Double-degree-of-freedom crosswind generating device, aero-engine test bed and test method

Abstract

The invention provides a two-degree-of-freedom crosswind generating device, an aero-engine test bed and a test method, and the device comprises a crosswind generator which is used for generating a wind field; the planetary gearbox is arranged at the bottom of the crosswind generator, is connected to the base through a power input shaft and is used for changing the orientation of the crosswind generator; the base is used for bearing and fixing the planetary gearbox and the crosswind generator; and the pulleys are arranged at the bottom of the base and used for driving the crosswind generating device to move on the ground fixed sliding rails. The double-degree-of-freedom crosswind generating device and the aero-engine test bed have the advantages of being flexible, stable and adjustable in wind field angle, high in adjusting efficiency and simple in structure. The test method saves the time for movement and recalibration work in the test.

Description

Technical Field

[0001] The present invention relates to the technical field of aero-engine testing, and in particular to a dual-degree-of-freedom sidewind generating device, an aero-engine testing platform and a testing method. Background Art

[0002] According to the requirements of Article 33.65 of the Civil Aviation Administration of China's "Aircraft Engine Airworthiness Regulations" (CCAR-33R2), when the engine is operating in the full envelope, steady state and transition state, the engine must have sufficient surge margin and must not cause surge or stall, resulting in flameout, structural failure, overtemperature and power or thrust that cannot be restored. In order to demonstrate compliance with this clause, engine manufacturers need to conduct a series of tests. Because takeoff and landing are the two most important operating conditions for aircraft, and the crosswind and tailwind at this time have the greatest impact on the surge margin of the engine start-up, acceleration and deceleration process, it is necessary to conduct crosswind tests and tailwind tests. The generation of crosswind and tailwind is inseparable from the crosswind generating device, and because the wind field area required for the crosswind and tailwind tests of aircraft engines is large and the flow rate is high, it is generally necessary to establish an outdoor test bench.

[0003] There are roughly two types of sidewind generating devices available in the world. One is the slide rail type, which can rotate around the engine along a circular slide rail to adjust the direction of the sidewind and conduct sidewind tests at different angles, or slide to the tail of the engine to conduct tailwind tests. The other is the track type, where the base of the sidewind generating device is equipped with tracks and can be moved freely on the test field to conduct sidewind or tailwind tests.

[0004] The slide rail type side wind generating device has the advantages of stable structure and easy calibration of wind field. However, each time the wind direction changes, the position of 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] The tracked sidewind generating device has the advantage of a large position adjustment range and can adapt to engine tests of different sizes. However, the tracked transmission structure is complex, large in size, heavy in weight, and the high degree of freedom makes it difficult to quickly and accurately calibrate the wind field before the test.

[0006] In view of this, the inventors of the present application have designed a dual-degree-of-freedom sidewind generating device, an aircraft engine test bench and a test method in order to overcome the above-mentioned 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 a sidewind generating device is difficult to move and calibrate when conducting a sidewind or tailwind test on an aircraft engine, and to provide a dual-degree-of-freedom sidewind generating device, an aircraft engine test bench and a test method.

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

[0009] The present invention provides a double-degree-of-freedom side wind generating device, which is characterized in that the side wind generating device comprises: a side wind generator, used to generate a wind field; a planetary gear box and a base, the planetary gear box is arranged at the bottom of the side wind generator and is connected to the base through a power input shaft to change the direction of the side wind generator; the base is used to support and fix the planetary gear box and the side wind generator; a pulley is arranged at the bottom of the base to drive the side wind generating device to move on a fixed slide rail on the ground.

[0010] According to one embodiment of the present invention, the side wind generating device further comprises a driving motor, which is disposed on the base and connected to a power input shaft of the planetary gearbox to provide power for the planetary gearbox.

[0011] 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.

[0012] 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.

[0013] According to one embodiment of the present invention, the compressed straight section and the air outlet are regular polygons or circles.

[0014] 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.

[0015] 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.

