Gust simulation device

Abstract

The gust simulation device comprises a driving shaft, a blade grid, a wedge block and a step sleeve, and the driving shaft is provided with a round hole, a straight square hole and an inverted cone square hole which are sequentially distributed in the axial direction; a blade handle of the blade grid comprises a round boss, a square boss, a first inverted-cone square boss, a second inverted-cone square boss and a wing-shaped boss which are sequentially connected into a whole from left to right, the round boss is inserted into the round hole, so that the square boss is located in the straight square hole, and the first inverted-cone square boss corresponds to the inverted-cone square hole in position; the wedge block is inserted between the first inverted cone square boss and the inverted cone square hole; the extending end face of the driving shaft and the first inverted-cone-shaped boss are sleeved with the step sleeve. The step sleeve is connected with the flange plate of the driving shaft through a bolt, so that the step sleeve abuts against the step of the wedge block. Torque is transmitted between the driving shaft and the blade grid through the rectangular section and is wedged through the wedge blocks, self-locking angles are formed in all contact faces, the driving shaft and the blade grid are reliably connected, and it is guaranteed that loads and bending moment are stably transmitted.

Description

Technical Field

[0001] The invention relates to the technical field of wind tunnel testing, and more particularly to a gust simulation device. Background Art

[0002] The gust simulation device is an important equipment for wind tunnel tests to study the dynamic characteristics of aircraft in gust environments (unsteady loads, flight stability, structural strength and flight control). It makes high-frequency reciprocating swings in the flow field to make the flow field unstable, simulating a high-altitude gust environment.

[0003] However, most of the existing gust simulation devices are designed for low-speed wind tunnel tests. Due to the high blockage requirements and high operating speed and pressure of high-speed wind tunnels, the high-speed aerodynamic load of gust simulation devices of the same size is often several times the aerodynamic load of low-speed wind tunnels. Therefore, the design scheme of the gust generating device of the low-speed wind tunnel cannot be directly applied to the high-speed wind tunnel. The development of high-speed gust simulation devices is very difficult. In particular, in order to realize the blade swing of the gust simulation device, a motor needs to be connected to a drive device, and the drive device needs to be connected to the blade. The connection between the drive device and the blade is unreliable, resulting in unstable load transmission. At the same time, the blade will be subjected to alternating aerodynamic loads and inertial loads in the high-speed flow field. The operating conditions are complex and the load is large, which cannot meet the requirements for the use of aerodynamic loads and inertial loads.

[0004] Therefore, providing a stable and reliable gust simulation device is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] In view of this, the present invention provides a gust simulation device, which can ensure the stability and reliability of the blade cascade when it swings at a high frequency.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A gust simulation device, comprising:

[0008] A driving shaft, one end of which is provided with a flange; the driving shaft is provided with a circular hole, a straight square hole and an inverted tapered square hole which are distributed in sequence along the axial direction;

[0009] A blade cascade, wherein the blade stalk of the blade cascade comprises a circular boss, a square boss, a first inverted cone square boss, a second inverted cone square boss and a wing-shaped boss which are connected as one from left to right in sequence, wherein the circular boss is inserted into the circular hole so that the square boss is located in the straight square hole, and the first inverted cone square boss corresponds to the position of the inverted cone square hole;

[0010] A wedge block, the wedge block is inserted between the first inverted tapered square boss and the inverted tapered square hole;

[0011] A step sleeve is sleeved on the extended end surface of the drive shaft and the first inverted cone boss; the step sleeve is connected to the flange by bolts so that the step sleeve abuts against the step of the wedge block.

[0012] By adopting the above technical solution, the beneficial effects of the present invention are:

[0013] The drive shaft and the blades are connected by a rectangular cross section to transmit torque and are wedged tight by wedges. Each contact surface forms a self-locking angle to avoid loosening due to force. The drive shaft and the blades are reliably connected to ensure stable load and moment transmission.

[0014] Furthermore, the cross section of the petiole is an I-shape with a hole.

[0015] The beneficial effect of adopting the above further technical solution is to reduce the rotational inertia of the petiole.

