A large-scale low-speed wind tunnel buffeting test wing model support device

Abstract

The invention discloses a large-scale low-speed wind tunnel buffeting test wing model supporting device, comprising a base, a slewing support mechanism, a model adapter, a wing model, a fairing fuselage and an automatic centering mechanism, wherein the base is fixedly connected to the H-shaped steel of the test section side wall, and the base is fixedly connected to the slewing support mechanism; the model adapter extends into the wind tunnel through the wind tunnel side wall observation window, the outer end of the model adapter is fixedly connected to the slewing support mechanism, the upper and lower ends of the model adapter are respectively fixedly connected to the fairing fuselage and the wing model, the fairing fuselage and the wing model are non-contacting, the automatic centering mechanism is fixedly connected to the base, the automatic centering mechanism drives the slewing support mechanism to rotate and adjust, and as the slewing support mechanism rotates, the model adapter drives the fairing fuselage and the wing model to rotate together. The components of the device are installed outside the wind tunnel, which reduces the blockage and has no interference with the wind tunnel flow field.

Description

Technical Field

[0001] The invention relates to a large-scale low-speed wind tunnel buffeting test wing model supporting device. Background Art

[0002] If the airflow separates when the aircraft is flying at a low speed and a high angle of attack, it will induce flutter. Flutter is the forced vibration of the aircraft structure caused by the random pulsating pressure excitation in the separated airflow. Although the aircraft flutter does not cause immediate structural damage like flutter, it increases the structural stress and reduces the fatigue life of the structure; it reduces the performance of the aircraft (increased drag and reduced lift); the aircraft will pitch up, the wings will fall, the head will tilt, and the swaying will occur, resulting in the deterioration of the flight quality of the aircraft. In addition to reducing the work efficiency of the crew and making passengers feel uncomfortable, it will also cause the working environment of the onboard equipment to deteriorate and fail to work normally. At present, wind tunnel tests are usually used to study the flutter characteristics of aircraft. It is necessary to design and process a special support device for the flutter test. In order to simulate the actual situation of the wind tunnel test model as much as possible, the model should be made as large as possible, or components such as wings should be used for model flutter test research. This requires that the flutter test model support device can simulate the working conditions of large angles of attack to meet the test conditions for the occurrence of model flutter. In addition, most of the existing flutter test wing model support devices install part of the structure in the wind tunnel, which increases the blockage and affects the wind tunnel flow field; the traditional manual adjustment of the model angle of attack results in low test efficiency and poor accuracy. Summary of the invention

[0003] In order to solve the above problems, the purpose of the present invention is to provide a large-scale low-speed wind tunnel buffeting test wing model support device, the device itself is installed outside the wind tunnel, reducing the blockage and having no interference with the wind tunnel flow field.

[0004] The present invention is mainly realized through the following technical scheme: a large-scale low-speed wind tunnel buffeting test wing model support device, comprising a base, a slewing support mechanism, a model adapter, a wing model, a fairing fuselage and an automatic centering mechanism, wherein the base is fixedly connected to the H-shaped steel of the test section side wall, and the base is fixedly connected to the slewing support mechanism; the model adapter extends into the wind tunnel through an observation window on the wind tunnel side wall, the outer end of the model adapter is fixedly connected to the slewing support mechanism, the upper and lower ends of the model adapter are respectively fixedly connected to the fairing fuselage and the wing model, the fairing fuselage and the wing model are non-contacting, the automatic centering mechanism is fixedly connected to the base, the automatic centering mechanism drives the slewing support mechanism to rotate and adjust, and as the slewing support mechanism rotates, the model adapter drives the fairing fuselage and the wing model to rotate together.

[0005] The present invention also has the following technical features: the slewing support mechanism includes a slewing support transfer plate, a slewing support outer ring and a slewing support inner ring, the outer side of the slewing support transfer plate is fixedly connected to the model adapter, the inner side of the slewing support transfer plate is fixedly connected to the slewing support outer ring, the slewing support outer ring is sleeved on the slewing support inner ring and is rotatably connected to it, and the slewing support inner ring is fixedly connected to the base.

[0006] The advantages and beneficial effects of the present invention are as follows: the present invention can achieve a model angle of attack variation range of -10° to 40°, and can fully realize the working condition of large angle of attack aerodynamic separation inducing model flutter; the angle of attack of the wing model is adjusted by motor drive, and the angular velocity can reach 2 to 3° / s, and the angle of attack of the wing model can be continuously changed, thereby improving the test efficiency; the wing model and the fairing can move synchronously, and the two are not connected, thereby avoiding the transmission of the vibration of the tunnel wall to the wing model during the test, thereby affecting the data collection; the device can support a wing model with a span of 6 meters, and can operate under a wind load of 100m / s; the components of the device itself are all installed outside the wind tunnel, thereby reducing the blockage and having no interference with the wind tunnel flow field; the device can be used for both flutter tests and flutter tests, and has the advantages of strong applicability, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is an overall front view of the present invention.

