A teaching wind tunnel experiment device

Abstract

The utility model discloses a wind tunnel experimental device for teaching, including wind tunnel casing, the wind tunnel casing is connected by a plurality of middle portion has the wind tunnel section of passage, is installed in every wind tunnel section bottom one adjustable support, the adjustable support includes four vertical setting telescopic outrigger and place between two telescopic outrigger's horizontal direction adjusting support, telescopic outrigger upper end rotatable installation in corresponding wind tunnel section's lower end surface, can be after the rotation under the action of external force, present horizontal shape, and with wind tunnel section between through a clamping piece positioning, the left and right ends of horizontal direction adjusting support can detachable connection on telescopic outrigger, and can horizontal direction telescopic and positioning.

Description

Technical Field

[0001] This utility model relates to a wind tunnel experimental device for teaching, specifically a test wind tunnel with adjustable outriggers. Background Technology

[0002] A wind tunnel is an experimental device used to simulate the motion of objects in the air. It artificially generates controllable airflow to study the interaction between the wind tunnel and the object, and is widely used in aerospace, automotive, construction, and sports fields. Due to the special nature of wind tunnel experimental devices used in teaching, their position and height need to be moved and adjusted during practical applications. This mainly includes the following situations: 1. During wind tunnel experiments, raising and lowering the wind tunnel body aligns the centerline of the experimental section with the centerline of the model to obtain optimal airflow characteristics; 2. During installation, if the ground at the installation location is uneven, and for accurate experimental results, it is necessary to ensure that the installation height of the left and right sides of the wind tunnel body is consistent. In this case, it is necessary to extend the support legs with recesses to ensure that the wind tunnel body maintains a consistent installation height after fixing; 3. After long-term use, the wind tunnel may tilt under the impact of wind. If the tilt angle is large, it will affect the experimental results. In this case, it is also necessary to adjust the support legs to reduce systematic errors caused by the wind tunnel tilt. 4. During teaching demonstrations, it is necessary to showcase the experimental results reflected by the wind tunnel under different conditions to provide research in multiple laboratory environments. Therefore, the installation height of the wind tunnel needs to be adjusted to adapt to different teaching demonstration conditions. 5. When conducting icing experiments, the wind tunnel system needs to be moved to a low-temperature environment. Furthermore, traditional teaching wind tunnel experimental devices are nearly 3 meters long, with a wind tunnel opening no smaller than 0.5 x 0.5 meters, and a maximum wind speed ≥ 15 m / s. Therefore, high requirements are placed on the overall mobility and stability of the teaching wind tunnel experimental device. Existing supports are usually cylindrical, square, airfoil-shaped, or vehicle-shaped supports at the bottom of each section, and are all fixed structures, making it difficult to meet the needs of height adjustment and retraction, causing many inconveniences in actual teaching.

[0003] Therefore, how to provide a wind tunnel experimental device for teaching that meets the requirements of portability and stability is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the existing technology, the purpose of this utility model is to provide a wind tunnel experimental device for teaching, which solves the problem that the existing technology cannot meet the needs of height adjustment and folding movement position.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A wind tunnel experimental device for teaching purposes includes a wind tunnel shell, which is composed of multiple wind tunnel sections with flow channels in the middle connected together. The device is characterized by having an adjustable support installed at the bottom of each wind tunnel section. Each adjustable support includes four vertically arranged telescopic legs and four horizontally adjusting rods positioned between two adjacent telescopic legs. The upper ends of the telescopic legs are rotatably mounted on the lower end face of the corresponding wind tunnel section, and can rotate to a horizontal position under external force, and are positioned with the wind tunnel section by a clamping device. The left and right ends of the horizontally adjusting rods are detachably connected to the telescopic legs and can extend and retract horizontally for positioning. Thus, an adjustable support is provided at the bottom of each wind tunnel section, and each adjustable support individually supports its corresponding wind tunnel section. Simultaneously, the telescopic legs in the support can extend and retract, thereby adjusting their length. If the heights of the telescopic legs on the left and right sides of the same wind tunnel section are different, the installation angle of the wind tunnel can be adjusted. Furthermore, by simultaneously adjusting each telescopic leg, the installation height can also be adjusted. The clamping devices installed on each wind tunnel section can cooperate with the clamping devices after the telescopic outriggers rotate to fold and fix the telescopic outriggers, making them more convenient to transport and taking up less space.

