A wind tunnel bladeless ring gap jet air supply device and air supply method

Abstract

The application belongs to the technical field of wind tunnel test, and particularly relates to a wind tunnel bladeless gap jet air supply device and an air supply method. The device comprises a cylinder one and a cylinder two, and a bladeless air supply assembly is connected between the cylinder one and the cylinder two. The bladeless air supply assembly replaces the traditional paddle fan or vortex fan, so that the air flow rate at each position in the cylinder one is kept consistent. In the case that the air amount supplied into the cylinder one by the bladeless air supply assembly is unchanged, the air flow rate of the air in the cylinder one is adjusted by changing the aperture size of the flexible cylinder center in the wind speed adjusting mechanism. The air flowing through the wind speed adjusting mechanism is uniformly dispersed by the uniform dispersion mechanism, so that the flow rates at each position after the air in the cylinder one flows through the uniform dispersion mechanism tend to be consistent. When the air flow is used for experiment, the experimental results are not affected by the position of the experimental object in the cylinder one. Therefore, the wind tunnel pipeline required by the device is relatively short.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind tunnel test, in particular to a wind tunnel no-blade annular gap jet air supply device and method. BACKGROUND

[0002] Wind tunnels are widely used in the test experiments of aerodynamics. By placing terrain and objects in the form of scaled models in the wind tunnel and measuring the wind force or wind speed acting on the model with instruments, a lot of data that are difficult to measure in actual work can be obtained. Some studies have also shown that the results of wind tunnel experiments are similar to those of on-site wind field observations, so wind tunnel experiments are the most commonly used method for studying many wind engineering problems.

[0003] Common wind tunnels usually use paddle fans or vortex fans. Since the wind speed at the center of the outlet and the edge of the above two fans is not the same, a relatively long pipe needs to be adapted to make the air flow rate in each part of the pipe consistent, and this situation is even more pronounced when adjusting the fan speed. In order to shorten the length of the pipe adapted for the wind tunnel, a wind tunnel no-blade annular gap jet air supply device and method are proposed. SUMMARY

[0004] The present application proposes a wind tunnel no-blade annular gap jet air supply device and method to solve the shortcomings in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: a wind tunnel no-blade annular gap jet air supply device, comprising a cylinder one and a cylinder two, a no-blade air supply assembly is connected between the cylinder one and the cylinder two, a wind speed adjusting mechanism and a uniform dispersion mechanism are installed in the cylinder one, the uniform dispersion mechanism is located on the side of the wind speed adjusting mechanism away from the no-blade air supply assembly, the wind speed adjusting mechanism is used to change the size of the channel through which air flows in the cylinder one, and the uniform dispersion mechanism is used to uniformly disperse air discharged from the wind speed adjusting mechanism.

[0006] Preferably, the no-blade air supply assembly comprises a cylinder three, the cylinder one and the cylinder two are fixedly sleeved outside the cylinder three, a flow guide cylinder one and a flow guide cylinder two are fixedly installed at both ends of the cylinder three, respectively, a flow guide cavity is formed between the cylinder three and the flow guide cylinder two, an air outlet is formed between the flow guide cylinder two and the flow guide cylinder one, an air inlet cylinder is fixedly installed on the cylinder three in a penetrating manner, and a fan is fixedly installed at the bottom end of the air inlet cylinder.

[0007] Preferably, the wind speed adjusting mechanism comprises two external thread cylinders, the outer sides of the two external thread cylinders are threadedly connected with the inner wall of the cylinder one, a rotating ring is fixedly installed on each side of the two external thread cylinders that are close to each other, and a flexible cylinder is fixedly installed between the two rotating rings, the two rotating rings are used to drive the flexible cylinder to move spirally in opposite directions at both ends.