[0016] The present invention also provides an aircraft engine test bench, which is characterized in that the test bench comprises: the double-degree-of-freedom sidewind generating device, a ground fixed slide rail and a ground effect simulation board as described above, the pulley of the sidewind generating device is arranged on the ground fixed slide rail, and the sidewind generating device is driven to move on the ground fixed slide rail by providing power through a driving motor; the ground fixed slide rail is arranged in a circle around the aircraft engine being tested, so as to realize the functional switching of the sidewind test and the tailwind test; the ground effect simulation board is arranged at the bottom of the aircraft engine being tested.

[0017] The present invention also provides an aircraft engine tailwind test method, which is characterized in that the aircraft engine tailwind test method uses the aircraft engine test bench as described above, and the aircraft engine tailwind test method comprises the following steps: 1 , adjusting the position of the double-degree-of-freedom sidewind generating device to the tail of the aircraft engine being tested through the ground fixed slide rail; S 2 , driving the planetary gearbox by adjusting the driving motor to change the relative position of the sidewind generator and the aircraft engine under test, so that the axis of the aircraft engine under test is parallel to the axis of the sidewind generator; S 3 , installing the ground effect simulation board; S 4 , turn on the side wind generator; S 5 , start the aircraft engine under test to slow speed; S 6 , turn off the side wind generator; S 7 , the test aircraft engine is shut down.

[0018] The present invention also provides an aircraft engine crosswind test method, characterized in that the aircraft engine crosswind test method uses the aircraft engine test bench as claimed in claim 7, and the aircraft engine crosswind test method comprises the following steps: 1 , adjusting the position of the double-degree-of-freedom sidewind generating device to near the sidewind angle of the aircraft engine being tested through the ground fixed slide rail; S 2 , by adjusting the driving motor to drive the planetary gearbox to change the relative position of the sidewind generator and the aircraft engine under test, to obtain a precise sidewind angle; S 3 , installing the ground effect simulation board; S 4 , turn on the side wind generator; S 5 , start the aircraft engine under test to slow speed; S 6 , carry out steady-state propulsion test and record the performance parameters under target speed and crosswind; S 7 , the aircraft engine under test is pulled back to the idle speed; S 8 , turn off the side wind generator; S 9 , the test aircraft engine is shut down.

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

[0020] The dual-degree-of-freedom sidewind generating device, aeroengine test bench and test method of the present invention have at least the following advantages:

[0021] The dual-degree-of-freedom side wind generating device of the present invention can adjust the position and rotation angle of the side wind generator, so that the device has the ability to adjust the wind direction with dual degrees of freedom, thereby making the dual-degree-of-freedom side wind generating device of the present invention have the advantages of flexible and stable adjustable wind field angle, high adjustment efficiency and simple structure.

[0022] The aircraft engine test bench of the present invention adopts a combination of a motor-driven planetary gearbox and a circular ground-fixed slide rail. The motor drives the planetary gearbox so that the sidewind generating device can rotate 360 ​​degrees in situ, greatly shortening the time for adjusting the wind direction; the circular ground-fixed slide rail is used to change the relative position of the sidewind generating device and the aircraft engine, thereby realizing the change of the wind direction of the sidewind test and the function switching of the sidewind test and the tailwind test.

[0023] The aircraft engine tail wind test method and the aircraft engine side wind test method of the present invention simplify the steps of adjusting the position and direction of the side wind generating device during the test. And because the dual-degree-of-freedom side wind generating device and the aircraft engine test bench have the ability to adjust the wind direction with dual degrees of freedom, the time used for moving and recalibrating during the test can be saved, and rapid and accurate calibration can be achieved. During the test, the conditions of the wind field in various scenarios can be simulated more accurately, thereby improving the precision of the test and the accuracy of the experimental results. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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:

[0025] Figure 1 It is a schematic diagram of the aircraft engine test bench of the present invention.

[0026] Figure 2 It is a schematic diagram of the double-degree-of-freedom side wind generating device of the present invention.