[0007] Furthermore, the lateral adjustment support rod includes an assembly cylinder and crossbars sleeved at both ends of the assembly cylinder. Both crossbars can move and be positioned along the length of the assembly cylinder. A clamp is rotatably installed at the outer end of each crossbar. The lateral adjustment support rod is fixedly connected to the telescopic outrigger via the clamps. The clamps can rotate with the telescopic outrigger when the crossbar moves horizontally, and after rotating a certain angle, they are locked and positioned at the end of the crossbar by a locking mechanism. Thus, during adjustment, the two crossbars are first moved to the appropriate position and positioned, and then connected and fixed to the corresponding telescopic outrigger via the clamps. This adjustment and fixing method is relatively flexible. When the two crossbars move outward, their outer end positions change, thereby changing the overall length of the lateral adjustment support rod, causing the connected telescopic outrigger to tilt, and the height of the telescopic outrigger changes accordingly, thus achieving adjustment and change of the support height. Because the clamp and crossbar are rotatably connected, when the telescopic outrigger is pushed and rotates, the clamp also rotates with the outrigger to adapt to its angle. After rotating to the correct position, the clamp is locked to the end of the crossbar by a locking mechanism, effectively ensuring a stable connection between the telescopic outrigger and the crossbar after rotation. This adjustment method allows for fine-tuning of each wind tunnel section after installation (i.e., controlling the telescopic outrigger from a vertical angle to an inclined state within 1-8°), and the adjustment speed is fast. Furthermore, the connection between the lateral adjustment rod and the telescopic outrigger increases the structural strength of the support structure, making it more stable.

[0008] Furthermore, the assembly cylinder has two internal threads spaced apart inside, with opposite thread directions. The inner ends of the two crossbars are threaded into the assembly cylinder. In this way, during use, the two crossbars can be adjusted directly by rotating the assembly cylinder, ensuring that the adjustment lengths on both sides are consistent, thus guaranteeing that the tilt angles of the telescopic outriggers on both sides are consistent. Simultaneously, the angle of one telescopic outrigger can also be adjusted by rotating one of the crossbars individually. This adjustment method is flexible, and the structure is also relatively stable.

[0009] Furthermore, the clamp includes a fixed clamp plate and a movable clamp plate, both of which are arc-shaped. One end of the movable clamp plate is rotatably connected to the rotating end of the fixed clamp plate, and the other end is tightly attached to the connecting end of the fixed clamp plate, forming a tightening space that cooperates with the telescopic outrigger. The outer end of the crossbar has a rectangular block, and two connecting lugs are fixed on the fixed clamp plate near the crossbar. The fixed clamp plate is rotatably connected to the rectangular block after passing through the connecting lugs and the rectangular block via a rotating shaft. The end of the rotating shaft is provided with an external thread to form a locking thread section, and a locking nut that engages with the thread is fitted on the locking thread section. When there is a gap between the locking nut and the adjacent connecting lug, the rotating shaft is in an unlocked state; when the locking nut is tightly attached to the adjacent connecting lug, the rotating shaft is in a locked state. In this way, one side of the clamp is fixed to the crossbar, ensuring the clamp's position. When connecting to the telescopic outrigger, simply rotate the movable clamp plate to connect the ends of the fixed clamp plate and the movable clamp plate, thus securing it to the telescopic outrigger. Two interlocking lugs on the outer end face of the fixed clamp plate can engage with the rectangular block and are rotatably connected to the rectangular block via a pivot. As the crossbar extends, the clamp is pushed and rotates to match the rotation angle of the telescopic outrigger. After rotation, rotating the locking nut moves it towards the center of the pivot, tightly fixing the two interlocking lugs to the rectangular block and locking the fixed clamp plate to the crossbar. This method of locking and unlocking the pivot is simple to operate and structurally stable.

[0010] Furthermore, a rubber layer is provided on the inner wall of the grooves of both the fixed and movable clamp plates, and anti-slip stripes are provided on the rubber layer. In this way, the rubber layer can increase the friction between the clamp and the telescopic outrigger, and has a certain degree of deformation, which can ensure the clamp's tightening force.

