Adjustable rectangular contraction flow channel structure

Abstract

The present invention relates to the technical field of wind tunnel flow channel design, and discloses an adjustable rectangular contraction flow channel structure, comprising a contraction flow channel formed by a front side wall and a rear side wall that are parallel to each other, and a contraction wall arranged perpendicular to the front side wall and the rear side wall. The contraction profile of the contraction wall adopts a bicubic curve design, and the contraction wall is divided at the inflection point of the bicubic curve to form a fixed contraction wall and a movable contraction wall. The movable contraction wall has a flat surface coplanar with the cross section of the inflection point of the bicubic curve. The fixed contraction wall is fixed to the rear side wall, and an adjustment mechanism is provided on the outside of the movable contraction wall to control the movable contraction wall to slide along the tangent direction of the inflection point of the bicubic curve. The contraction profile is divided into two sections, and the division point of the fixed contraction wall and the movable contraction wall is at the inflection point of the bicubic curve. By cleverly pulling or pushing the adjustment mechanism, the movable contraction wall slides along the flat surface relative to the fixed contraction wall, thereby facilitating and freely adjusting the height of the rectangular contraction flow channel and effectively ensuring the flow field quality of the flow channel outlet.

Description

Technical Field

[0001] The present invention relates to the technical field of wind tunnel flow channel design, and in particular to an adjustable rectangular contraction flow channel structure. Background Art

[0002] The height adjustment structure of the rectangular contraction flow channel in a wind tunnel is divided into a soft-wall adjustment structure and a solid-wall adjustment structure. The soft-wall adjustment structure has a complex structure, is difficult to manufacture and process, and has poor economic efficiency. The traditional solid-wall adjustment structure has an uneven flow channel wall and poor flow field quality at the flow channel outlet. Summary of the Invention

[0003] The technical problem solved by the present invention is to overcome the defects of the prior art and provide an adjustable rectangular contraction flow channel structure which is simple in structure, practical and economical, and can effectively ensure the quality of the flow field.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] An adjustable rectangular contraction flow channel structure includes a contraction flow channel formed by a front side wall and a rear side wall that are parallel to each other, and a contraction wall arranged perpendicular to the front side wall and the rear side wall. The contraction profile of the contraction wall adopts a bicubic curve design. The contraction wall is divided at the inflection point of the bicubic curve to form a fixed contraction wall and a movable contraction wall. The movable contraction wall has a flat surface that is coplanar with the tangent surface of the inflection point of the bicubic curve. The fixed contraction wall is fixed to the rear side wall. An adjustment mechanism is provided on the outside of the movable contraction wall to control the sliding of the movable contraction wall along the tangent direction of the inflection point of the bicubic curve.

[0006] Furthermore, a boss is provided on the outside of the movable contraction wall, and the adjustment mechanism includes a slider provided on the boss, a guide rail provided parallel to the tangent direction of the inflection point of the bicubic curve, a telescopic cylinder connected to the boss and providing sliding force for the movable contraction wall, the telescopic rod of the telescopic cylinder is hinged to the boss, and the slider and the guide rail are provided in combination.

[0007] Furthermore, it also includes a cover plate that is fitted with the outer side of the fixed contraction wall, and a support frame is provided on the cover plate for installing and fixing the telescopic cylinder.

[0008] Furthermore, the number of guide rails is 2.

[0009] Furthermore, the telescopic cylinder is any one of an electric cylinder, a hydraulic cylinder and a pneumatic cylinder.

[0010] Furthermore, a boss is provided on the outer side of the movable contraction wall, a threaded hole is provided on the boss, and the adjustment mechanism includes a fixed screw that can be screwed with the threaded hole, and the fixed screw is arranged parallel to the tangent direction of the inflection point of the bicubic curve.