[0016] Furthermore, the blade grid also includes a supporting frame, a lightweight material and a skin, wherein the supporting frame is fitted and fixed on the petiole; the lightweight material is filled in the supporting frame; and the skin is wrapped around the supporting frame and the lightweight material.

[0017] The beneficial effect of adopting the above further technical solution is that the lightweight material filling can reduce the skin thickness, reduce the blade weight, and thus reduce the inertial load.

[0018] Furthermore, the supporting skeleton includes a main supporting frame, an auxiliary supporting frame and a wrapping cloth, and the main supporting frame and the auxiliary supporting frame are connected as a whole by wrapping the wrapping cloth; the main supporting frame has a mounting hole with the same shape as the petiole, so that the petiole can be inserted and fixed in the mounting hole.

[0019] The beneficial effect of adopting the above-mentioned further technical solution is that each component has independence, and the ply design can be performed separately according to the load, so as to effectively bring into play the material characteristics.

[0020] Furthermore, the auxiliary support frame is U-shaped, and the middle part of the auxiliary support frame is fitted together with the main support frame; the extended end of the auxiliary support frame is provided with a flange structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0022] Figure 1The accompanying drawing is a schematic diagram of the overall structure of a gust simulation device provided by the present invention;

[0023] Figure 2 The accompanying drawing is a top view of a gust simulation device provided by the present invention;

[0024] Figure 3 The accompanying drawing is a cross-sectional view of a gust simulation device provided by the present invention;

[0025] Figure 4 The attached picture is Figure 3 A schematic diagram of the enlarged structure of part A;

[0026] Figure 5 The accompanying drawing is an axial side view of the drive shaft provided by the present invention;

[0027] Figure 6 The accompanying drawing is an axial side view of the petiole provided by the present invention;

[0028] Figure 7 The accompanying drawing is a front view of the petiole provided by the present invention;

[0029] Figure 8 The accompanying drawing is a cross-sectional view of a petiole provided by the present invention;

[0030] Fig. 9 The accompanying drawing is an axial side view of the wedge block provided by the present invention;

[0031] Fig.10 The accompanying drawing is an axial view of the step sleeve provided by the present invention;

[0032] Fig.11 The accompanying drawing is a cross-sectional view of the step sleeve provided by the present invention;

[0033] Fig.12 The accompanying drawing is a schematic diagram of the structure of the cascade provided by the present invention;

[0034] Fig.13 The accompanying drawing is an axial side view of the auxiliary support frame provided by the present invention;

[0035] Fig.14 The accompanying drawing is an axial side view of the main support frame provided by the present invention. DETAILED DESCRIPTION

[0036] 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.

[0037] like Figure 1-14As shown, the embodiment of the present invention discloses a gust simulation device, including a driving shaft 1, a blade cascade 2, a wedge 3 and a step sleeve 4, a flange 5 is arranged at one end of the driving shaft 1; the driving shaft 1 is provided with a circular hole 11, a rectangular hole 12 and an inverted cone square hole 13 distributed in sequence along the axial direction; the blade stalk 21 of the blade cascade 2 includes a circular boss 211, a square boss 212, a first inverted cone square boss 213, a second inverted cone square boss 214 and a wing-shaped boss 215 connected as one from left to right, the circular boss 211 is inserted into the circular hole 11, so that the square boss 212 is located in the rectangular hole 12, the first inverted cone square boss 213 and the inverted cone square boss 214 are connected as one from left to right, and the circular boss 211 is inserted into the circular hole 11, so that the square boss 212 is located in the rectangular hole 12, and the first inverted cone square boss 213 and the inverted cone square boss 214 are connected as one from left to right. The position of the square hole 13 corresponds to the position of the petiole 21; the upper and lower surfaces of the wedge block 3 are both inclined surfaces, and the wedge block 3 is inserted between the first inverted cone square boss 213 and the inverted cone square hole 13; the step sleeve 4 is fitted on the extended end surface of the drive shaft 1 and the first inverted cone square boss 213; the step sleeve 4 is connected to the flange 5 by bolts 6, so that the step sleeve 4 abuts against the step 31 of the wedge block 3, that is, by tightening the bolts 6, the step sleeve 4 can be moved, and the step sleeve 4 drives the wedge block 3 to move, so that the two inclined surfaces of the wedge block 3 are respectively tightly fitted with the inner surface of the inverted cone square hole 13 of the drive shaft 1 and the outer surface of the first inverted cone square boss 213. The present invention adopts a rectangular cross-section to transmit torque between the drive shaft 1 and the blade cascade 2, and is wedged by the wedge block 3. Each contact surface forms a self-locking angle, which can avoid loosening due to force. The drive shaft 1 and the blade cascade 2 are reliably connected to ensure stable load and bending moment transmission.

