An airflow generating device that can be used for experimental research

Abstract

The present invention discloses an airflow generating device for experimental research, which belongs to a gas generating device and includes a cylinder having a through hole at one end thereof, a telescopic membrane fixed to the cylinder, a socket at the center of the telescopic membrane, a regulating tube passing through the socket, and the regulating tube formed by a curled elastic thin plate; a limiting assembly including: a ring-shaped sleeve mounted on the cylinder, the axis of the sleeve coinciding with the axis of the cylinder; a plurality of connecting plates disposed between the sleeve and the cylinder for securing the sleeve and the cylinder; a plurality of connecting rod assemblies disposed on corresponding connecting plates; the connecting rod assemblies including: a through slot disposed on the connecting plate and extending through the connecting plate in the X direction; a limiting rod passing through the through slot and rotatably connected to the connecting plate by an axis; the B end of the limiting rod abutting the outer wall of the regulating tube, and the limiting rod can limit the expansion of the regulating tube by rotation; and a generating device disposed on the cylinder. This device can change the volume of the cylinder and the diameter of the regulating tube, providing more data for vortex ring experiments.

Description

Technical Field

[0001] The invention belongs to a gas generating device, and in particular relates to an airflow generating device which can be used for experimental research. Background Art

[0002] The vortex ring generating device in the laboratory mainly creates disturbances in the air and ejects it quickly by rapidly compressing the air, creating a phenomenon similar to an air cannon.

[0003] The current vortex ring generating device can only change the speed of air compression, but cannot change the diameter of the air nozzle or the volume of the air storage chamber. Therefore, the number of control tests that can be carried out is limited, and the amount of data obtained is small. Summary of the Invention

[0004] The airflow generating device of the present invention can be used for experimental research, and can change the caliber of an air nozzle and the volume of an air storage cavity.

[0005] An airflow generating device useful for experimental research according to the present invention comprises a cylinder having a cavity defined therein, the axis of the cylinder being arranged along the X-direction, a through hole defined at one end of the cylinder along the X-direction, a telescopic membrane fixed to the cylinder, the outer wall of the telescopic membrane being bonded to the inner wall of the cylinder, an insertion hole being defined in the middle of the telescopic membrane, the axis of the insertion hole coinciding with the axis of the cylinder;

[0006] An adjustment tube is passed through the jack. The adjustment tube is formed by curling an elastic thin plate. When viewed in the X direction, the adjustment tube is tubular. The adjustment tube can expand outwards by its own elastic force, and the stretch membrane can adaptively deform as the adjustment tube expands.

[0007] The invention also includes a restriction assembly for limiting outward expansion of the regulating tube, the restriction assembly including:

[0008] The sleeve frame is annular and sleeved on the cylinder, and the axis of the sleeve frame coincides with the axis of the cylinder;

[0009] A plurality of connecting plates are located between the sleeve and the cylinder and are used to fix the sleeve and the cylinder. All the connecting plates are arranged in a circular array along the axis of the sleeve.

[0010] A plurality of connecting rod assemblies are arranged on corresponding connecting plates; the connecting rod assemblies include:

[0011] A through slot is provided on the connecting plate and penetrates the connecting plate along the X direction;

[0012] The limiting rod is inserted into the through slot and is connected to the connecting plate by means of a shaft. The plane where the axis of the limiting rod is located is parallel to the end face of the cylinder. The B end of the limiting rod abuts against the outer wall of the regulating tube. The limiting rod can limit the expansion of the regulating tube by rotating.

[0013] The cylinder is provided with a generating device for generating a vortex ring at the end of the regulating tube.

