has designed a square slide rail aircraft engine side wind test bench and test method in order to overcome the above technical problems. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the defects in the prior art that, when conducting a small engine positive crosswind test, the engine lip position is often far away from the core area of ​​the wind field, resulting in the wind speed failing to meet the test requirements and poor uniformity of the test wind field, because the positions of the test bench hanging system and the crosswind generating device are relatively fixed. A square slide rail aircraft engine crosswind test bench and test method are provided.

[0008] The present invention solves the above technical problems through the following technical solutions:

[0009] The present invention provides a square slide rail aero-engine sidewind test bench, which is characterized in that the sidewind test bench comprises a sidewind generating device and a square ground fixed slide rail, the sidewind generating device comprises a sidewind generator, a planetary gear box, a base and a pulley, the sidewind generating device can provide the test air flow required for the test; the planetary gear box is arranged at the bottom of the sidewind generator, so that the direction of the sidewind generator can be freely changed; the base is connected below the planetary gear box; the pulley is arranged on the base, so that the sidewind generating device can move on the square ground fixed slide rail; the square ground fixed slide rail cooperates with the pulley to realize the horizontal sliding of the sidewind generating device on one side of the test engine.

[0010] According to one embodiment of the present invention, the crosswind test bench further comprises a ground effect simulation board, and the ground effect simulation board is arranged at the bottom of the tested aircraft engine.

[0011] According to one embodiment of the present invention, a drive motor is provided on the base of the side wind generating device, which is connected to the power input shaft of the planetary gear box to provide power for the planetary gear box; the drive motor provides power to drive the side wind generating device to move on the square ground fixed slide rail.

[0012] According to one embodiment of the present invention, the side wind generator includes a compression fan and a casing, and the compression fan includes a plurality of compression fans arranged inside the casing for compressing the airflow to provide the test air flow required for the test.

[0013] According to one embodiment of the present invention, the casing includes a compression straight section, a transition section and an air outlet which are connected in sequence, and the transition section adopts a convergent outlet form.

[0014] According to one embodiment of the present invention, the compressed straight section and the air outlet are regular polygons or circles.

[0015] According to one embodiment of the present invention, the planetary gearbox includes a ring gear, a sun gear, planetary gears, a planet carrier and a power input shaft; the sun gear is connected to the power input shaft, and is powered by the drive motor through the power input shaft; the planetary gear is arranged between the sun gear and the ring gear, and is meshed with the sun gear and the ring gear, and is driven by the sun gear to drive the ring gear to rotate; the shaft of the planetary gear is fixedly mounted on the planet carrier; the ring gear is fixedly connected to the bottom of the side wind generator.

[0016] According to one embodiment of the present invention, the outer ring of the gear ring is provided with a flange edge, and the flange edge is provided with a threaded hole, and the threaded hole cooperates with the bolt so that the gear ring is fixedly connected to the bottom of the side wind generator.

[0017] The present invention also provides a test method for studying the influence of different sidewind directions on the aerodynamic stability of an engine, using the square slide rail aircraft engine sidewind test bench as described above, and the test method is specifically as follows: by adjusting the position of the sidewind generating device to the left side of the aircraft engine being tested, the influence of the positive sidewind or the wind direction with an angle on the left side on the aerodynamic stability of the fan is studied; by adjusting the position of the sidewind generating device to the right side of the aircraft engine being tested, the influence of the positive sidewind or the wind direction with an angle on the right side on the aerodynamic stability of the fan is studied; by adjusting the position of the sidewind generating device to the rear of the aircraft engine being tested, the influence of tail wind on the engine starting process is studied.

[0018] The present invention also provides a test method for an airframe simulation test device, using the square slide rail aircraft engine crosswind test bench as described above, comprising the following steps: Step S 1 , before the test, place the airframe simulation device between the crosswind generating device and the aircraft engine under test; step S 2 , turn on the crosswind generator, and start the aircraft engine under test to slow speed; step S 3 2. Carry out steady-state and acceleration / deceleration tests from slow to take-off conditions; Step S 4 , the aircraft engine under test returns to slow speed stability; step S 5 , turn off the side wind generator; step S 6 , the test aircraft engine shuts down.