[0008] Preferably, the two rotating rings are fixedly installed with end face gear rings on the side close to each other, the two end face gear rings are meshingly connected with spur gears, a sliding slot and a through hole are formed on one side wall of the cylinder, two mirror image L-shaped frames are slidingly installed in the sliding slot, two rotating shafts are penetratingly and rotatably installed on the two L-shaped frames, the bottom ends of the two rotating shafts extend into the cylinder through the through hole and are fixedly connected with the corresponding spur gears, the top ends of the two rotating shafts are fixedly installed with bevel gears one, the two bevel gears one are meshingly connected with bevel gears two, the two bevel gears two are rotatably connected with the corresponding L-shaped frames, the wind speed adjusting mechanism comprises a shell fixedly installed on the outside of the cylinder, a double-shaft motor fixedly installed on the inner wall of the shell, prisms fixedly installed on the both ends of the output shaft of the double-shaft motor, the two prisms penetratingly and slidingly connected with the corresponding L-shaped frames and bevel gears two, and the same tension spring fixedly installed between the L-shaped frame and the double-shaft motor.

[0009] Preferably, the uniform scattering mechanism comprises an annular mesh plate one fixedly connected with the inner wall of the cylinder one, a plurality of coaxially arranged annular mesh plates two slidingly installed on the inner side of the annular mesh plate one, a cylinder one fixedly installed on the side of the annular mesh plate one away from the cylinder two, and a cylinder two fixedly installed on the side of each annular mesh plate two away from the cylinder one, wherein the inner diameter of each cylinder two is equal to the inner diameter of the corresponding annular mesh plate two, the outermost annular mesh plate two is slidingly connected with the inner wall of the cylinder one, the remaining annular mesh plates two are slidingly connected with the inner walls of the corresponding cylinders two, and the innermost cylinder two is slidingly installed with a circular mesh plate.

[0010] Preferably, a pin shaft is fixedly installed on the inner side of the annular mesh plate one, and frames are fixedly installed on the inner sides of the plurality of annular mesh plates two, the uniform scattering mechanism further comprises a scissor-type telescopic frame, one end of the scissor-type telescopic frame is hingedly connected with the center of the circular mesh plate, the other end of the scissor-type telescopic frame is hingedly connected with a pull plate, a horizontal rod is fixedly installed on the other end of the pull plate, and the horizontal rod is rotatably connected with the adjacent rotating ring.

[0011] Preferably, a pin shaft is fixedly installed on the inner side of the annular mesh plate one, and frames are fixedly installed on the inner sides of the plurality of annular mesh plates two, the uniform scattering mechanism further comprises a scissor-type telescopic frame, one end of the scissor-type telescopic frame is hingedly connected with the center of the circular mesh plate, the other end of the scissor-type telescopic frame is hingedly connected with a pull plate, a horizontal rod is fixedly installed on the other end of the pull plate, and the horizontal rod is rotatably connected with the adjacent rotating ring.

[0012] Preferably, a guide cone cylinder is fixedly installed on the inner wall of the cylinder two, and one end of the guide cone cylinder is fixedly connected with the inner wall of the guide cylinder two.

[0013] A wind tunnel vaneless annular gap jet air supply method, applicable to the wind tunnel vaneless annular gap jet air supply device, comprising the following steps:

[0014] S1, the vaneless air supply assembly sucks external air into the cylinder one and makes the air flow from one side of the cylinder two to the cylinder one.

[0015] S2, in the case that the air intake amount into the cylinder one of the bladeless air supply assembly is unchanged, the air flow size through the passage when the air flows through the cylinder one is changed by the air speed adjusting mechanism, so as to change the flow speed of the air in the cylinder one after the air passes through the air speed adjusting mechanism;

[0016] S3, the uniform dispersion mechanism is used to uniformly disperse the air discharged from the air speed adjusting mechanism, so as to make the air fill the cylinder one.