[0038] In order to further optimize the technical solution of the present invention, the cross section of the petiole 21 is an I-shape with a hole, which can reduce the rotational inertia of the petiole 21.

[0039] Specifically, the blade cascade 2 also includes a supporting frame 22, a lightweight material 23 and a skin 24. The supporting frame 22 is fitted and fixed on the petiole 21; the lightweight material 23 is filled in the supporting frame 22; the skin 24 is wrapped around the supporting frame 22 and the lightweight material 23. The filling of the lightweight material 23 can reduce the thickness of the skin 24, reduce the weight of the blade cascade 2, and thus reduce the inertial load.

[0040] Specifically, the support skeleton 22 includes a main support frame 221, an auxiliary support frame 222 and a wrapping cloth 223. The main support frame 221 and the auxiliary support frame 222 are connected as a whole by wrapping the wrapping cloth 223. Each component is independent and can be individually designed for layering according to the load to effectively exert the material properties. The main support frame 221 has a mounting hole with the same shape as the petiole 21, so that the petiole 21 can be inserted and fixed in the mounting hole, which can prevent the main support frame 221 from being detached from the petiole 21, and the fit is tighter when under stress.

[0041] Specifically, the auxiliary support frame 222 is U-shaped, and the middle portion of the auxiliary support frame 222 is in close contact with the main support frame 221 ; the extended end portion of the auxiliary support frame 222 is provided with a flange structure.

[0042] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0043] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gust simulation device, characterized in that: include: A driving shaft, one end of which is provided with a flange; the driving shaft is provided with a circular hole, a straight square hole and an inverted tapered square hole which are distributed in sequence along the axial direction; A blade cascade, wherein the blade stalk of the blade cascade comprises a circular boss, a square boss, a first inverted cone square boss, a second inverted cone square boss and a wing-shaped boss which are connected as one from left to right in sequence, wherein the circular boss is inserted into the circular hole so that the square boss is located in the straight square hole, and the first inverted cone square boss corresponds to the position of the inverted cone square hole; A wedge block, the wedge block is inserted between the first inverted tapered square boss and the inverted tapered square hole; A step sleeve is sleeved on the extended end surface of the drive shaft and the first inverted cone boss; the step sleeve is connected to the flange by bolts so that the step sleeve abuts against the step of the wedge block.

2. A gust simulation device according to claim 1, characterized in that: The cross section of the petiole is in an I-shape with a hole.

3. A gust simulation device according to claim 1 or 2, characterized in that: The blade grid also includes a supporting frame, a lightweight material and a skin. The supporting frame is sleeved and fixed on the petiole; the lightweight material is filled in the supporting frame; and the skin is wrapped around the supporting frame and the lightweight material.

4. A gust simulation device according to claim 3, characterized in that: The support frame includes a main support frame, an auxiliary support frame and a wrapping cloth, and the main support frame and the auxiliary support frame are connected as a whole by wrapping the wrapping cloth; the main support frame has a mounting hole with the same shape as the petiole, so that the petiole can be inserted and fixed in the mounting hole.

5. A gust simulation device according to claim 4, characterized in that: The auxiliary support frame is U-shaped, and the middle part of the auxiliary support frame is fitted together with the main support frame; the extended end of the auxiliary support frame is provided with a flange structure.

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