[0011] Furthermore, at least one connecting rod is provided between two adjacent supports, and the connecting rod has the same structure as the lateral adjusting support rod. In this way, the connection between two adjacent supports via the connecting rod can further increase the supporting force on the wind tunnel shell.

[0012] Furthermore, the clamping component consists of two spaced-apart clamping plates, forming a clamping space for the telescopic outrigger between the two plates. This design simplifies the clamping component's structure and allows for quick and easy clamping and securing of the telescopic outrigger.

[0013] Furthermore, the wind tunnel section comprises five sections: an inlet section, a diffuser section, a stabilization section, a contraction section, and a test section. A fan speed controller is installed in the inlet section, and a transparent observation window is installed in the stabilization section. Thus, the fan speed controller in the inlet section controls the airflow speed entering the wind tunnel, and the observation window facilitates the observation and recording of the airflow conditions.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. This utility model is ingeniously conceived and rationally designed, effectively solving the need for adjusting the installation height and angle of the support legs during teaching and experiments. It offers convenient height adjustment and good stability. Specifically, each wind tunnel section is equipped with an adjustable bracket, with each set of brackets individually supporting its corresponding section. Simultaneously, the telescopic support legs within the adjustable brackets can extend and retract, allowing for independent length adjustment during installation. If the heights of the telescopic support legs on the left and right sides of the same wind tunnel section differ, the installation angle of the wind tunnel can be adjusted. Simultaneous adjustment of each telescopic support leg also allows for adjustment of the overall installation height of the wind tunnel.

[0016] 2. The outriggers of this invention are easy to fold and retract, occupy little space, and are convenient for handling and transportation. When handling is required for icing experiments, the telescopic outriggers are first retracted, then rotated to the bottom of the wind tunnel shell for positioning and transport, making handling convenient and minimizing space requirements. The clamping mechanism on the wind tunnel section can engage with the telescopic outriggers after rotation, allowing the outriggers to be folded and secured, offering convenience and flexibility.

[0017] 3. In this utility model, both the fixed hoop and the movable hoop are arc-shaped. One end of the movable hoop is rotatably connected to the rotating end of the fixed hoop, and the other end is tightly fitted to the connecting end of the fixed hoop, forming a tightening space that cooperates with the telescopic outrigger. In this way, one side of the clamp is fixed to the crossbar, ensuring the clamp's position. When connecting to the telescopic outrigger, simply rotate the movable hoop to connect the ends of the fixed hoop and the movable hoop to achieve fixation with the telescopic outrigger. This method of locking and unlocking the shaft is simple to operate and structurally stable. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the wind tunnel in the embodiment;

[0019] Figure 2 This is a schematic diagram of the retractable outriggers in the wind tunnel of the steady flow section in the embodiment, showing their folded state.

[0020] Figure 3 This is a schematic diagram of the elevation structure of the wind tunnel in the steady flow section of the embodiment;

[0021] Figure 4 This is an enlarged top view of the lateral adjustment strut in the embodiment;

[0022] Figure 5 This is a side view of the crossbar in the embodiment. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0024] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] like Figure 1 As shown, a typical wind tunnel experimental setup for teaching purposes includes the following components: Inlet section 11: reduces airflow disturbance and improves flow field uniformity; Diffusion section 12: reduces airflow velocity and energy loss; Stabilization section 13: increases airflow velocity; Contraction section: connects the stabilization section and the test section, with a gradually decreasing cross-sectional area. Airflow velocity increases as it passes through the contraction section, improving airflow uniformity and directionality; Test section 15: holds the model for measurement and observation; Drive system: such as a fan or shock tube, generating airflow; Measurement and control system: measures parameters such as wind speed, pressure, lift, and drag; and support bases for fixing the inlet section 11, diffusion section 12, stabilization section 13, contraction section 14, and test section 15. The installation of the wind tunnel is based on the principle of relative motion: the model remains stationary while the wind moves, simulating the effect of an object moving in the air.

[0026] To address the need for convenient relocation and height adjustment of wind tunnel experimental devices used in teaching, and to adapt to different terrains where the height of the outriggers needs to be adjusted in real time, and also to demonstrate the experimental results under different conditions during wind tunnel experiments or teaching demonstrations, the height or angle of the outriggers in the wind tunnel section needs to be adjusted. Therefore, this utility model provides a wind tunnel experimental device for teaching.