[0014] Furthermore, the sleeve is rotatably connected to a rotating frame, the rotating frame is annular, and the axis of the rotating frame coincides with the axis of the sleeve;

[0015] A mounting frame is fixed to the outer wall of the cylinder; a driving motor is provided on the mounting frame, the non-rotating shaft end of the driving motor is fixed to the mounting frame, and the axis of the rotating shaft of the driving motor is along the X direction; a driving gear is fixed to the rotating shaft of the driving motor, and the axis of the driving gear coincides with the axis of the rotating shaft of the driving motor; a rotating rack is fixedly connected to the rotating frame, and the rotating rack is arc-shaped. When viewed in the X direction, its center coincides with the center of the frame, and the driving gear is meshed with the rotating rack;

[0016] A first connecting rod is provided on the rotating frame, one end of the first connecting rod is rotatably connected to the rotating frame, the axis of the hinge shaft of this end of the first connecting rod is along the X direction, and the other end is not connected to the sleeve frame and the rotating frame;

[0017] A second connecting rod is rotatably connected to the sleeve. When viewed in the X direction, the shape of the second connecting rod is L-shaped. One end of the first connecting rod is rotatably connected to the sleeve, and the other end can abut against the A end of the limiting rod. The middle part of the second connecting rod is rotatably connected to the other end of the first connecting rod, and the axis of the hinge shaft at the other end of the first connecting rod is along the X direction.

[0018] The drive motor electrically drives the rotating rack and the rotating frame, which in turn rotate the limiting rod via the first and second connecting rods. The limiting rod's B end tightens the regulating tube toward the center of the cylinder, reducing its diameter. The opposite effect occurs when the rod is turned. Electric control ensures simple operation.

[0019] Furthermore, the cylinder body is composed of a first cylinder member and a second cylinder member. The first cylinder member and the second cylinder member are similar in shape and both include a cylindrical cylinder seat. A plurality of cylinder blocks are fixed to the end surface of the cylinder seat without a bottom surface. The cylinder blocks are arranged in a circular array along the axis of the cylinder seat, and a slot is formed between two adjacent cylinder blocks. When the first cylinder member and the second cylinder member form the cylinder body, the cylinder block of the first cylinder member is located in the slot of the second cylinder member, and the cylinder block of the second cylinder member is located in the slot of the first cylinder member.

[0020] Each slot is bonded with an elastic film for sealing the slot; a through hole is provided on the first cylinder, the sleeve is fixed to the first cylinder via a connecting plate, and the generating device is provided on the second cylinder;

[0021] A hydraulic telescopic rod is provided on the outer wall of the cylinder part 1, the non-telescopic end of the hydraulic telescopic rod is fixed on the outer wall of the cylinder part 1, the telescopic end of the hydraulic telescopic rod is fixed on the outer wall of the cylinder part 2, and the axis of the hydraulic telescopic rod is along the X direction.

[0022] The volume of the cylinder can be changed, and after the volume is changed, the elastic membrane is used to maintain the sealing of the slot. Relevant experiments can be done to determine whether the change in the cylinder volume has an impact on the vortex ring, and more experimental data are available.

[0023] Furthermore, the generating device comprises:

[0024] The generating motor has a non-rotating shaft end fixed on the outer bottom surface of the cylinder seat of the second cylinder, and the axis of the rotating shaft of the generating motor is along the radial direction of the second cylinder;

[0025] The driving gear is fixed on the rotating shaft of the generating motor, and the axis of the driving gear coincides with the rotating shaft of the generating motor;

[0026] The generating rack is provided on the bottom surface of the cylinder seat of the cylinder member 2. A hole for the generating rack to pass through is provided on the bottom surface of the cylinder seat of the cylinder member 2. The generating rack can move along the X direction. The generating rack 23 is engaged with the driving gear. One end of the generating rack extends into the interior of the cylinder body.

[0027] The push plate is fixed to one end of the generating rack located inside the cylinder, and the peripheral wall of the push plate is in contact with the inner wall of the cylinder.

[0028] By electric means, the rapid movement of the push plate is used to automatically compress the air and generate a vortex ring.

[0029] Furthermore, the airflow generating device further includes a base assembly, and the base assembly includes:

[0030] a base plate having a cavity inside and placed on the ground;

[0031] The control motor has a non-rotating shaft end fixed in the cavity, and the rotating shaft of the control motor is arranged vertically and extends out of the cavity;

[0032] The support frame is fixed on the rotating shaft of the control motor and can rotate as a whole with the rotating shaft of the control motor;

[0033] The shell is fixed on the support frame, and the shell is fixedly connected to the sleeve frame.