[0019] The positive and progressive effects of the present invention are:

[0020] The square slide rail aero-engine crosswind test bench and test method of the present invention have at least the following advantages:

[0021] The square slide rail aero-engine sidewind test bench of the present invention adopts a combination of a planetary gearbox and a square ground-fixed slide rail to achieve the purpose of adjusting the position and rotation angle of the sidewind generator, so that the test bench has the ability to adjust the wind direction with two degrees of freedom. Through the planetary gearbox, the sidewind generating device can rotate 360° in situ, greatly shortening the time for adjusting the wind direction; through the ground-fixed square slide rail, the relative position of the sidewind generating device and the engine is changed, and the sidewind generating device of the positive sidewind test can slide horizontally to meet the wind field requirements of engines of different sizes, and it also has the mode switching ability of the sidewind test and the tailwind test.

[0022] The test method of the airframe simulation test device of the present invention can improve the stability of the test and the reliability of the test result, and the test process is simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always represent the same features, wherein:

[0024] Figure 1 It is a schematic diagram of the square slide rail aero-engine crosswind test bench of the present invention.

[0025] Figure 2 It is a schematic diagram of a side wind generating device in a square slide rail aero-engine side wind test bench of the present invention.

[0026] Figure 3A It is a schematic diagram of a side wind generator in a square slide rail aero-engine side wind test bench of the present invention.

[0027] Figure 3B yes Figure 3A AA cross-sectional view of .

[0028] Figure 3C yes Figure 3A BB cross-sectional view.

[0029] Figure 4 It is a schematic diagram of a planetary gearbox (excluding a planet carrier) in a square slide rail aero-engine crosswind test bench of the present invention.

[0030] Figure 5 It is a schematic diagram of a planetary gearbox (including a planet carrier) in a square slide rail aero-engine crosswind test bench of the present invention.

[0031] Figure 6 It is a schematic diagram of the position of the fan for studying the influence of the left side wind in the test method for studying the influence of different side wind directions on the aerodynamic stability of the engine of the present invention.

[0032] Figure 7 It is a schematic diagram of the position of the fan for studying the influence of right side wind in the test method for studying the influence of different side wind directions on the aerodynamic stability of the engine of the present invention.

[0033] Figure 8 It is a schematic diagram of the fan position for studying the influence of tail wind in the test method for studying the influence of different crosswind directions on the aerodynamic stability of the engine according to the present invention.

[0034] Fig. 9A It is a front view schematic diagram of an airframe simulation device in an airframe simulation test device test method of the present invention.

[0035] Fig. 9B yes Fig. 9A AA cross-sectional view of .

[0036] Fig.10 It is a schematic diagram of the use of the body simulation device in the test method of the body simulation test device of the present invention.

[0037] [Reference Signs]

[0038] Crosswind generating device 100

[0039] Crosswind Generator 110

[0040] Compressor fan 111

[0041] Receiver 112

[0042] Compressed straight section 113

[0043] Transition section 114

[0044] Air outlet 115

[0045] Planetary gearbox 120

[0046] Power input shaft 121

[0047] Ring gear 122

[0048] Sun gear 123

[0049] Planetary gear 124

[0050] Planet carrier 125

[0051] Flange 126

[0052] Threaded hole 127

[0053] Base 130

[0054] Pulley 140

[0055] Drive motor 150

[0056] Square floor fixed slide rail 200

[0057] Ground Effect Simulator 300

[0058] Tested aircraft engine 400

[0059] Aircraft Simulator 500 DETAILED DESCRIPTION

[0060] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0061] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to preferred embodiments of the present invention, examples of which are shown in the accompanying drawings. Wherever possible, the same reference numerals will be used in all drawings to represent the same or similar parts. In addition, although the terms used in the present invention are selected from well-known and commonly used terms, some of the terms mentioned in the specification of the present invention may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description herein. In addition, it is required to understand the present invention not only by the actual terms used, but also by the meaning implied by each term.

[0062] like Figure 1 As shown, the present invention provides a square slide rail aircraft engine sidewind test bench, comprising a sidewind generating device 100 and a square ground fixed slide rail 200.

[0063] The side wind generating device 100 includes a side wind generator 110, a planetary gear box 120, a base 130 and a pulley 140. The side wind generating device 100 can provide the test air flow required for the test; the planetary gear box 120 is arranged at the bottom of the side wind generator 110, so that the direction of the side wind generator 110 can be freely changed; the base 130 is connected under the planetary gear box 120; the pulley 140 is arranged on the base 130, so that the side wind generating device 100 can move on the square ground fixed slide rail 200.