[0017] Compared with the prior art, the beneficial effects of the present application are:

[0018] The present application replaces the traditional paddle fan or vortex fan with the bladeless air supply assembly, so that the air flow speed into each position in the cylinder one is kept consistent, and in the case that the air amount supplied into the cylinder one by the bladeless air supply assembly is unchanged, the air flow speed in the cylinder one is adjusted by changing the aperture size of the flexible cylinder center in the air speed adjusting mechanism;

[0019] The air flowing through the air speed adjusting mechanism is uniformly dispersed by the uniform dispersion mechanism, so as to ensure that the flow speed of the air after flowing through the uniform dispersion mechanism in each position in the cylinder one tends to be consistent, and the experimental results are not affected by the position of the experimental object in the cylinder one when the air is used for experiment, therefore, the wind tunnel pipeline required by the device is shorter. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a whole structure schematic diagram of a wind tunnel bladeless annular gap jet air supply device proposed by the present application;

[0021] Figure 2 It is a front view sectional view of a wind tunnel bladeless annular gap jet air supply device proposed by the present application;

[0022] Figure 3 It is a front view sectional view of a bladeless air supply assembly in a wind tunnel bladeless annular gap jet air supply device proposed by the present application;

[0023] Figure 4 It is a partial sectional view of a wind tunnel bladeless annular gap jet air supply device proposed by the present application;

[0024] Figure 5 It is Figure 4 It is an enlarged structure schematic diagram of part A;

[0025] Figure 6 It is a partial sectional view of an air speed adjusting mechanism in a wind tunnel bladeless annular gap jet air supply device proposed by the present application;

[0026] Figure 7 It is a sectional view of a uniform dispersion mechanism in a wind tunnel bladeless annular gap jet air supply device proposed by the present application.

[0027] Fig. 1, barrel one; 11, chute; 12, through hole; 2, barrel two; 21, guide cone barrel; 3, bladeless air supply assembly; 4, air speed adjusting mechanism; 5, uniform dispersion mechanism;

[0028] 31, barrel three; 32, guide barrel one; 33, guide barrel two; 34, guide cavity; 35, air outlet; 36, air inlet barrel; 37, fan;

[0029] 41, outer threaded barrel; 42, rotating ring; 43, flexible barrel; 44, end face gear ring; 45, straight gear; 46, shell; 47, double-shaft motor; 48, prism; 49, L-shaped frame; 410, rotating shaft; 411, bevel gear one; 412, bevel gear two; 413, tension spring;

[0030] 51, annular mesh plate one; 52, cylinder one; 53, annular mesh plate two; 54, circular mesh plate; 55, scissor-type telescopic frame; 56, pin shaft; 57, frame; 58, pull plate; 59, crossbar; 510, cylinder two. DETAILED DESCRIPTION

[0031] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0032] Please refer to Figure 1 - Figure 7 The present application provides a technical solution: a wind tunnel bladeless annular gap jet air supply device, comprising a barrel one 1 and a barrel two 2, a bladeless air supply assembly 3 is connected between the barrel one 1 and the barrel two 2, an air speed adjusting mechanism 4 and a uniform dispersion mechanism 5 are installed in the barrel one 1, the uniform dispersion mechanism 5 is located on the side of the air speed adjusting mechanism 4 away from the bladeless air supply assembly 3, the air speed adjusting mechanism 4 is used to change the size of the passage through which the air flows through the barrel one 1, and the uniform dispersion mechanism 5 is used to uniformly disperse the air discharged from the air speed adjusting mechanism 4.

[0033] The bladeless air supply assembly 3 comprises a barrel three 31, the barrel one 1 and the barrel two 2 are fixedly sleeved outside the barrel three 31, a guide barrel one 32 and a guide barrel two 33 are fixedly installed at both ends of the barrel three 31 respectively, a guide cavity 34 is formed between the barrel three 31 and the guide barrel two 33, an air outlet 35 is formed between the guide barrel two 33 and the guide barrel one 32, an air inlet barrel 36 is fixedly installed in a penetrating manner on the barrel three 31, and a fan 37 is fixedly installed at the bottom end of the air inlet barrel 36.

[0034] The wind speed regulating mechanism 4 includes two external threaded cylinders 41. The outer sides of the two external threaded cylinders 41 are threadedly connected to the inner wall of the cylinder body 1. A rotating ring 42 is fixedly installed on the side of the two external threaded cylinders 41 that is close to each other. A flexible cylinder 43 is fixedly installed between the two rotating rings 42. The two rotating rings 42 are used to drive the two ends of the flexible cylinder 43 to move spirally in opposite directions.