[0034] The direction of the regulating tube can be changed by the base assembly, that is, the direction in which the vortex ring is generated from the regulating tube can be changed.

[0035] Furthermore, an anti-slip block is fixed on the inner wall of the cylinder, and a spring is installed on the anti-slip block. The compression direction of the spring is along the X direction. During the stroke, the push plate can compress the air inside the cylinder and can compress the spring together with the anti-slip block.

[0036] It can play a buffering role to avoid damage caused by direct collision between the push plate and the anti-slip block. Beneficial effects

[0037] The cylinder of the present invention is divided into cylinder 1 and cylinder 2, which can move relative to each other along the X direction to achieve the change of the volume of the cylinder. The device can be used to conduct a comparative test on the influence of volume change on the vortex ring.

[0038] The regulating tube of the present invention can be deformed by its own elasticity, thereby expanding the insertion hole and changing the outlet diameter of the vortex ring. The device can be used to conduct a comparative test on the influence of the outlet diameter change on the vortex ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] FIG1 is a schematic structural diagram of the air cylinder assembly of the present device;

[0040] Figure 2 Schematic diagram of the connection structure between the sleeve frame and the rotating frame;

[0041] Figure 3 Schematic diagram of the connection structure between the cylinder part 1 and the connecting plate;

[0042] Figure 4 It is a structural diagram of the limiting rod;

[0043] Figure 5 It is a schematic diagram of the connection structure between the push plate and the generating rack;

[0044] Figure 6 It is a schematic diagram of the overall structure of the device.

[0045] 1. Cylinder assembly; 11. Cylinder part 1; 12. Cylinder part 2; 13. Slot; 14. Telescopic membrane; 15. Adjusting tube; 16. Sleeve; 17. Connecting plate; 18. Rotating frame; 19. First connecting rod; 110. Second connecting rod; 111. Through slot; 112. Limiting rod; 113. Mounting frame; 114. Driving motor; 115. Driving gear; 116. Rotating rack; 117. Hydraulic telescopic rod; 118. Through hole; 2. Generating device; 21. Generating motor; 22. Driving gear; 23. Generating rack; 24. Push plate; 25. Anti-slip block; 3. Base assembly; 31. Base plate; 32. Control motor; 33. Support frame; 34. Housing. DETAILED DESCRIPTION

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0047] See Figure 1 , an airflow generating device that can be used for experimental research, including an air cylinder assembly 1, the air cylinder assembly 1 further including:

[0048] The cylinder, in this embodiment, is cylindrical in shape, and a cavity is provided inside the cylinder. The cylinder is composed of a cylinder part 11 and a cylinder part 2 12. The axis of the cylinder is along Figure 1 In the X direction, the cylinder 11 and the cylinder 2 12 can slide relative to each other along the X direction. Figure 3 Cylinder 1 11 and cylinder 2 12 have similar structures, both comprising a cylindrical cylinder base; a plurality of cylinder blocks integrally disposed on the end surface of the cylinder base without a bottom surface. The cylinder blocks are arranged in a circular array along the axis of the cylinder base, with slots 13 formed between adjacent cylinder blocks. When cylinder 1 11 and cylinder 2 12 form a cylindrical body, the cylinder blocks of cylinder 11 are located in the slots 13 of cylinder 2 12, and the cylinder blocks of cylinder 2 12 are located in the slots 13 of cylinder 1.

[0049] Multiple elastic membranes (not shown), the same as the total number of the slots 13 of the cylinder member 11 and the cylinder member 2 12, are fixed in the slots 13 of the corresponding cylinder member 11 or the cylinder member 2 12. The elastic membranes are fixedly connected to the surfaces of the slots 13 and are also fixedly connected to the end faces of the corresponding cylinder blocks to seal the gap between the cylinder member 11 and the cylinder member 2 12, that is, to ensure that the slots 13 of the two cylinder members 11 and 12 remain sealed when the cylinder member 11 and the cylinder member 2 12 move relative to each other.