[0064] The square ground fixed slide rail 200 cooperates with the pulley 140 to enable the side wind generating device 100 to slide horizontally on one side of the tested engine.

[0065] The pulley 140 is installed on the base 130 of the side wind generating device 100 and is embedded in the square ground fixed slide rail 200 to drive the side wind generating device 100 to move in the Figure 1 The middle left side (side wind test position) moves horizontally to adapt to the wind field requirements of engines of different sizes, and at the same time moves circumferentially around the entire test platform to adapt to the tail wind field requirements.

[0066] The square slide rail aero-engine sidewind test bench of the present invention adopts a combination of a planetary gearbox 120 and a square ground fixed slide rail 200 to adjust the position and rotation angle of the sidewind generator 110, so that the test bench has the ability to adjust the wind direction with two degrees of freedom, and the positive sidewind test can meet the wind field requirements of engines of different sizes.

[0067] like Figure 1 As shown, as a preferred embodiment of the square slide rail aircraft engine crosswind test bench of the present invention, the crosswind test bench also includes a ground effect simulation board 300, and the ground effect simulation board 300 is arranged at the bottom of the aircraft engine 400 under test.

[0068] In aircraft engine bench tests, the mounting height of the aircraft engine is much greater than the actual mounting height after service, so it is impossible to directly simulate the aerodynamic instability conditions of the aircraft engine caused by the ground vortex effect.

[0069] The main function of the ground effect simulation board 300 is to simulate the distance between the aircraft engine nacelle and the ground in a real mounting scenario, so that the test results are closer to the actual working conditions.

[0070] The ground effect simulation board 300 is preferably rectangular, and its area should be larger than the projection area of ​​the aircraft engine on the ground. The installation position should include the projection area of ​​the aircraft engine on the ground, and it has the ability to adjust the height according to the installation height of different aircraft engines.

[0071] like Figure 2 As shown, as a preferred embodiment of the square slide rail aircraft engine sidewind test bench of the present invention, a drive motor 150 is arranged on the base 130 of the sidewind generating device 100, which is connected to the power input shaft 121 of the planetary gear box 120 to provide power for the planetary gear box 120; the drive motor 150 provides power to drive the sidewind generating device 100 to move on the square ground fixed slide rail 200.

[0072] The pulley 140 is mounted on the base 130 of the side wind generating device 100 and is embedded in the square ground fixed slide rail 200. The drive motor 150 provides power to drive the side wind generating device 100 to move in the Figure 1 The middle left side (side wind test position) moves horizontally to adapt to the wind field requirements of engines of different sizes, and at the same time moves circumferentially around the entire test platform to adapt to the tail wind field requirements.

[0073] like Figure 3A to Figure 3C As shown, as a preferred embodiment of the square slide rail aircraft engine sidewind test bench of the present invention, the sidewind generator 110 includes a compression fan 111 and a casing 112. The compression fan 111 includes a plurality of compression fans, which are arranged inside the casing 112 and are used to compress the airflow to provide the test air flow required for the test.

[0074] like Figure 3A to Figure 3C As shown, as a preferred embodiment of the square slide rail aircraft engine crosswind test bench of the present invention, the casing 112 includes a compression straight section 113, a transition section 114 and an air outlet 115 connected in sequence, and the transition section 114 adopts a convergent outlet form.

[0075] The transition section 114 adopts a convergent outlet form, that is, the cross-sectional area at the connection between the transition section 114 and the compressed straight section 113 is larger than the cross-sectional area at the connection between the transition section 114 and the air outlet 115, thereby accelerating the flow rate of the airflow.

[0076] like Figure 3B As shown, it is an AA cross-sectional view of the compressed straight section 113 . Since the cross-sectional areas at various locations in the compressed straight section 113 are equal, the cross-sectional area of ​​the AA cross-sectional view is equivalent to the cross-sectional area at the connection between the transition section 114 and the compressed straight section 113 .

[0077] like Figure 3C , which is a BB cross-sectional view of the air outlet 115 , and the cross-sectional area of ​​the BB cross-sectional view is equivalent to the cross-sectional area of ​​the connection between the transition section 114 and the air outlet 115 .

[0078] Combination Figure 3A , Figure 3B and Figure 3C It can be seen that the dual-degree-of-freedom side wind generating device 100 of the present invention is designed so that the cross-sectional area at the connection between the transition section 114 and the compressed straight section 113 is larger than the cross-sectional area at the connection between the transition section 114 and the air outlet 115 .