[0035] Two rotating rings 42 are each fixedly mounted with an end face gear ring 44 on their adjacent sides. Spur gears 45 are meshed on both end face gear rings 44. A sliding groove 11 and a through hole 12 are provided on the side wall of the cylinder 1. Two mirror-distributed L-shaped brackets 49 are slidably mounted in the sliding groove 11. A rotating shaft 410 is rotatably mounted through each of the two L-shaped brackets 49. The bottom ends of both rotating shafts 410 extend through the through hole 12 into the cylinder 1 and are fixedly connected to the corresponding spur gears 45. A bevel gear 411 is fixedly mounted on the top of each of the two rotating shafts 410. Both bevel gears 411 are meshed on... There is a second bevel gear 412, and the two bevel gears 412 are rotatably connected to the corresponding L-shaped frame 49 respectively. The wind speed adjustment mechanism 4 includes a housing 46 fixedly installed on the outside of the cylinder 1. A dual-axis motor 47 is fixedly installed on the inner wall of the housing 46. Prisms 48 are fixedly installed at both ends of the output shaft of the dual-axis motor 47. The two prisms 48 pass through the corresponding L-shaped frame 49 and the second bevel gear 412 respectively and are slidably connected to the corresponding L-shaped frame 49 and the second bevel gear 412. The same tension spring 413 is fixedly installed between the L-shaped frame 49 and the dual-axis motor 47. The tension spring 413 is sleeved on the outside of the prism 48.

[0036] Furthermore, such as Figure 3 - Figure 6 As shown, when the dual-axis motor 47 drives the two prisms 48 to rotate clockwise, the two prisms 48 then drive the corresponding bevel gears 412 to rotate, and the two bevel gears 412 then drive the corresponding bevel gears 411 to rotate [the left bevel gear 411 rotates counterclockwise, and the right bevel gear 411 rotates clockwise]. The two bevel gears 411 then drive the two spur gears 45 to rotate via the corresponding rotating shaft 410 [the left spur gear 45 rotates counterclockwise, and the right spur gear 45 rotates clockwise]. [Rotation], the two spur gears 45 then drive the two end face gear rings 44 to rotate [the left end face gear ring 44 rotates counterclockwise, and the right end face gear ring 44 rotates clockwise], the two end face gear rings 44 then drive the two rotating rings 42 and the two external threaded cylinders 41 to rotate [the left external threaded cylinder 41 rotates counterclockwise, and the right external threaded cylinder 41 rotates clockwise], during this process, the two external threaded cylinders 41 rotate spirally and move closer to each other, causing the left half of the flexible cylinder 43 to rotate counterclockwise and the right half to rotate clockwise;

[0037] With the above, as the left half of the flexible cylinder 43 rotates counterclockwise and the right half rotates clockwise, the originally straight flexible cylinder 43 will become funnel-shaped. The size of the middle hole of the funnel-shaped flexible cylinder 43 can be adjusted according to requirements. In the case that the air intake amount on the right side of the flexible cylinder 43 remains unchanged, the air outlet speed on the left side of the flexible cylinder 43 will be inversely proportional to the size of the middle hole of the funnel-shaped flexible cylinder 43.

[0038] With the above, during the process of the two L-shaped frames 49 moving closer to each other or moving away from each other, the bevel gear two 412 will slide on the prism 48. Even if the position of the bevel gear two 412 on the prism 48 changes, the prism 48 can always drive the bevel gear two 412 to rotate synchronously.

[0039] With the above, by setting the tension spring 413, it can be ensured that the straight gear 45 and the end face gear ring 44 can always remain in meshing state during the left and right movement of the L-shaped frame 49.