[0050] Through hole 118, see Figure 3 , opened on the cylinder seat of cylinder member 11, the through hole 118 passes through the cylinder seat of cylinder member 11 along the X direction. In this embodiment, the diameter of the through hole 118 is equal to the inner diameter of the cylinder seat, and the axis of the through hole 118 coincides with the axis of the cylinder seat of cylinder member 11.

[0051] The telescopic membrane 14 is fixed to the inner wall of the cylinder 11 at the position of the through hole 118. In this embodiment, the telescopic membrane 14 is made of a thin rubber membrane that can elastically deform when subjected to force. The telescopic membrane 14 is in the shape of a ring, and the middle part of the telescopic membrane 14 is a socket. The axis of the telescopic membrane 14 coincides with the axis of the cylinder base. The outer wall of the telescopic membrane 14 is bonded and fixed to the inner wall of the cylinder base to maintain a seal.

[0052] The adjustment tube 15 can adjust its caliber. In this embodiment, the adjustment tube 15 is formed from a rectangular elastic metal sheet that is curled into a shape similar to a "steel coil." Viewed along the X-direction, the adjustment tube 15 resembles a tubular structure, and the axis of the adjustment tube 15 coincides with the axis of the cartridge holder. The adjustment tube 15 is inserted through the insertion hole of the telescopic membrane 14, with the outer wall of the adjustment tube 15 contacting the inner wall of the insertion hole of the telescopic membrane 14. Because the elastic metal sheet exhibits elasticity after being rolled into a coil, the adjustment tube 15 expands outward, squeezing the wall of the insertion hole of the telescopic membrane 14, causing the edge of the insertion hole of the telescopic membrane 14 to elastically deform toward the inner wall of the cartridge holder. This increases the caliber of the adjustment tube 15, and the inner diameter of the hole of the telescopic membrane 14 is also simultaneously expanded by the adjustment tube 15. Figure 3The jack and the regulating tube 15 are not shown.

[0053] See Figure 1 The airflow generating device further includes a limiting component for limiting the outer shape deformation of the regulating tube 15, and the limiting component includes:

[0054] The sleeve 16, in this embodiment, is annular and sleeved on the cylinder 11, the sleeve 16 is fixedly connected to the cylinder 11, and the axis of the sleeve 16 coincides with the axis of the cylinder 11.

[0055] Multiple connecting plates 17, see Figure 3 , located between the sleeve 16 and the outer wall of the cylinder 11, and the fixed sleeve 16, the connecting plate 17 and the cylinder 11 are fixed into a whole through the connecting plate 17. A plurality of connecting plates 17 are arranged in an array along the axis of the sleeve 16.

[0056] Rotating frame 18, see Figure 1 and Figure 2 In this embodiment, the rotating frame 18 is annular, the axis of the rotating frame 18 coincides with the axis of the sleeve 16, the rotating frame 18 is rotatably connected to the sleeve 16, and the rotating frame 18 can rotate around its axis relative to the sleeve 16.

[0057] Multiple connecting rod assemblies are arranged on the sleeve 16 and the rotating frame 18. The multiple connecting rod assemblies are arranged in a circular array along the axis of the sleeve 16 and are arranged one-to-one with the connecting plates 17. The connecting rod assembly includes:

[0058] First connecting rod 19, see Figure 2 One end is rotatably connected to the rotating frame 18, the axis of the hinge shaft of this end of the first connecting rod 19 is along the X direction, and the other end is not connected to either the sleeve frame 16 or the rotating frame 18;

[0059] The second connecting rod 110 is L-shaped when viewed along the X direction. One end of the second connecting rod 110 is rotatably connected to the sleeve frame 16, and the axis of the hinge axis of this end of the second connecting rod 110 is along the X direction. The middle part of the second connecting rod 110 is rotatably connected to the other end of the first connecting rod 19, and the axis of the hinge axis of the other end of the first connecting rod 19 is along the X direction.