[0027] Figure 3A It is a schematic diagram of a side wind generator in a dual-degree-of-freedom side wind generating device of the present invention.

[0028] Figure 3B yes Figure 3A AA cross-sectional view of .

[0029] Figure 3C yes Figure 3A BB cross-sectional view.

[0030] Figure 4 It is a schematic diagram of a planetary gearbox (excluding a planet carrier) in a dual-degree-of-freedom side wind generating device of the present invention.

[0031] Figure 5 It is a schematic diagram of a planetary gearbox (including a planetary carrier) in a dual-degree-of-freedom side wind generating device of the present invention.

[0032] [Reference Signs]

[0033] Double degree of freedom side wind generating device 100

[0034] Crosswind Generator 110

[0035] Compressor fan 111

[0036] Receiver 112

[0037] Compressed straight section 113

[0038] Transition section 114

[0039] Air outlet 115

[0040] Planetary gearbox 120

[0041] Power input shaft 121

[0042] Ring gear 122

[0043] Sun gear 123

[0044] Planetary gear 124

[0045] Planet carrier 125

[0046] Flange 126

[0047] Threaded hole 127

[0048] Base 130

[0049] Pulley 140

[0050] Drive motor 150

[0051] Ground fixed slide rail 200

[0052] Ground Effect Simulator 300

[0053] Tested aircraft engine 400 DETAILED DESCRIPTION

[0054] 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.

[0055] 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.

[0056] The purpose of this patent is to propose a dual-degree-of-freedom sidewind generating device with flexible and stable adjustable wind field angle, high adjustment efficiency and simple structure, an aircraft engine test bench with both sidewind and tailwind test capabilities, and a sidewind test method and a tailwind test method based on the aircraft engine test bench.

[0057] like Figure 2 As shown, the present invention provides a dual-degree-of-freedom side wind generating device 100, comprising a side wind generator 110, a planetary gear box 120, a base 130 and a pulley 140.

[0058] The side wind generator 110 is used to generate a wind field.

[0059] The planetary gearbox 120 and the base 130 , the planetary gearbox 120 is arranged at the bottom of the side wind generator 110 and is connected to the base 130 through the power input shaft 121 to change the direction of the side wind generator 110 ; the base 130 is used to support and fix the planetary gearbox 120 and the side wind generator 110 .

[0060] The pulley 140 is disposed at the bottom of the base 130 to drive the dual-degree-of-freedom side wind generating device 100 to move on the ground fixed slide rail 200 .

[0061] The dual-degree-of-freedom side wind generating device 100 of the present invention combines two methods: a planetary gear box 120 drives the side wind generator 110 to rotate and a pulley 140 drives the dual-degree-of-freedom side wind generating device 100 to move on a ground fixed slide rail 200. The position and rotation angle of the side wind generator 110 can be adjusted during the test, so that the test device has the ability to adjust the wind direction with dual degrees of freedom.

[0062] like Figure 2 As shown, as a preferred embodiment of the dual-degree-of-freedom side wind generating device 100 of the present invention, the dual-degree-of-freedom side wind generating device 100 also includes a drive motor 150, which is arranged on the base 130 and connected to the power input shaft 121 of the planetary gear box 120 for providing power to the planetary gear box 120.

[0063] As Figure 3A to Figure 3C shown, as a preferred embodiment of the two-degree-of-freedom crosswind generating device 100 of the present invention, the crosswind generator 110 includes a compression fan 111 and a casing 112. The compression fan 111 includes a plurality of groups of compression fans, which are arranged inside the casing 112 and used to compress air flow to provide the test air flow required for the test.

[0064] As Figure 3A to Figure 3C shown, as a preferred embodiment of the two-degree-of-freedom crosswind generating device 100 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. The transition section 114 adopts a convergent outlet form.

[0065] 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 compression straight section 113 is larger than the cross-sectional area at the connection between the transition section 114 and the air outlet 115, so as to be able to accelerate the air flow velocity.