[0040] The uniform scattering mechanism 5 comprises an annular mesh plate one 51 fixedly connected with the inner wall of the cylinder one 1, a plurality of coaxially arranged annular mesh plates two 53 slidably installed on the inner side of the annular mesh plate one 51, a cylindrical one 52 fixedly installed on the side of the annular mesh plate one 51 away from the cylinder two 2, and a plurality of cylindrical two 510 fixedly installed on the side of each annular mesh plate two 53 away from the cylinder one 1. The inner diameter of each cylindrical two 510 is equal to the inner diameter of the corresponding annular mesh plate two 53. The outermost annular mesh plate two 53 is slidably connected with the inner wall of the cylindrical one 52, and the remaining annular mesh plates two 53 are slidably connected with the inner wall of the corresponding cylindrical two 510. The innermost cylindrical two 510 slidably installs a circular mesh plate 54.

[0041] The inner side of the annular mesh plate one 51 is fixedly installed with a pin shaft 56, and the inner side of each annular mesh plate two 53 is fixedly installed with a frame 57. The uniform scattering mechanism 5 further comprises a scissor-type telescopic frame 55, one end of which is hingedly connected with the center of the circular mesh plate 54, and the other end of the scissor-type telescopic frame 55 is hingedly connected with a pull plate 58. The other end of the pull plate 58 is fixedly installed with a crossbar 59, and the crossbar 59 is rotatably connected with the adjacent rotating ring 42.

[0042] The hinged part of each two adjacent X-shaped scissor units of the scissor-type telescopic frame 55 is provided with a pin shaft 56. The two pin shafts 56 close to the pull plate 58 are slidably installed in the pin shaft 56, and the remaining pin shafts 56 are slidably installed in the corresponding frames 57.

[0043] Further, when the left and right parts of the flexible cylinder 43 rotate in opposite directions to become funnel-shaped, as the middle hole of the funnel-shaped flexible cylinder 43 continuously becomes smaller, the crossbar 59 will be pulled to the right to the bladeless air supply assembly 3;

[0044] As Figure 7As shown, when the horizontal rod 59 moves to the right, the scissor-type telescopic frame 55 will be extended under the action of the pull plate 58. At this time, the circular mesh plate 54 and the plurality of annular mesh plates two 53 will move synchronously, so that the annular mesh plates one 51, the circular mesh plate 54 and the plurality of annular mesh plates two 53 originally in the same plane will change into a conical tower shape, and the middle aperture of the funnel-shaped flexible cylinder 43 will become smaller and smaller, and the distance between the circular mesh plate 54 and the flexible cylinder 43 will be larger;

[0045] As mentioned above, during the process that the air flows from right to left through the funnel-shaped flexible cylinder 43, the air flow rate at the center of the left side of the funnel-shaped flexible cylinder 43 is the largest, and the farther away from the center of the left side of the funnel-shaped flexible cylinder 43, the lower the air flow rate will be;

[0046] When the middle aperture of the funnel-shaped flexible cylinder 43 becomes smaller, the speed of the air after flowing through the flexible cylinder 43 will be faster. At this time, since the distance between the center of the flexible cylinder 43 and the circular mesh plate 54 becomes larger, the speed of the air after flowing for a period of time will be reduced, and then the speed of the air at the center will be slower when passing through the circular mesh plate 54;

[0047] As mentioned above, the air with different flow rates at the left side of the funnel-shaped flexible cylinder 43 will pass through the annular mesh plates two 53 and the annular mesh plates one 51 at different distances, and the faster the air flow rate, the larger the distance between the air and the corresponding annular mesh plates two 53;

[0048] As mentioned above, the air with the lowest flow rate at the outermost left side of the funnel-shaped flexible cylinder 43 has the smallest distance to the annular mesh plates one 51. At this time, since the distance between the air and the annular mesh plates one 51 is the smallest, the flow rate of the air will not change much, and the speed of the air passing through the circular mesh plate 54 will be faster;

[0049] As mentioned above, it can be ensured that the air discharged from the left side of the funnel-shaped flexible cylinder 43 not only can fill the entire cylinder one 1 after passing through the conical tower-shaped annular mesh plates one 51, the circular mesh plate 54 and the plurality of annular mesh plates two 53, but also can make the flow rates of the air after flowing through the diffusion mechanism 5 consistent.