[0079] like Figure 3A to Figure 3C As shown, as a preferred embodiment of the square slide rail aircraft engine crosswind test bench of the present invention, the compression straight section 113 and the air outlet 115 are regular polygons or circles.

[0080] The regular polygonal compressed straight section 113 and the regular polygonal air outlet 115 may preferably be designed as a regular hexagon.

[0081] The main purpose of the side wind generator 110 is to generate a uniform wind field environment, which requires the airflow to be as uniform as possible and the flow rate range to be wider. Ideally, the circular air outlet 115 has the most uniform airflow, but it is not conducive to processing and ground fixing.

[0082] Therefore, by using a regular hexagonal compressed straight section 113, a regular hexagonal air outlet 115, and a transition section 114 in the form of a convergent outlet, a wider air flow speed can be obtained while reducing air flow losses, and it is more conducive to processing, manufacturing and fixing.

[0083] like Figure 4 and Figure 5 As shown, as a preferred embodiment of the square slide rail aircraft engine crosswind test bench of the present invention, the planetary gearbox 120 includes a ring gear 122, a sun gear 123, planetary gears 124, a planet carrier 125 and a power input shaft 121.

[0084] The sun gear 123 is connected to the power input shaft 121 , and is powered by the driving motor 150 through the power input shaft 121 .

[0085] The planetary gear 124 is disposed between the sun gear 123 and the ring gear 122 , and is meshedly connected with the sun gear 123 and the ring gear 122 . The planetary gear 124 is driven by the sun gear 123 to drive the ring gear 122 to rotate.

[0086] The shaft of the planetary gear 124 is fixedly mounted on the planetary carrier 125 .

[0087] The gear ring 122 is fixedly connected to the bottom of the side wind generator 110 .

[0088] like Figure 4 and Figure 5 As shown, as a preferred embodiment of the square slide rail aircraft engine side wind test bench of the present invention, the outer ring of the gear ring 122 is provided with a flange edge 126, and the flange edge 126 is provided with a threaded hole 127. The threaded hole 127 cooperates with the bolt to fix the gear ring 122 to the bottom of the side wind generator 110.

[0089] The square slide rail aero-engine sidewind test bench of the present invention combines a motor-driven planetary gearbox 120 and a square ground fixed slide rail 200 to achieve the purpose of adjusting the position and rotation angle of the sidewind generator 110, so that the test bench has the ability to adjust the wind direction with two degrees of freedom.

[0090] By driving the planetary gearbox 120 through a motor, the sidewind generating device 100 can rotate 360° on the spot, greatly shortening the time for adjusting the wind direction; by using the square ground fixed slide rail 200, the relative position of the sidewind generating device 100 and the engine is changed, and the sidewind generating device 100 can slide horizontally in a positive sidewind test to meet the wind field requirements of engines of different sizes, while also having the ability to switch modes between sidewind tests and tailwind tests.

[0091] The square slide rail aero-engine sidewind test bench of the present invention has the characteristics of flexible and stable adjustable wind field angle, higher applicability, high adjustment efficiency and simple structure, and at the same time has the ability of sidewind test and tailwind test, avoiding cost waste caused by repeated construction of sidewind test benches.

[0092] When conducting a side wind test, first, the pulley 140 is driven to fix the slide rail 200 along the square ground to adjust the side wind generating device 100 to a suitable horizontal position for the test. When the wind direction needs to be changed, the planetary gear box 120 is directly driven to rotate the side wind generating device 100 in situ to change to a suitable wind direction.

[0093] When conducting a tail wind test, the side wind generating device 100 is adjusted to the tail position of the engine by driving the pulley 140 along the square ground fixed slide rail 200.

[0094] By using the square ground fixed slide rail 200, the function switching between the side wind test and the tail wind test can be realized.

[0095] The crosswind is the wind with a non-zero vertical component encountered by the aircraft during takeoff or landing.

[0096] The tail wind is the wind in the same direction as the aircraft's forward direction that the aircraft encounters during takeoff or landing.