[0060] Through slot 111, see Figure 1 and Figure 4 , opened on the connecting plate 17 and passing through the connecting plate 17 along the X direction.

[0061] Limit rod 112, see Figure 3 and Figure 4, passing through the through slot 111. A limiting rod 112 is pivotally connected to the inner wall of the through slot 111, with the axis of the limiting rod 112 lying parallel to the end face of the cylinder. The end of the second connecting rod 110, distal from its hinged end, abuts end A of the limiting rod 112, while end B of the limiting rod 112 abuts the outer wall of the regulating tube 15.

[0062] Also included is a drive assembly for rotating the rotating frame 18, the drive assembly including:

[0063] The mounting frame 113 is fixed on the outer circumferential wall of the cylinder 11;

[0064] The non-rotating shaft end of the driving motor 114 is fixed on the mounting bracket 113 , and the rotating shaft axis of the driving motor 114 is along the X direction.

[0065] The driving gear 115 is fixed on the rotating shaft of the driving motor 114 and coincides with the axis of the rotating shaft of the driving motor 114 .

[0066] The rotating rack 116 is in an arc shape. When viewed along the axis of the sleeve 16 , the center of the rotating rack 116 coincides with the center of the sleeve 16 . The rotating rack 116 is fixed to the rotating frame 18 . The rotating rack 116 is meshed with the driving gear 115 .

[0067] The hydraulic telescopic rod 117 is also included for relative movement of the first and second cylinders 11 and 12 along an axis parallel to the sleeve frame 16. The non-telescopic end of the hydraulic telescopic rod 117 is fixed to the circumferential sidewall of the first cylinder 11, while the telescopic end of the hydraulic telescopic rod 117 is fixed to the circumferential sidewall of the second cylinder 12. The axis of the hydraulic telescopic rod 117 is along the X-direction. In this embodiment, multiple hydraulic telescopic rods 117 are provided, each arranged in an array along the circumference of the axis of the first cylinder 11. A master switch for all hydraulic telescopic rods 117 is manually activated.

[0068] See Figure 1 , also includes a generating device 2 for quickly compressing the air inside the cylinder to generate a vortex ring at the outlet of the regulating pipe 15. The generating device 2 includes:

[0069] The non-rotating shaft end of the generating motor 21 is fixed to the outer surface of the cylinder seat of the second cylinder member 12 ; the rotating shaft axis of the generating motor 21 is along the radial direction of the second cylinder member 12 .

[0070] The driving gear 22 is fixed on the rotating shaft of the generating motor 21 , and its axis coincides with the rotating shaft of the generating motor 21 .

[0071] Occurrence rack 23, see Figure 5, is arranged on the bottom surface of the cylinder seat of the cylinder member 2 12, and a hole is opened on the bottom surface of the cylinder member 2 12 for the generation rack 23 to pass through, and the generation rack 23 can move along the X direction. One end of the generation rack 23 extends into the interior of the cylinder body, and the generation rack 23 is engaged with the driving gear 22.

[0072] The push plate 24 is fixed to one end of the generating rack 23 inside the cylinder. The peripheral wall of the push plate 24 fits the inner wall of the cylinder and is sealed with a rubber ring. When the push plate 24 and the generating rack 23 move as a whole along the X direction, the gas in the cylinder is squeezed from right to left by the push plate 24, and the gas in the cylinder is quickly squeezed out of the regulating tube 15, forming a vortex ring at the left end of the regulating tube 15.

[0073] Anti-drop block 25, see Figure 3 , fixed on the inner wall of the cylinder 11, Figure 1 From a visual perspective, when push plate 24 slides leftward in the X-direction to its maximum travel, it abuts against anti-slip block 25. Restricted by anti-slip block 25, push plate 24 cannot fully slide out of the cylinder. Anti-slip block 25 is mounted with a spring (not shown), which compresses in the X-direction. The spring is positioned between anti-slip block 25 and push plate 24. Before push plate 24 reaches its maximum travel, the spring compresses together with anti-slip block 25, cushioning any impact between push plate 24 and anti-slip block 25 and preventing damage to push plate 24.