[0050] The inner wall of the cylinder two 2 is fixedly installed with a flow guide cone cylinder 21, and one end of the flow guide cone cylinder 21 is fixedly connected with the inner wall of the flow guide cylinder two 33.

[0051] A wind tunnel bladeless annular gap jet air supply method, which is suitable for the wind tunnel bladeless annular gap jet air supply device, comprises the following steps:

[0052] S1, the bladeless air supply assembly 3 sucks external air into the cylinder one 1, and makes the air flow from one side of the cylinder two 2 to the cylinder one 1;

[0053] S2, under the condition that the air intake amount of the bladeless air supply assembly 3 into the cylinder 1 is unchanged, the air flow rate in the cylinder 1 after passing through the air speed adjusting mechanism 4 is changed by changing the passage size of the air flow through the cylinder 1, so as to change the air flow rate in the cylinder 1 after passing through the air speed adjusting mechanism 4;

[0054] S3, the uniform dispersion mechanism 5 is used to uniformly disperse the air discharged from the air speed adjusting mechanism 4, so as to make the air fill the cylinder 1.

[0055] In the embodiment: the fan 37 is started, the fan 37 sucks and sends the external air into the cylinder 3 1 and makes the air fill the flow guide cavity 34, then the air is discharged from the air outlet 35, the air discharged from the air outlet 35 enters into the cylinder 1 and then passes through the flexible cylinder 43, then passes through the uniform dispersion of the plurality of uniform dispersion mechanisms 5, so as to make the air fill the cylinder 1 after passing through the uniform dispersion of the uniform dispersion mechanism 5, and ensure that the flow rates of the parts after passing through the uniform dispersion mechanism 5 are consistent.

[0056] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art in the technical range disclosed by the present application, according to the technical scheme and the inventive concept of the present application, equivalent replacement or change, should be covered in the protection scope of the present application.

Claims

1. A bladeless annular gap jet air supply device for wind tunnels, comprising a first cylinder (1) and a second cylinder (2), characterized in that: A bladeless air supply assembly (3) is connected between the first cylinder (1) and the second cylinder (2). A wind speed regulating mechanism (4) and a uniform distribution mechanism (5) are installed inside the first cylinder (1). The uniform distribution mechanism (5) is located on the side of the wind speed regulating mechanism (4) away from the bladeless air supply assembly (3). The wind speed regulating mechanism (4) is used to change the size of the channel through which the air flows through the first cylinder (1). The uniform distribution mechanism (5) is used to evenly distribute the air discharged from the wind speed regulating mechanism (4). The bladeless air supply assembly (3) includes a cylinder three (31), a cylinder one (1) and a cylinder two (2) fixedly sleeved on the outside of the cylinder three (31), a guide cylinder one (32) and a guide cylinder two (33) fixedly installed at both ends of the cylinder three (31), a guide cavity (34) is formed between the cylinder three (31) and the guide cylinder two (33), an air outlet (35) is formed between the guide cylinder two (33) and the guide cylinder one (32), an air inlet cylinder (36) is fixedly installed through the cylinder three (31), and a fan (37) is fixedly installed at the bottom of the air inlet cylinder (36). The wind speed regulating mechanism (4) includes two external threaded cylinders (41). The outer sides of the two external threaded cylinders (41) are threadedly connected to the inner wall of the cylinder body (1). Rotating rings (42) are fixedly installed on the side of the two external threaded cylinders (41) that are close to each other. A flexible cylinder (43) is fixedly installed between the two rotating rings (42). The two rotating rings (42) are used to drive the two ends of the flexible cylinder (43) to move spirally in opposite directions. The equalization mechanism (5) includes an annular mesh plate (51) fixedly connected to the inner wall of the cylinder (1). Multiple annular mesh plates (53) are slidably installed on the inner side of the annular mesh plate (51). A cylindrical plate (52) is fixedly installed on the side of the annular mesh plate (51) away from the cylinder (2). A cylindrical plate (510) is fixedly installed on the side of the multiple annular mesh plates (53) away from the cylinder (1). The inner diameter of each cylindrical plate (510) is equal to the inner diameter of the corresponding annular mesh plate (53). The outermost annular mesh plate (53) is slidably connected to the inner wall of the cylinder (52). The remaining annular mesh plates (53) are slidably connected to the inner wall of the corresponding cylindrical plate (510). A circular mesh plate (54) is slidably installed inside the innermost cylindrical plate (510).