[0027] Example:

[0028] See Figure 1 and Figure 2 This embodiment provides a wind tunnel experimental device for teaching, including a wind tunnel shell 1. The wind tunnel shell 1 is composed of multiple wind tunnel sections with flow channels in the middle, which are detachably connected (the wind tunnel sections are five in number: an inlet section 11, a diffuser section 12, a flow stabilizing section 13, a contraction section 14, and a test section 15). An adjustable support is installed at the bottom of each wind tunnel section. The adjustable support includes four vertically arranged telescopic legs 2 and four horizontally adjusting rods 3 placed between two adjacent telescopic legs 2. The upper end of each telescopic leg 2 is rotatably mounted on the lower end face of the corresponding wind tunnel section, and can be rotated under external force to achieve a horizontal position, and is positioned with the wind tunnel section by a clamping member 4. The left and right ends of the horizontally adjusting rods 3 are detachably connected to the telescopic legs 2 and can extend and retract horizontally for positioning. Thus, each wind tunnel section is provided with an adjustable support, and each set of supports individually supports the corresponding wind tunnel section. Meanwhile, the telescopic support legs 2 in the adjustable bracket can extend and retract, allowing for length adjustment during installation. If the heights of the telescopic support legs 2 on the left and right sides of the same wind tunnel section are different, the installation angle of the wind tunnel can be adjusted. Simultaneous adjustment of each telescopic support leg 2 also allows for adjustment of the overall installation height of the wind tunnel. This adjustment method effectively meets the needs for adjusting the installation height and angle of the support legs during teaching and experiments, and the overall operation is simple and convenient, with a relatively stable adjustment structure. The clamping parts 4 installed on each wind tunnel section can engage with the telescopic support legs 2 after rotation, folding and fixing them in place. Therefore, when transporting the support legs for icing experiments, they can be retracted first, then rotated to the bottom of the wind tunnel shell for positioning and transport, making transport more convenient and requiring less space.

[0029] like Figure 2 As shown, the clamping component 4 consists of two spaced-apart clamping plates 41, forming a clamping space 42 for the telescopic outrigger 2 between the two clamping plates 41. Thus, the clamping component 4 has a simple structure and can quickly clamp and fix the telescopic outrigger 2.

[0030] See Figure 3The lateral adjustment support rod 3 comprises an assembly cylinder 31 and crossbars 32 sleeved at both ends of the assembly cylinder 31. Both crossbars 32 can move and be positioned along the length of the assembly cylinder 31. A clamp 33 is rotatably installed at the outer end of each crossbar 32. The lateral adjustment support rod 3 is fixedly connected to the telescopic support leg 2 via the clamps 33. The clamps rotate with the telescopic support leg 2 as the crossbar moves horizontally, and after rotating a certain angle, are locked and positioned at the end of the crossbar via a locking mechanism. Thus, during adjustment, the two crossbars 32 are first moved to the appropriate position and positioned, and then fixed to the corresponding telescopic support leg 2 via the clamps 33. This adjustment and fixing method is flexible. When the two crossbars 32 move outward, their outer end positions change, thereby changing the overall length of the lateral adjustment support rod, causing the connected telescopic support leg 2 to tilt, and thus changing the height of the telescopic support leg 2, thereby achieving adjustment of the support height. Because the clamp 33 and the crossbar 32 are rotatably connected, when the telescopic outrigger 2 is pushed and rotates, the clamp will also rotate with the telescopic outrigger 2 to adapt to its angle. After rotating to the correct position, the clamp is locked to the end of the crossbar by a locking mechanism, effectively ensuring a stable connection between the telescopic outrigger and the crossbar after rotation. This adjustment method allows for fine-tuning of each wind tunnel section after installation (i.e., controlling the telescopic outrigger from a vertical angle to an inclined state within 1-8°), and the adjustment speed is fast. Simultaneously, the connection between the lateral adjustment rod and the telescopic outrigger also increases the structural strength of the support structure, making it more stable.