[0097] In summary, the square slide rail aircraft engine crosswind test bench of the present invention has the following advantages:

[0098] 1. Use a planetary gearbox 120. On the one hand, the planetary gearbox 120 is driven by a motor, which can make the side wind generating device 100 rotate 360 ​​degrees in situ, so that there is no need to adjust the position of the base 130 of the side wind generating device 100, and the wind field angle can be adjusted, which greatly shortens the time for adjusting the wind direction; on the other hand, compared with similar ordinary gearboxes, the planetary gearbox 120 has the characteristics of stable transmission and large bearing capacity, which can meet the requirements of the stable rotation of the huge side wind device;

[0099] Second, the square ground fixed slide rail 200 is used. The base 130 of the sidewind generating device 100 can be driven by a motor to move along the ground fixed square slide rail, thereby changing the relative position of the sidewind generating device 100 and the engine, and realizing the horizontal sliding of the sidewind generating device 100 in the positive sidewind test to meet the wind field requirements of engines of different sizes, and also having the mode switching capability of the sidewind test and the tailwind test.

[0100] The square slide rail aero-engine crosswind test bench of the present invention has the function of studying the influence of different crosswind directions on the engine. Usually, the rotation direction of the engine rotor is certain, but the incoming direction of the crosswind may be on both sides of the engine. The influence brought by different wind directions may cause different types of intake distortion, thereby coupling with the fan blades to produce different instability problems; in the installed state, the engine may be disturbed by the airflow from the aircraft body, thereby generating body vortices and causing aerodynamic instability of the fan.

[0101] Therefore, the present invention also discloses a test method for studying the influence of different crosswind directions on the aerodynamic stability of the engine. Figure 6 to Figure 8 As shown, the specific implementation method is:

[0102] (1) Figure 6 As shown, by adjusting the position of the side wind generating device 100 to the left side of the aircraft engine 400 under test, the influence of the left positive side wind or the wind direction with an angle on the aerodynamic stability of the fan is studied.

[0103] (2) Figure 7 As shown, by adjusting the position of the side wind generating device 100 to the right side of the tested aircraft engine 400, the influence of the right positive side wind or the wind direction with an angle on the aerodynamic stability of the fan is studied.

[0104] (3) Figure 8As shown, by adjusting the position of the side wind generating device 100 to the rear of the aircraft engine 400 under test, the influence of the tail wind on the engine starting process is studied.

[0105] The above schemes are only typical angles, and the angle of the side wind generator 110 can be rotated by the planetary gearbox 120 as needed to achieve scenarios under more side wind angles.

[0106] The test method for studying the influence of different sidewind directions on the aerodynamic stability of an engine utilizes the square slide rail aero-engine sidewind test bench of the present invention, fixes the square slide rail on the ground, changes the relative positions of a sidewind generating device and the engine, and realizes horizontal sliding of the sidewind generating device in a positive sidewind test, so as to meet the wind field requirements of engines of different sizes, thereby improving the stability of the test and the reliability of the test results.

[0107] Furthermore, since the square slide rail aero-engine sidewind test bench of the present invention has the characteristics of flexible, stable and adjustable wind field angle, higher applicability, high adjustment efficiency and simple structure, and has the ability to conduct sidewind tests and tailwind tests, the test process of the test method for studying the influence of different sidewind directions on the aerodynamic stability of the engine is simple and easy to operate.

[0108] The present invention also discloses a test method for an airframe simulation test device, which utilizes the square slide rail aero-engine crosswind test bench of the present invention and comprises the following steps:

[0109] Step S 1 ,like Fig.10 As shown, before the test, the airframe simulation device 500 is placed between the crosswind generating device 100 and the tested aircraft engine 400.

[0110] Step S 2 , turn on the side wind generator 110, and start the test aircraft engine 400 to slow speed.

[0111] Step S 3 , carry out steady-state and acceleration / deceleration tests from slow start to take-off conditions.

[0112] Step S 4 , the tested aircraft engine 400 returned to slow speed and stabilized.

[0113] Step S 5 , turn off the side wind generator 110.

[0114] Step S 6 , 400 aircraft engines under test stopped.

[0115] like Fig. 9A and Fig. 9BAs shown, the shape of the airframe simulation device 500 is cylindrical, generally made by rolling iron plates or the like, without end covers, and has a support structure below. Its diameter and length are greater than those of the tested aeroengine 400 itself.

[0116] For the test method of the airframe simulation test device of the present invention, since the square-rail aeroengine crosswind test bench of the present invention is utilized, by fixing the square rail on the ground and changing the relative positions of the crosswind generating device and the engine, the horizontal sliding of the crosswind generating device during the crosswind test is realized to meet the wind field requirements of engines of different sizes, and the stability of the test and the reliability of the test results can be improved.