2. The wind tunnel bladeless annular gap jet air supply device according to claim 1, characterized in that: Two rotating rings (42) are fixedly mounted on the side of each other with end face gear rings (44). Both end face gear rings (44) are meshed with spur gears (45). The side wall of the cylinder (1) is provided with a sliding groove (11) and a through hole (12). Two mirror-distributed L-shaped frames (49) are slidably mounted in the sliding groove (11). Both L-shaped frames (49) are rotatably mounted with rotating shafts (410). The bottom ends of both rotating shafts (410) extend through the through hole (12) into the cylinder (1) and are fixedly connected to the corresponding spur gears (45). Both rotating shafts (410) are fixedly mounted with bevel gears (411) at the top ends. Both bevel gears (411) are meshed with bevel gears (411). (412), two bevel gears (412) are rotatably connected to the corresponding L-shaped frame (49) respectively. The wind speed adjustment mechanism (4) includes a housing (46) fixedly installed on the outside of the cylinder (1). A dual-axis motor (47) is fixedly installed on the inner wall of the housing (46). A prism (48) is fixedly installed at both ends of the output shaft of the dual-axis motor (47). The two prisms (48) pass through the corresponding L-shaped frame (49) and bevel gear (412) respectively and are slidably connected to the corresponding L-shaped frame (49) and bevel gear (412). The same tension spring (413) is fixedly installed between the L-shaped frame (49) and the dual-axis motor (47). The tension spring (413) is sleeved on the outside of the prism (48).

3. The wind tunnel bladeless annular gap jet air supply device according to claim 1, characterized in that: A pin (56) is fixedly installed on the inner side of the first annular mesh plate (51), and a frame (57) is fixedly installed on the inner side of each of the second annular mesh plates (53). The distribution mechanism (5) also includes a scissor telescopic frame (55). One end of the scissor telescopic frame (55) is hinged to the center of the circular mesh plate (54), and the other end of the scissor telescopic frame (55) is hinged to a pull plate (58). A crossbar (59) is fixedly installed on the other end of the pull plate (58), and the crossbar (59) is rotatably connected to the adjacent rotating ring (42).

4. The wind tunnel bladeless annular gap jet air supply device according to claim 3, characterized in that: The hinge of each pair of adjacent X-shaped scissor units of the scissor telescopic frame (55) is provided with a pin (56). Two pins (56) near the pull plate (58) are slidably installed in the pins (56), and the remaining pins (56) are slidably installed in the corresponding frames (57).

5. The wind tunnel bladeless annular gap jet air supply device according to claim 1, characterized in that: A flow guide cone (21) is fixedly installed on the inner wall of the second cylinder (2), and one end of the flow guide cone (21) is fixedly connected to the inner wall of the second cylinder (33).

6. A method for bladeless annular jet air supply in a wind tunnel, applicable to the bladeless annular jet air supply device of claim 1, characterized in that: Includes the following steps: S1, the bladeless air supply assembly (3) draws in external air and sends it into cylinder one (1), and makes the air flow from one side of cylinder two (2) to cylinder one (1). S2, with the air intake volume of the bladeless air supply assembly (3) into the cylinder (1) remaining unchanged, the air speed adjustment mechanism (4) is used to change the size of the channel through which the air flows through the cylinder (1), thereby changing the air speed in the cylinder (1) after passing through the air speed adjustment mechanism (4). S3, the uniform dispersion mechanism (5) is used to uniformly disperse the air discharged from the wind speed regulating mechanism (4), so that the air can fill the cylinder (1).

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