[0031] See Figure 4 The assembly cylinder 31 has two internal threads spaced apart inside, with opposite thread directions. The inner ends of the two crossbars 32 are threadedly connected to the assembly cylinder 31. Thus, during use, the two crossbars 32 can be adjusted directly by rotating the assembly cylinder 31, ensuring that the adjustment lengths on both sides are consistent, thereby guaranteeing that the tilt angles of the telescopic outriggers 2 on both sides are consistent. Simultaneously, the angle of one side of the telescopic outrigger 2 can also be adjusted by rotating one of the crossbars 32 individually. This adjustment method is flexible, and the structure is relatively stable.

[0032] The clamp 33 includes a fixed clamp plate 331 and a movable clamp plate 332. Both the fixed clamp plate 331 and the movable clamp plate 332 are arc-shaped. One end of the movable clamp plate 332 is rotatably connected to the rotating end of the fixed clamp plate 331, and the other end is tightly attached to the connecting end of the fixed clamp plate 331, forming a tight-fitting space 333 that cooperates with the telescopic outrigger 2. The connecting ends of the fixed clamp plate 331 and the movable clamp plate 332 are bent outward and then fixed by fasteners. The crossbar 32 has a rectangular block 321 at its outer end. Two connecting lugs are fixed to the rectangular block at the end of the fixed clamp plate 331 near the crossbar. The fixed clamp plate 331 is rotatably connected to the rectangular block 321 by a rotating shaft 34 passing through the connecting lugs and the rectangular block 321. The rotating shaft 34 is a screw with external threads at its end. One end of the external thread forms a locking thread section, and a locking nut 35 is fitted on the locking thread section to engage with its threads. When there is a gap between the locking nut 35 and the adjacent connecting lug, the rotating shaft is in an unlocked state. When the locking nut is close to the adjacent connecting lug, the rotating shaft is in a locked state. One side of the clamp is fixed to the crossbar 32, thereby ensuring the position of the clamp 33. When connected to the telescopic outrigger 2, it is only necessary to rotate the movable clamp plate 332 to connect the ends of the fixed clamp plate 331 and the movable clamp plate 332 to achieve fixation with the telescopic outrigger. Two interlocking lugs on the outer end face of the fixed hoop plate can be engaged with the rectangular block and are rotatably connected to the rectangular block 321 via a pivot. During the extension of the crossbar, the hoop is pushed and rotates to match the rotation angle of the telescopic outrigger. After rotation, the locking nut 35 is rotated, moving it towards the center of the pivot, thus securing the two interlocking lugs tightly to the rectangular block and locking the fixed hoop plate to the crossbar. This method of locking and unlocking the pivot is simple to operate and provides a stable structure.

[0033] like Figure 5 As shown, in this embodiment, the crossbar end faces on both sides of the rectangular block 321 are arc-shaped, which facilitates the movement of the connecting lugs during rotation. Correspondingly, the end of the connecting lug closest to the arc-shaped surface is also arc-shaped. At the same time, the thickness of the connecting lug gradually decreases at the end closest to the arc-shaped surface. When the locking nut 35 rotates and moves towards the center of the shaft, it will press together with the nut at the other end of the shaft to compress the two connecting lugs. Under the pressure of the nut and locking nut 35, the connecting lugs will be pressed towards the rectangular block 321 and tightly fixed to the side of the rectangular block 321.

[0034] Furthermore, a rubber layer is provided on the inner wall of the grooves of both the fixed hoop 331 and the movable hoop 332, and anti-slip stripes are provided on the rubber layer. In this way, the rubber layer can increase the friction between the clamp 33 and the telescopic outrigger 2, and has a certain degree of deformation, which can ensure the fastening force of the clamp 33.

[0035] Furthermore, at least one connecting rod is provided between two adjacent supports, and the connecting rod has the same structure as the lateral adjusting support rod 3. In this way, the connection between two adjacent supports through the connecting rod can further increase the supporting force on the wind tunnel shell 1.

[0036] Specifically, the telescopic and positioning structure of the telescopic outrigger 2 in this embodiment is existing technology. A horizontally positioned sleeve is provided at the upper end of the telescopic outrigger 2, which is secured within the clamping space 42. A sleeve rod is provided between two clamping plates and fitted inside the sleeve. Under external force, the sleeve on the telescopic outrigger 2 can rotate around the sleeve rod. When the telescopic outrigger 2 rotates to a certain angle, a positioning pin can pass through the sleeve and the sleeve rod to position the sleeve. In practice, a fixed base can also be detachably installed at the lower end of the telescopic outrigger 2, and the fixed base is locked to the ground by fasteners.