[0074] See Figure 6 , further comprising a base assembly 3 for causing the vortex ring to change direction, the base assembly 3 comprising:

[0075] The base plate 31 has a cavity formed therein for being placed on the ground.

[0076] The non-rotating shaft end of the control motor 32 is fixed in the cavity, and the rotating shaft of the control motor 32 is arranged vertically and extends out of the cavity.

[0077] The support frame 33 is fixed on the rotating shaft of the control motor 32 and can rotate around the rotating shaft axis of the control motor 32 as a whole with the rotating shaft of the control motor 32.

[0078] The outer shell 34 is sleeved on the sleeve frame 16 and is cylindrical with a circular ring end surface. The inner wall of the outer shell 34 is fixedly connected to the outer wall of the sleeve frame 16. The outer shell 34 is fixedly connected to the support frame 33.

[0079] The process of using this device is:

[0080] (1) Methods for adjusting the volume of the cylinder cavity:

[0081] The operator only needs to manually turn on the main switch of hydraulic telescopic rod 117. Because cylinder 11, connecting plate 17, sleeve 16, housing 34, support frame 33, and base 31 are placed on the ground as a whole and their position does not move, the telescopic rod of hydraulic telescopic rod 117 pushes cylinder 2 12 away from cylinder 11 in the X direction. The elastic membrane between cylinders 11 and 12 also stretches adaptively, which causes the internal volume of the cylinder formed by cylinders 11 and 12 to increase. After hydraulic telescopic rod 117 stops and locks, it can maintain the increased volume of the cylinder. The increased volume of the cylinder can push more gas when push plate 24 moves, changing the test conditions.

[0082] (2) Methods for changing the diameter of the regulating tube:

[0083] The operator turns on the drive motor 114, which rotates the driving gear 115. Since the driving gear 115 is engaged with the rotating rack 116, the driving gear 115 causes the rotating rack 116 and the rotating frame 18 to rotate relative to the sleeve frame 16 around the axis of the sleeve frame 16 as a whole.

[0084] Assuming that the diameter of the regulating tube 15 needs to be enlarged, Figure 2 From the perspective of the rotation rack 116 and the rotating frame 18 rotate clockwise as a whole. After the rotating frame 18 rotates, it is linked in sequence through the first connecting rod 19 and the second connecting rod 110. The second connecting rod 110 moves away from one end thereof and the sleeve 16 and approaches the center of the sleeve 16. This end of the second connecting rod 110 presses the A end of the limiting rod 112, forcing the A end of the limiting rod 112 to approach the center of the sleeve 16. The limiting rod 112 rotates, and the B end of the limiting rod 112 produces the opposite action, that is, the B end of the limiting rod 112 moves away from the center of the sleeve 16.

[0085] When the B end of the limiting rod 112 is not far away from the center of the sleeve 16, because the B end of the limiting rod 112 abuts against the outer wall of the regulating tube 15, it plays the purpose of limiting the expansion of the regulating tube 15 to the outer shape. Therefore, when the B end of the limiting rod 112 is far away from the center of the sleeve 16, a certain space will be left between the outer wall of the regulating tube 15 and the B end of the limiting rod. The regulating tube 15 will be able to move freely due to the restoring force of its own elastic deformation. Figure 1 The expansion of the adjustment tube 15 outward from the perspective of the cylinder 11 increases the diameter of the adjustment tube 15. This also forces the expansion membrane 14 toward the inner wall of the cylinder 11, expanding the insertion hole of the expansion membrane 14 and accommodating the deformation of the adjustment tube 15. The diameter of the adjustment tube 15 can be adjusted by controlling the clockwise rotation angle of the rotating frame 18 by the drive motor 114. Within the adjustment range, the greater the clockwise rotation angle, the larger the diameter of the adjustment tube 15.

