A wind tunnel experiment device
By using a fan matrix and wireless communication technology, the structure of the wind tunnel model is simplified, and airflow uniformity and intelligent measurement are achieved. This solves the problems of complexity and lack of intelligence in existing wind tunnel models and provides portability and quantitative measurement capabilities.
Patent Information
- Application Number
- CN202521664720.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Filing Date
- 2025-08-06
- Publication Date
- 2026-07-14
- Estimated Expiration
- 2035-08-06
Smart Images
Figure CN224499886U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of wind tunnel technology, and in particular relates to a wind tunnel experimental device. Background Technology
[0002] In aerospace technology teaching practice, wind tunnels are an effective teaching experimental tool that can visually demonstrate the behavior of aircraft in high-speed airflow. Students can learn through this equipment how aircraft take off and how they achieve attitude control, demystifying aerospace technology. However, wind tunnels are highly technical and expensive research equipment, difficult for most schools to obtain, and their large size makes them difficult to move.
[0003] To meet teaching needs, some wind tunnel models are currently available for educational purposes. A typical wind tunnel model in existing technology generally consists of a powered fan, a diffuser, a rectifier, a wind gatherer, a tracer smoke generator, and an experimental area connected in series. The powered fan is often a single fan, and the airflow from a single fan is disordered. Therefore, the diffuser and rectifier need to organize the disordered airflow into a stable airflow with a consistent vector direction. Specifically, the diffuser disperses the various disordered airflows generated by the powered fan, initially straightening the airflow vector; the rectifier organizes the disordered airflow into a stable airflow with a consistent vector direction; subsequently, the wind gatherer compresses the airflow generated in the rectifier to increase wind speed; the tracer smoke generator produces tracer smoke, allowing users to observe the airflow direction based on the trajectory of the tracer smoke when the airflow from the wind gatherer passes through it; the experimental area is used to place experimental samples for experiments, such as a wing model, to demonstrate the principle of lift generation during flight. However, this type of wind tunnel model also has the disadvantage of a relatively complex structure, which makes it inconvenient to move and disassemble the wind tunnel model; at the same time, it is not intelligent enough, for example, it can only qualitatively demonstrate the principle of the lift generated by the wing during flight, but it is difficult to make quantitative measurements, and the angle of attack of the wing needs to be manually adjusted, etc. Utility Model Content
[0004] To address the problems of complex and insufficiently intelligent wind tunnel models in existing technologies, the purpose of this invention is to provide a wind tunnel experimental device to solve these problems.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a wind tunnel experimental device, comprising a powered fan, an experimental zone, a rectification zone, a transparent square tube, and a tracer smoke generator. The transparent square tube has a hollow structure, with the powered fan installed on one side and the rectification zone installed on the other side. The powered fan is a fan matrix, and the powered fan draws air from one side of the rectification zone to the other side. The experimental zone is located between the powered fan and the rectification zone. The tracer smoke generator is located outside the transparent square tube and connected to the rectification zone. The rectification zone is a pipe matrix composed of pipes.
[0006] Using multiple low-power fans connected in parallel to form a matrix instead of a single high-power fan produces a more stable airflow field with a superior flow field vector compared to a single fan. Furthermore, by designing the rectification zone at the air inlet of the entire wind tunnel and placing the power fan at the rear, the flow field generated by the exhaust method is significantly more uniform than that generated by the blowing method. Thanks to the relatively consistent airflow vector direction generated by the fan matrix, this invention can merge the diffusion zone, rectification zone, air collection zone, and experimental zone of a traditional wind tunnel model into a single transparent tube. This improvement provides ample simplification for wind tunnel design.
[0007] Since the rectifier is located at the air inlet of this wind tunnel device, the tracer smoke generator can be placed outside the transparent square tube. This design allows the tracer smoke device to be designed and selected independently without being affected by the main body of the wind tunnel.
[0008] Furthermore, the power fan and the transparent square tube are detachably connected, which not only makes it convenient for users to maintain or replace the fan, but also makes it convenient for users to take samples into and out of the experimental area, making it convenient for users to use.
[0009] Furthermore, the pipe is a PVC pipe.
[0010] Furthermore, the transparent square tube is made of acrylic, but other materials that can achieve a transparent effect, such as glass, are also acceptable.
[0011] Furthermore, the power fan is a 3×3 fan matrix.
[0012] Furthermore, the tracer smoke generator is equipped with at least one smoke generator and the same number of control circuit boards as the smoke generator. Each smoke generator is electrically connected to one control circuit board, which enables independent control between the smoke generators. The smoke generator is equipped with two smoke outlets.
[0013] Furthermore, it also includes a guide tube frame, a cap, and a Y-shaped guide tube; the upper surface of the transparent square tube near the opening of the rectification area is provided with a positioning hole, and the lower surface is provided with a positioning block at the position corresponding to the positioning hole; the guide tube frame is a hollow tube, one end of which is inserted into the positioning block, and the other end corresponds to the positioning hole; the cap is detachably connected to the guide tube frame through the positioning hole; the outer wall of the guide tube frame is provided with at least one first input hole and a second input hole corresponding to the position of the first input hole; the two ends of the branched side of the Y-shaped guide tube are detachably connected to two smoke outlets of the same smoke generator, and the unbranched side extends into a pipe in the rectification area through the first input hole and the corresponding second input hole.