[0011] Furthermore, sealing strips are arranged at the contact positions of the movable contraction wall with the front side wall and the rear side wall.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This application creatively divides the contraction profile into two sections, and the division point between the fixed contraction wall and the movable contraction wall is exactly at the inflection point of the bicubic curve. Through the clever pulling or pushing of the adjustment mechanism, the movable contraction wall slides along the flat surface relative to the fixed contraction wall, which facilitates the free adjustment of the height of the rectangular contraction flow channel and effectively ensures the flow field quality of the flow channel outlet.

[0014] The overall structure of the contraction flow channel structure of the present application is simple. Through the cooperation of the track, the slider and the telescopic cylinder, the adjustment operation of the flow channel height is simple and quick, and the whole process can be automatically adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of the adjustable rectangular contraction flow channel structure described in Example 1;

[0016] Figure 2 for Figure 1 Middle AA cross-section;

[0017] Figure 3 This is the aerodynamic profile diagram of the contraction surface described in Example 1. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic diagrams rather than actual drawings, and should not be understood as limiting this patent. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings.

[0019] Example 1

[0020] like Figure 1 and Figure 2 As shown, an adjustable rectangular contraction flow channel structure includes a contraction flow channel formed by a front side wall 1 and a rear side wall 2 parallel to each other, and a contraction wall arranged perpendicular to the front side wall and the rear side wall. The contraction profile of the contraction wall adopts a bicubic curve design. The contraction wall is divided at the inflection point of the bicubic curve to form a fixed contraction wall 3 and a movable contraction wall 4. The movable contraction wall 4 has a flat surface 42 that is coplanar with the cross-section of the inflection point of the bicubic curve. The fixed contraction wall 3 is fixed to the rear side wall 2. An adjustment mechanism is provided on the outside of the movable contraction wall 4 to control the sliding of the movable contraction wall along the tangent direction of the inflection point of the bicubic curve.

[0021] Bicubic curves such as Figure 3As shown in the ABC curve segment, point B is the inflection point of the bicubic curve, segment CD is a straight line, and the contraction surface is the surface formed by the horizontal extension of curve ABCD. Figure 3 Point Bˊ is the position point reached after point B moves down along the tangent line of the inflection point. BBˊ is tangent to curves AB and BˊC respectively. When curve BCD moves along the straight line direction of BBˊ, the height h will change, which is consistent with Figure 1 The flow channel height of the middle flow channel structure is adjustable accordingly. Figure 1 The fixed contraction wall in Figure 3 The curve AB in Figure 1 The moving contraction wall in Figure 3 Curve BBˊCD in .

[0022] Specifically, a boss 41 is provided on the outside of the movable contraction wall 4, and the adjustment mechanism includes a slider 51 provided on the boss, a guide rail 52 provided parallel to the tangent direction of the inflection point of the bicubic curve, and a telescopic cylinder 53 connected to the boss 41 and providing sliding force for the movable contraction wall. The telescopic rod 531 of the telescopic cylinder is hinged to the boss 41 through a pin shaft, and the slider 51 is matched with the guide rail 52. The guide rail 52 is fixed to the rear side wall 2 by screws. The guide rail can ensure the instantaneous position determination and accurate moving direction of the movable contraction wall. Of course, the orientation of the telescopic cylinder 53 needs to be parallel to the guide rail 52 to ensure that its telescopic rod 531 smoothly drives the boss 41 to slide along the direction set by the guide rail, so that the movable contraction wall 4 is driven to slide along the fixed contraction wall 3, so that the height of the flow channel outlet changes.

[0023] In order to form a complete structure of the adjustable rectangular contraction flow channel, a cover plate 6 can be placed on the outside of the fixed contraction wall, the fixed contraction wall 3 is fixed to the cover plate 6, and a support frame 61 is provided on the cover plate for mounting the fixed telescopic cylinder 53. The cover plate, the front side wall, and the rear side wall form a rectangular space.

[0024] There are two sliders 51 set on each movable retracting wall boss, and two guide rails 52 cooperating with the sliders. The sliders are distributed at both ends of the boss, and the hinge point between the telescopic rod of the telescopic cylinder and the boss is located between the two sliders, which maximizes the guarantee of smooth movement of the movable retracting wall along the set direction.