[0086] (3) Methods of generating vortex rings:

[0087] by Figure 1 As an initial state, the operator manually turns on the generating motor 21, and the generating motor 21 rotates the driving gear 22. Since the driving gear 22 is engaged with the generating rack 23, the generating rack 23 and the push plate 24 move leftward as a whole.

[0088] The push plate 24 quickly squeezes the air in the cylinder to the left, and finally the air in the cylinder is discharged from the regulating tube 15. Due to the rapid squeezing, the gas in the cylinder is disturbed, and a vortex ring is formed when the air in the cylinder is discharged from the regulating tube 15.

[0089] (4) Methods for adjusting the vortex ring angle:

[0090] The control motor 32 is manually turned on, and the control motor 32 causes the support frame 33, the housing 34 and the mechanism inside the housing 34 to rotate as a whole around the axis of the rotation shaft of the control motor 32, thereby achieving a change in the angle of the vortex ring.

[0091] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. An airflow generating device that can be used for experimental research, characterized in that: The invention comprises a cylinder, a cavity is provided inside the cylinder, the axis of the cylinder is arranged along the X direction, a through hole (118) is provided at one end of the cylinder along the X direction, a telescopic film (14) is fixed on the cylinder, the outer wall of the telescopic film (14) is bonded to the inner wall of the cylinder, an insertion hole is provided in the middle of the telescopic film (14), and the axis of the insertion hole coincides with the axis of the cylinder; An adjusting tube (15) is provided through the insertion hole. The adjusting tube (15) is formed by curling an elastic thin plate. When viewed in the X direction, the adjusting tube (15) is tubular. The adjusting tube (15) can expand outwards by its own elastic force, and the telescopic membrane (14) can adaptively deform as the adjusting tube (15) expands. Also included is a limiting component for limiting the outward expansion of the regulating tube (15), the limiting component comprising: The sleeve (16) is annular and sleeved on the cylinder, and the axis of the sleeve (16) coincides with the axis of the cylinder; A plurality of connecting plates (17) are located between the sleeve (16) and the cylinder and are used to fix the sleeve (16) and the cylinder. All the connecting plates (17) are arranged in a circular array along the axis of the sleeve (16); A plurality of connecting rod assemblies are arranged on corresponding connecting plates (17); the connecting rod assemblies include: A through groove (111) is provided on the connecting plate (17) and passes through the connecting plate (17) along the X direction; The limiting rod (112) is inserted into the through groove (111). The limiting rod (112) is connected to the connecting plate (17) by means of an axis. The plane where the axis of the limiting rod (112) is located is parallel to the end surface of the cylinder. The B end of the limiting rod (112) is in contact with the outer wall of the regulating tube (15). The limiting rod (112) can limit the expansion of the regulating tube (15) by rotating. The cylinder is provided with a generating device (2) for generating a vortex ring at the end of the regulating tube (15).

2. The airflow generating device for experimental research according to claim 1, characterized in that: The sleeve (16) is rotatably connected to a rotating frame (18), the rotating frame (18) is annular, and the axis of the rotating frame (18) coincides with the axis of the sleeve (16); A mounting frame (113) is fixed on the outer wall of the cylinder; a driving motor (114) is provided on the mounting frame (113), a non-rotating shaft end of the driving motor (114) is fixed on the mounting frame (113), and the axis of the rotating shaft of the driving motor (114) is along the X direction; a driving gear (115) is fixed on the rotating shaft of the driving motor (114), and the axis of the driving gear (115) coincides with the axis of the rotating shaft of the driving motor (114); a rotating rack (116) is fixedly connected to the rotating frame (18), and the rotating rack (116) is in an arc shape. When viewed in the X direction, its center coincides with the center of the sleeve frame (16), and the driving gear (115) is meshed with the rotating rack (116); A first connecting rod (19) is provided on the rotating frame (18), one end of the first connecting rod (19) is rotatably connected to the rotating frame (18), the axis of the hinge shaft of this end of the first connecting rod (19) is along the X direction, and the other end is not connected to the sleeve frame (16) and the rotating frame (18); A second connecting rod (110) is rotatably connected to the sleeve (16). When viewed in the X direction, the second connecting rod (110) is L-shaped. One end of the first connecting rod (19) is rotatably connected to the sleeve (16), and the other end can abut against the A end of the limiting rod (112). The middle part of the second connecting rod (110) is rotatably connected to the other end of the first connecting rod (19), and the axis of the hinge shaft at the other end of the first connecting rod (19) is along the X direction.