[0117] Moreover, due to the characteristics of the square-rail aeroengine crosswind test bench of the present invention, such as flexible and stable adjustable crosswind field angle, higher applicability, high adjustment efficiency, and simple structure, and the ability to perform both crosswind tests and tailwind tests, the test process of the test method of the airframe simulation test device is simple and easy to operate.

[0118] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Without departing from the principles and essence of the present invention, those skilled in the art can make various changes or modifications to these embodiments, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A square slide rail aircraft engine side wind test bench, It is characterized in that The side wind test bench comprises a side wind generating device and a square ground fixed slide rail. The side wind generating device comprises a side wind generator, a planetary gear box, a base and a pulley. The side wind generating device can provide the test air flow required for the test; the planetary gear box is arranged at the bottom of the side wind generator so that the direction of the side wind generator can be freely changed; the base is connected under the planetary gear box; the pulley is arranged on the base so that the side wind generating device can move on the square ground fixed slide rail; The square ground fixed slide rail cooperates with the pulley to enable the side wind generating device to slide horizontally on one side of the tested engine.

2. The square slide rail aircraft engine crosswind test bench as claimed in claim 1, It is characterized in that The crosswind test bench also includes a ground effect simulation board, which is arranged at the bottom of the tested aircraft engine.

3. The square slide rail aircraft engine crosswind test bench as claimed in claim 1, It is characterized in that A driving motor is provided on the base of the side wind generating device and is connected to the power input shaft of the planetary gear box to provide power for the planetary gear box; the driving motor provides power to drive the side wind generating device to move on the square ground fixed slide rail.

4. The square slide rail aircraft engine crosswind test bench as claimed in claim 3, It is characterized in that The side wind generator includes a compression fan and a casing. The compression fan includes a plurality of compression fans arranged inside the casing and used for compressing airflow to provide the test air flow required for the test.

5. The square slide rail aircraft engine crosswind test bench as claimed in claim 4, It is characterized in that The casing comprises a compression straight section, a transition section and an air outlet which are connected in sequence, and the transition section adopts a convergent outlet form.

6. The square slide rail aircraft engine crosswind test bench as claimed in claim 5, It is characterized in that The compressed straight section and the air outlet are regular polygons or circles.

7. The square slide rail aircraft engine crosswind test bench as claimed in claim 3, It is characterized in that The planetary gearbox comprises a ring gear, a sun gear, planetary gears, a planet carrier and a power input shaft; The sun gear is connected to the power input shaft, and the driving motor provides power through the power input shaft; The planetary gear is disposed between the sun gear and the ring gear, and is meshed and connected with the sun gear and the ring gear, and is driven by the sun gear to drive the ring gear to rotate; The shaft of the planetary gear is fixedly mounted on the planetary carrier; The gear ring is fixedly connected to the bottom of the side wind generator.

8. The square slide rail aircraft engine crosswind test bench as claimed in claim 7, It is characterized in that The outer ring of the gear ring is provided with a flange edge, and the flange edge is provided with a threaded hole. The threaded hole cooperates with the bolt so that the gear ring is fixedly connected to the bottom of the side wind generator.

9. A test method for studying the influence of different crosswind directions on the aerodynamic stability of an engine, using the square slide rail aero engine crosswind test bench as claimed in any one of claims 1 to 8, wherein the test method is specifically as follows: By adjusting the position of the crosswind generator to the left side of the tested aircraft engine, the influence of the left positive crosswind or angled wind direction on the aerodynamic stability of the fan is studied. By adjusting the position of the crosswind generating device to the right side of the tested aircraft engine, the influence of the right positive crosswind or angled wind direction on the aerodynamic stability of the fan is studied. By adjusting the position of the side wind generating device behind the aircraft engine under test, the influence of tail wind on the engine starting process is studied.

10. A test method for an airframe simulation test device, using the square slide rail aircraft engine crosswind test bench as claimed in any one of claims 1 to 8, comprising the following steps: Step S 1 1. Before the test, place the airframe simulation device between the crosswind generating device and the aircraft engine under test; Step S 2 1. Turn on the crosswind generator and start the aircraft engine under test to slow speed; Step S 3 2. Carry out steady-state and acceleration / deceleration tests from slow start to take-off conditions; Step S 4 , the aircraft engine under test returns to slow speed stability; Step S 5 , turn off the side wind generator; Step S 6 , the test aircraft engine shuts down.

Images