[0066] As Figure 3B shown, it is a sectional view taken along line A-A of the compression straight section 113. Since the cross-sectional area at each part in the compression straight section 113 is equal, the cross-sectional area of the sectional view taken along line A-A is equivalent to the cross-sectional area at the connection between the above-mentioned transition section 114 and the compression straight section 113.

[0067] As Figure 3C shown, it is a sectional view taken along line B-B of the air outlet 115. The cross-sectional area of the sectional view taken along line B-B is equivalent to the cross-sectional area at the connection between the above-mentioned transition section 114 and the air outlet 115.

[0068] Combined with Figure 3A , Figure 3B and Figure 3C it can be known that for the two-degree-of-freedom crosswind generating device 100 of the present invention, it is designed such that the cross-sectional area at the connection between the transition section 114 and the compression straight section 113 is larger than the cross-sectional area at the connection between the transition section 114 and the air outlet 115.

[0069] As Figure 3A to Figure 3C shown, as a preferred embodiment of the two-degree-of-freedom crosswind generating device 100 of the present invention, the compression straight section 113 and the air outlet 115 are regular polygons or circles.

[0070] The above-mentioned regular polygon compression straight section 113 and regular polygon air outlet 115 can be preferably designed as regular hexagons.

[0071] The main purpose of the crosswind generator 110 is to generate a uniform wind field environment, requiring the air flow to be as uniform as possible and the flow velocity range to be wider. Ideally, the air flow at the circular air outlet 115 is the most uniform, but it is not conducive to processing and ground fixing.

[0072] 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.

[0073] like Figure 4 and Figure 5 As shown, as a preferred embodiment of the dual-degree-of-freedom side wind generating device 100 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 .

[0074] 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 .

[0075] The planetary gear 124 is disposed between the sun gear 123 and the ring gear 122 , and is meshed 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 smoothly.

[0076] The shaft of the planetary gear 124 is fixedly mounted on the planetary carrier 125 .

[0077] The gear ring 122 is fixedly connected to the bottom of the side wind generator 110 .

[0078] like Figure 4 and Figure 5 As shown, as a preferred embodiment of the dual-degree-of-freedom side wind generating device 100 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.

[0079] Since the dual-degree-of-freedom side wind generating device 100 of the present invention combines the planetary gear box 120 driven by a motor and the pulley moving on a fixed slide rail on the ground, the position and rotation angle of the side wind generator 110 can be adjusted, so that the device has the ability to adjust the wind direction with dual degrees of freedom. Therefore, the dual-degree-of-freedom side wind generating device 100 of the present invention has the advantages of flexible and stable adjustable wind field angle, high adjustment efficiency and simple structure.

[0080] like Figure 1 As shown, the present invention further provides an aircraft engine test bench, which includes: the dual-degree-of-freedom sidewind generating device 100 as described above, a ground fixed slide rail 200 and a ground effect simulation board 300.

[0081] The pulley 140 of the dual-degree-of-freedom side wind generating device 100 is disposed on a ground fixed slide rail 200 , and is driven by a driving motor 150 to provide power to drive the dual-degree-of-freedom side wind generating device 100 to move on the ground fixed slide rail 200 .

[0082] The ground fixed slide rail 200 is arranged in a circle around the aircraft engine 400 under test, so as to realize the functional switching between the sidewind test and the tailwind test.

[0083] The ground effect simulation board 300 is arranged at the bottom of the aircraft engine 400 under test.

[0084] The pulley 140 is installed on the base 130 of the side wind generating device and embedded in the ground fixed slide rail 200. The drive motor 150 provides power to drive the side wind generating device to move circumferentially throughout the test platform.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] The aircraft engine test bench of the present invention adopts a combination of a motor-driven planetary gearbox 120 and a circular 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 device has the ability to adjust the wind direction with two degrees of freedom. The motor drives the planetary gearbox 120, so that the sidewind generating device can rotate 360° in situ, greatly shortening the time for adjusting the wind direction; the circular ground-fixed slide rail 200 is used to change the relative position of the sidewind generating device and the aircraft engine, so as to achieve the change of the wind direction of the sidewind test and the function switching of the sidewind test and the tailwind test.