[0008] Figure 2 It is an overall side view of the present invention.

[0009] Figure 3 This is the structural diagram of the slewing bearing mechanism.

[0010] Figure 4 This is the structural diagram of the automatic centering device.

[0011] Among them, 1. H-shaped steel, 2. base, 3. fairing fuselage, 4. wind tunnel observation window, 5. wind tunnel lower wall plate, 6. wind tunnel upper wall plate, 21. slewing bearing mechanism, 22. model adapter, 23. wing model, 24. fairing fuselage, 33. slewing bearing adapter plate, 35. slewing bearing frame, 36. automatic centering device, 41. slewing bearing inner ring, 42. slewing bearing outer ring, 43. transmission shaft, 44. angular contact bearing, 45. pinion, 46. transmission shaft fixing frame, 47. disc spring sliding rod, 48. clamping adjustment nut, 49. sliding rod support seat, 50. disc spring, 51. guide rail fixing seat, 52. slider, 53. guide rail, 54. motor, 55. reducer. DETAILED DESCRIPTION

[0012] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings:

[0013] Example 1

[0014] like Figure 1-2 As shown, a large-scale low-speed wind tunnel buffeting test wing model support device includes a base, a slewing support mechanism, a model adapter, a wing model, a fairing fuselage and an automatic centering mechanism. The base is fixedly connected to the H-shaped steel of the test section side wall, and the base is fixedly connected to the slewing support mechanism; the model adapter extends into the wind tunnel through the wind tunnel side wall observation window, the outer end of the model adapter is fixedly connected to the slewing support mechanism, the upper and lower ends of the model adapter are respectively fixedly connected to the fairing fuselage and the wing model, and the fairing fuselage and the wing model are non-contacting, the automatic centering mechanism is fixedly connected to the base, and the automatic centering mechanism drives the slewing support mechanism to rotate and adjust, and as the slewing support mechanism rotates, the model adapter drives the fairing fuselage and the wing model to rotate together. When the specified test angle of attack is reached, the support beams inside the front and rear ends of the fairing fuselage are connected to the wind tunnel side wall, and the test state is reached.

[0015] like Figure 3 As shown, the slewing support mechanism includes a slewing support adapter plate, a slewing support outer ring, and a slewing support inner ring. The outer side of the slewing support adapter plate is connected to the model adapter by straight-mouth positioning bolts, the inner side of the slewing support adapter plate is connected to the slewing support outer ring by straight-mouth positioning bolts, and the slewing support inner ring is also connected to the base by straight-mouth positioning bolts. The slewing support outer ring is sleeved on the slewing support inner ring and is rotatably connected thereto. The slewing support outer ring teeth are connected to the power output gear of the automatic self-aligning device through gears to achieve backlash-free meshing.

[0016] like Figure 4 As shown, the automatic self-aligning device uses a motor as power, the reducer and the motor are connected by an expansion sleeve, the two ends of the reducer transmission shaft are supported on the fixed frame by two angular contact ball bearings, and the middle is fixedly connected to the power output gear by a flat key. One end of the reducer transmission shaft is sealed with a flange cover, and the other end is connected to the reducer by a flat key to transmit motion and driving force; the bottom of the reducer transmission shaft fixing frame is connected to the guide rail fixing seat through a slider and a guide rail, and they can move linearly with each other. The side of the transmission shaft fixing frame is connected to the guide rail fixing seat through a disc spring, and the distance and clamping force between the pinion and the outer ring of the slewing bearing are adjusted by tightening the adjusting nut, and the guide rail fixing seat is connected to the base.

Claims

1. A large-scale low-speed wind tunnel buffeting test wing model support device, comprising a base, a rotary support mechanism, a model adapter, a wing model, a rectifier fuselage and an automatic centering mechanism, characterized in that: The base is fixedly connected to the H-shaped steel of the side wall of the test section, and the base is fixedly connected to the slewing support mechanism; the model adapter extends into the wind tunnel through the observation window of the wind tunnel side wall, the outer end of the model adapter is fixedly connected to the slewing support mechanism, the upper and lower ends of the model adapter are respectively fixedly connected to the fairing fuselage and the wing model, the fairing fuselage and the wing model are non-contacting, the automatic centering mechanism is fixedly connected to the base, the automatic centering mechanism drives the slewing support mechanism to rotate and adjust, and as the slewing support mechanism rotates, the model adapter drives the fairing fuselage and the wing model to rotate together; the slewing support mechanism includes a slewing support adapter plate, a slewing support outer ring and a slewing support inner ring, the outer side of the slewing support adapter plate is fixedly connected to the model adapter, the inner side of the slewing support adapter plate is fixedly connected to the slewing support outer ring, the slewing support outer ring is sleeved on the slewing support inner ring and is rotatably connected to it, and the slewing support inner ring is fixedly connected to the base.

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