3. The airflow generating device for experimental research according to claim 1, characterized in that: The cylinder body is composed of a cylinder piece 1 (11) and a cylinder piece 2 (12). The cylinder piece 1 (11) and the cylinder piece 2 (12) are similar in shape and both include a cylindrical cylinder seat. A plurality of cylinder blocks are fixed on the end surface of the cylinder seat without a bottom surface. The cylinder blocks are arranged in a circular array along the axis of the cylinder seat, and a clamping groove (13) is formed between two adjacent cylinder blocks. When the cylinder piece 1 (11) and the cylinder piece 2 (12) form the cylinder body, the cylinder block of the cylinder piece 1 (11) is located in the clamping groove (13) of the cylinder piece 2 (12), and the cylinder block of the cylinder piece 2 (12) is located in the clamping groove (13) of the cylinder piece 1 (11). Each slot (13) is bonded with an elastic film for sealing the slot (13); a through hole (118) is provided on the first cylinder (11); the sleeve (16) is fixed to the first cylinder (11) through a connecting plate (17); and the generating device (2) is provided on the second cylinder (12); A hydraulic telescopic rod (117) is provided on the outer wall of the first cylinder (11), the non-telescopic end of the hydraulic telescopic rod (117) is fixed on the outer wall of the first cylinder (11), the telescopic end of the hydraulic telescopic rod (117) is fixed on the outer wall of the second cylinder (12), and the axis of the hydraulic telescopic rod (117) is along the X direction.

4. The airflow generating device for experimental research according to claim 3, characterized in that: The generating device (2) comprises: A generating motor (21) has a non-rotating shaft end fixed on the outer bottom surface of the cylinder seat of the second cylinder (12), and the rotating shaft axis of the generating motor (21) is along the radial direction of the second cylinder (12); A driving gear (22) is fixed on the rotating shaft of the generating motor (21), and the axis of the driving gear (22) coincides with the rotating shaft of the generating motor (21); The generating rack (23) is provided on the bottom surface of the cylinder seat of the second cylinder member (12). A hole for the generating rack (23) to pass through is provided on the bottom surface of the cylinder seat of the second cylinder member (12). The generating rack (23) can move along the X direction. The generating rack (23) is meshed with the driving gear (22). One end of the generating rack (23) extends into the interior of the cylinder body. The push plate (24) is fixed to one end of the generating rack (23) located inside the cylinder, and the peripheral wall of the push plate (24) is in contact with the inner wall of the cylinder.

5. The airflow generating device for experimental research according to claim 3, characterized in that: The airflow generating device further comprises a base assembly (3), the base assembly (3) comprising: A base plate (31) is provided with a cavity therein and is placed on the ground; A control motor (32), wherein the non-rotating shaft end is fixed in the cavity, and the rotating shaft of the control motor (32) is arranged vertically and extends out of the cavity; The support frame (33) is fixed on the rotating shaft of the control motor (32) and can rotate as a whole with the rotating shaft of the control motor (32); The shell (34) is fixed on the support frame (33), and the shell (34) is fixedly connected to the sleeve frame (16).

6. The airflow generating device for experimental research according to claim 4, characterized in that: An anti-slip block (25) is fixed on the inner wall of the cylinder, and a spring is installed on the anti-slip block (25). The compression direction of the spring is along the X direction. The push plate (24) can compress the air inside the cylinder during the stroke, and can compress the spring together with the anti-slip block (25).

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