[0089] The crosswind generating device and the aircraft engine test bench of the present invention have the characteristics of flexible and stable adjustable wind field angle, high adjustment efficiency and simple structure, and can be mainly used in the field of aircraft engine testing, especially the field of crosswind testing of high bypass ratio turbofan engines. The aircraft engine test bench of the present invention has the ability to perform both crosswind testing and tailwind testing.

[0090] In summary, the aeroengine test bench of the present invention has the following advantages:

[0091] 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 rotate 360 ​​degrees in situ, so that there is no need to adjust the position of the side wind generating device base 130, 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.

[0092] Second, adopting a circular ground fixed slide rail 200. The crosswind generating device base 130 can be driven by a motor to move along the ground fixed circular slide rail, thereby changing the relative position of the crosswind generating device and the engine, and realizing the functional switching of the crosswind test and tailwind test at different angles.

[0093] The present invention also provides an aircraft engine tailwind test method, wherein the aircraft engine tailwind test method uses the aircraft engine test bench as described above, and comprises the following steps:

[0094] Step S 1 , adjust the position of the dual-degree-of-freedom sidewind generating device 100 to the tail of the tested aircraft engine 400 through the ground fixed slide rail 200.

[0095] Step S 2 , by adjusting the driving motor 150 to drive the planetary gear box 120 to change the relative position of the sidewind generator 110 and the tested aircraft engine 400, so that the axis of the tested aircraft engine 400 is parallel to the axis of the sidewind generator 110.

[0096] Step S 3 , install 300 ground effect simulation panels.

[0097] Step S 4 , turn on the side wind generator 110.

[0098] Step S 5 , start the test aircraft engine 400 to slow speed.

[0099] Step S 6 , turn off the side wind generator 110.

[0100] Step S 7 , 400 aircraft engines under test stopped.

[0101] The present invention also provides an aircraft engine crosswind test method, wherein the aircraft engine crosswind test method uses the aircraft engine test bench as described above, and comprises the following steps:

[0102] Step S 1, adjust the position of the dual-degree-of-freedom sidewind generating device 100 to near the sidewind angle of the tested aircraft engine 400 through the ground fixed slide rail 200.

[0103] Step S 2 , by adjusting the driving motor 150 to drive the planetary gearbox 120 to change the relative position of the sidewind generator 110 and the tested aircraft engine 400, a precise sidewind angle is obtained.

[0104] Step S 3 , install 300 ground effect simulation panels.

[0105] Step S 4 , turn on the side wind generator 110.

[0106] Step S 5 , start the test aircraft engine 400 to slow speed.

[0107] Step S 6 , carry out steady-state propulsion and rotation tests, and record the performance parameters under target speed and crosswind.

[0108] Step S 7 , the aircraft engine under test was pulled back to the slow speed of 400.

[0109] Step S 8 , turn off the side wind generator 110.

[0110] Step S 9 , 400 aircraft engines under test stopped.

[0111] The crosswind is the wind with a non-zero vertical component encountered by the aircraft during takeoff or landing.

[0112] The tail wind is the wind in the same direction as the aircraft's forward direction that the aircraft encounters during takeoff or landing.

[0113] When conducting a crosswind test, firstly, the circumferential position of the double-degree-of-freedom crosswind generating device 100 is adjusted along the circular ground fixed slide rail 200 by driving the pulley 140 to reach a suitable test position. When the wind direction needs to be changed, the following two solutions can be adopted:

[0114] Solution 1: The pulley 140 can be directly driven to move along the circular ground fixed slide rail 200 to change to a suitable wind direction.

[0115] Solution 2: By directly driving the planetary gearbox 120, the side wind generator 110 is rotated in situ to change to a suitable wind direction.