[0037] Furthermore, a fan speed controller is installed in the inlet section, and a transparent observation window is installed in the stabilization section. In this way, the fan speed controller in the inlet section can control the airflow speed entering the wind tunnel, and the observation window facilitates the observation and recording of airflow conditions.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of this utility model that do not depart from the spirit and scope of this technical solution should be covered within the scope of the claims of this utility model.

Claims

1. A wind tunnel experimental apparatus for teaching purposes, comprising a wind tunnel shell, said wind tunnel shell being composed of multiple wind tunnel sections with flow channels in the middle connected together; characterized in that, An adjustable bracket is installed at the bottom of each wind tunnel section. The adjustable bracket includes four vertically arranged telescopic legs and four horizontally adjusting support rods placed between two adjacent telescopic legs. The upper end of each telescopic leg is rotatably mounted on the lower end face of the corresponding wind tunnel section. It can rotate to a horizontal position under the action of external force and is positioned with the wind tunnel section by a clamping device. The left and right ends of each horizontally adjusting support rod are detachably connected to the telescopic legs and can extend and retract horizontally and be positioned.

2. The wind tunnel experimental apparatus for teaching purposes according to claim 1, characterized in that, The lateral adjustment support rod includes an assembly cylinder and crossbars sleeved at both ends of the assembly cylinder. Both crossbars can move and be positioned along the length of the assembly cylinder. A clamp is rotatably installed at the outer end of each crossbar. The lateral adjustment support rod is fixedly connected to the telescopic outrigger through the clamp. The clamp can rotate with the telescopic outrigger when the crossbar moves horizontally, and after rotating a certain angle, it is locked and positioned at the end of the crossbar through a locking mechanism.

3. The wind tunnel experimental apparatus for teaching purposes according to claim 2, characterized in that, The assembly cylinder has two internal threads spaced apart inside, with the threads of the two internal threads having opposite directions, and the inner ends of the two crossbars are threadedly connected to the assembly cylinder.

4. The wind tunnel experimental apparatus for teaching purposes according to claim 2, characterized in that, The clamp includes a fixed clamp plate and a movable clamp plate, both of which are arc-shaped. One end of the movable clamp plate is rotatably connected to the rotating end of the fixed clamp plate, and the other end is tightly attached to the connecting end of the fixed clamp plate, forming a tightening space that cooperates with the telescopic outrigger. The outer end of the crossbar has a rectangular block, and two connecting lugs are fixed on the fixed clamp plate near the crossbar. The fixed clamp plate is rotatably connected to the rectangular block after passing through the connecting lugs and the rectangular block via a rotating shaft. The end of the rotating shaft is provided with an external thread to form a locking thread section, and a locking nut that engages with the thread is fitted on the locking thread section. When there is a gap between the locking nut and the adjacent connecting lug, the rotating shaft is in an unlocked state; when the locking nut is tightly attached to the adjacent connecting lug, the rotating shaft is in a locked state.

5. The wind tunnel experimental apparatus for teaching purposes according to claim 4, characterized in that, Both the fixed hoop and the movable hoop have rubber layers on their inner walls, and anti-slip stripes are provided on the rubber layers.

6. The wind tunnel experimental apparatus for teaching purposes according to claim 1, 2, 3, or 4, characterized in that, At least one connecting rod is provided between two adjacent supports, and the connecting rod has the same structure as the lateral adjustment support rod.

7. The wind tunnel experimental apparatus for teaching purposes according to claim 6, characterized in that, The clamping component consists of two spaced-apart clamping plates, with a clamping space for a telescopic support leg formed between the two plates.

8. The wind tunnel experimental apparatus for teaching purposes according to any one of claims 1, 2, 3, 4, or 5, characterized in that, The wind tunnel section consists of five parts: an inlet section, a diffuser section, a flow stabilization section, a contraction section, and a test section. A fan speed controller is installed in the inlet section, and a transparent observation window is installed in the flow stabilization section.

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