[0025] The telescopic cylinder is any one of an electric cylinder, a hydraulic cylinder and a pneumatic cylinder.

[0026] In order to ensure the sealing between the movable retractable wall and the front side wall and the rear side wall when sliding, sealing strips 7 can be arranged at the contact positions of the movable retractable wall 4 and the front side wall 1 and the rear side wall 2 respectively. Specifically, sealing grooves are opened on both sides of the movable retractable wall, and the sealing strips are placed in the sealing grooves. When the movable retractable wall is installed and matched with the front side wall and the rear side wall, the sealing strips are pressed tightly to effectively achieve an airtight effect at the contact position.

[0027] The flow channel structure of this embodiment has a smooth contraction surface, the flow channel height can be automatically and freely adjusted, and the flow field quality of the flow channel outlet is good.

[0028] Example 2

[0029] The difference between this embodiment and embodiment 1 is that the position of the movable contraction wall is manually adjusted by a screw. Specifically, a boss is provided on the outer side of the movable contraction wall, and a threaded hole is provided on the boss. The adjustment mechanism includes a fixed screw that can be screwed with the threaded hole. The position of the fixed screw is fixed. When the fixed screw is rotated, the boss will be forced to slide, and finally the sliding of the movable contraction wall is realized. The fixed screw is set parallel to the tangent direction of the inflection point of the bicubic curve. Naturally, the direction of the threaded hole is consistent with the setting direction of the fixed screw.

[0030] Obviously, the above embodiments are merely examples for the purpose of clearly illustrating the technical solutions of the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. An adjustable rectangular contraction flow channel structure, characterized in that: The invention comprises a contraction flow channel formed by a front side wall and a rear side wall parallel to each other and a contraction wall arranged perpendicular to the front side wall and the rear side wall. The contraction profile of the contraction wall adopts a bicubic curve design. The contraction wall is divided at the inflection point of the bicubic curve to form a fixed contraction wall and a movable contraction wall. The movable contraction wall has a flat surface coplanar with the cross section of the inflection point of the bicubic curve. The fixed contraction wall is fixed to the rear side wall. An adjustment mechanism is provided on the outside of the movable contraction wall to control the sliding of the movable contraction wall along the tangent direction of the inflection point of the bicubic curve.

2. The adjustable rectangular contraction flow channel structure according to claim 1, characterized in that: A boss is provided on the outside of the movable contraction wall, and the adjustment mechanism includes a slider arranged on the boss, a guide rail arranged parallel to the tangent direction of the inflection point of the bicubic curve, a telescopic cylinder connected to the boss and providing sliding force for the movable contraction wall, the telescopic rod of the telescopic cylinder is hinged to the boss, and the slider and the guide rail are matched.

3. The adjustable rectangular contraction flow channel structure according to claim 2, characterized in that: It also includes a cover plate that is fitted with the outer side of the fixed contraction wall, and a support frame is provided on the cover plate for installing a fixed telescopic cylinder.

4. The adjustable rectangular contraction flow channel structure according to claim 3, characterized in that: The number of guide rails is 2.

5. The adjustable rectangular contraction flow channel structure according to claim 2, 3 or 4, characterized in that: The telescopic cylinder is any one of an electric cylinder, a hydraulic cylinder and a pneumatic cylinder.

6. The adjustable rectangular contraction flow channel structure according to claim 1, characterized in that: A boss is provided on the outer side of the movable contraction wall, and a threaded hole is provided on the boss. The adjustment mechanism includes a fixed screw that can be screwed with the threaded hole. The fixed screw is arranged parallel to the tangent direction of the inflection point of the bicubic curve.

7. The adjustable rectangular contraction flow channel structure according to any one of claims 1 to 4 and 6, characterized in that: The movable contraction wall is provided with sealing strips at the contact positions with the front side wall and the rear side wall.

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