[0116] The above-mentioned aircraft engine tail wind test method and aircraft engine side wind test method utilize the characteristics of the improved double-degree-of-freedom side wind generating device 100 and the aircraft engine test bench of the present invention, which have the characteristics of flexible and stable adjustable wind field angle, high adjustment efficiency, and simple structure, and simplify the adjustment steps of the position and direction of the side wind generating device during the test. And because the double-degree-of-freedom side wind generating device 100 and the aircraft engine test bench have the ability to adjust the wind direction with double degrees of freedom, it can save the time used for moving and recalibrating work during the test, and achieve fast and accurate calibration. During the test, it can also more accurately simulate the conditions of the wind field in various scenarios, and improve the precision of the test and the accuracy of the experimental results.

[0117] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A dual-degree-of-freedom side wind generating device, It is characterized in that The side wind generating device comprises: A side wind generator for generating a wind field; A planetary gearbox and a base, wherein the planetary gearbox is arranged at the bottom of the side wind generator and is connected to the base through a power input shaft to change the orientation of the side wind generator; the base is used to carry and fix the planetary gearbox and the side wind generator; A pulley is arranged at the bottom of the base and is used to drive the side wind generating device to move on the ground fixed slide rail.

2. The double-degree-of-freedom side wind generating device according to claim 1, It is characterized in that The side wind generating device also includes a driving motor, which is arranged on the base and connected to the power input shaft of the planetary gearbox to provide power for the planetary gearbox.

3. The double-degree-of-freedom side wind generating device according to claim 1, 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.

4. The double-degree-of-freedom side wind generating device according to claim 3, 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.

5. The double-degree-of-freedom side wind generating device according to claim 4, It is characterized in that The compressed straight section and the air outlet are regular polygons or circles.

6. The double-degree-of-freedom side wind generating device according to claim 2, 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.

7. The double-degree-of-freedom side wind generating device according to claim 6, 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.

8. An aircraft engine test bench, It is characterized in that The test bench comprises: a dual-degree-of-freedom sidewind generating device as described in any one of claims 2 to 7, a ground fixed slide rail and a ground effect simulation board, The pulley of the side wind generating device is arranged on the ground fixed slide rail, and the side wind generating device is driven to move on the ground fixed slide rail by providing power through a driving motor; The ground fixed slide rail is arranged in a circle around the aircraft engine under test, and can realize the function switching of the sidewind test and the tailwind test; The ground effect simulation board is arranged at the bottom of the tested aircraft engine.

9. A method for testing tail wind of an aircraft engine. It is characterized in that The aircraft engine tailwind test method uses the aircraft engine test bench as claimed in claim 8, and the aircraft engine tailwind test method comprises the following steps: S 1 , adjusting the position of the double-degree-of-freedom sidewind generating device to the tail of the aircraft engine being tested through the ground fixed slide rail; S 2 , driving the planetary gearbox by adjusting the driving motor to change the relative position of the sidewind generator and the aircraft engine under test, so that the axis of the aircraft engine under test is parallel to the axis of the sidewind generator; S 3 , installing the ground effect simulation board; S 4 , turning on the side wind generator; S 5 , starting the aircraft engine under test to idle speed; S 6 , turning off the side wind generator; S 7 , the test aircraft engine is shut down.

10. A method for testing aeroengine crosswinds. It is characterized in that The aircraft engine crosswind test method uses the aircraft engine test bench as claimed in claim 7, and the aircraft engine crosswind test method comprises the following steps: S 1 , adjusting the position of the double-degree-of-freedom sidewind generating device to near the sidewind angle of the aircraft engine being tested through the ground fixed slide rail; S 2 , by adjusting the driving motor to drive the planetary gearbox to change the relative position of the sidewind generator and the aircraft engine under test, to obtain a precise sidewind angle; S 3 , installing the ground effect simulation board; S 4 , turning on the side wind generator; S 5 , starting the aircraft engine under test to idle speed; S 6 2. Carry out steady-state propulsion and rotation tests to record performance parameters at target speed and crosswind; S 7 , the aircraft engine under test is pulled back to an idle speed; S 8 , turning off the side wind generator; S 9 The test aeroengine stops running.

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