[0014] How to place experimental samples in the experimental area for experimentation is a problem that needs to be solved. Therefore, this utility model also provides two different sample racks for use in the experimental area of this utility model: a lift demonstration sample rack and a lift measurement sample rack, to meet different usage needs. The lift demonstration sample rack can be used to visually demonstrate the lift generated by the airflow over the wing when airflow passes through the wind tunnel, thus causing the wing to rise; the lift measurement sample rack is used to measure the lift under different angles of attack of the wing, and it needs to have the ability to adjust the wing's angle of attack and measure lift. The structure of these two sample racks is described in detail below:
[0015] Furthermore, the experimental area is a demonstration sample rack for airborne operation, including a base, a tray, a tray seat, a first support, a second support, and a first connecting rod. The upper surface of the tray has a fixed angle of attack relative to the horizontal surface, and the lower surface of the tray has support rods at both ends pointing downwards. The front of the tray seat is "I"-shaped, with a first through hole on each of its upper two sides to accommodate the support rod, and a second through hole on each of its lower two sides to accommodate the support rod. A connecting structure is provided between the upper and lower ends, and the support rod passes through the first and second through holes and slides up and down within them. The upper center of the tray seat has a first connecting hole to accommodate the first connecting rod, and the lower center has a second connecting hole to accommodate the first connecting rod. The front of the first support is "V"-shaped, with its upper part located between the second support and the tray seat, and its lower two ends connected to the base. The second support is cuboid, with through holes on the upper part of the first support and the upper surface of both the second support to accommodate the first connecting rod. The first connecting rod is inserted into the first connecting hole, the second connecting hole, the through hole on the first support, and the through hole on the second support. The second support is connected to the base.
[0016] Furthermore, the experimental area is an aerial measurement sample frame, including a base, a servo motor, a servo motor frame, a crossbeam, a strain gauge connector, a strain gauge sensor, a second connecting rod, and a lower-level computer; the upper surface of the strain gauge sensor is connected to the bottom surface of the strain gauge connector, and the lower surface is connected to the base; the upper part of the strain gauge connector is columnar, and the lower part is plate-like, with a rod-like connecting structure between them; the upper part of the servo motor frame is cuboid, and the lower part is columnar; the upper part of the strain gauge connector and the lower part of the servo motor frame are provided with grooves that can accommodate the second connecting rod, and the upper end of the second connecting rod is connected to the lower part of the servo motor frame. The lower end of the servo motor is inserted into the groove of the strain gauge connector. The servo motor frame is used to fix the servo motor. The upper part of the servo motor frame is provided with a slot through which the servo motor's rotation shaft can pass. After the servo motor's rotation shaft extends into the slot, it connects to the servo motor connecting slot provided in the middle of one side of the crossarm. The other side of the crossarm is connected to one side of the wing. The servo motor is used to adjust the angle of attack of the wing. It is connected to the servo motor frame through the strain gauge connector and the second connecting rod. The lift is transmitted from the wing to the servo motor frame and then further transmitted to the strain gauge sensor. The servo motor and the strain gauge sensor are connected to the lower electromechanical unit.
[0017] Furthermore, the elevated measurement sample holder also includes a host computer outside the transparent square tube, and the slave computer includes a force sensor processing module, a wind speed sensor processing module, a microcontroller processing module, and a wireless communication module; the host computer includes a microcontroller processing module, a wireless communication module, and a touch screen module; the touch screen module is used to realize data display and command input functions; the host computer and the slave computer are connected wirelessly; the wireless communication connection method is one of 2.4GHz wireless connection, 5GHz wireless connection, cellular network, and Bluetooth connection, but is not limited to these.
[0018] Of course, the experimental area of this invention may not require the installation of the aforementioned sample rack. Users can find a sample rack that meets their needs and matches the experimental area from existing technologies, or design their own according to requirements. To make the sample rack more stable, the base is suitable for use with a high-density material to lower the center of gravity of the sample rack and maintain stability. Structures related to fixing the transparent square tube can also be added to the base.
[0019] Furthermore, the first connecting rod 213 and the second connecting rod 223 are made of acrylic, but other materials that can achieve a transparent effect, such as glass, are also acceptable.
[0020] The beneficial effects of this utility model are:
[0021] 1. The diffusion zone, rectification zone, wind collection zone and experimental zone in the traditional wind tunnel model are integrated into a transparent square tube, which is simple in structure, reduces volume, and is easy to carry and disassemble.
[0022] 2. Replace the single high-power fan in the traditional wind tunnel model with a fan matrix composed of several low-power fans, which can provide a more uniform airflow field compared to a single fan;
[0023] 3. The power fan is placed at the rear of the device, and the airflow is generated by exhaust. The resulting airflow is more uniform than that generated by the blowing method in the existing wind tunnel model.
[0024] 4. Placing the rectification area at the very front of the wind tunnel simplifies its structure. With the rectification area at the front, the tracer smoke generator can also be placed outside the transparent square tube, allowing the tracer smoke generator to be easily and independently disassembled and installed, further simplifying the wind tunnel structure.
[0025] 5. The fan assembly is designed to be openable and closable. The experimental samples are placed and retrieved by opening and closing the fan assembly, eliminating the traditional wind tunnel model experimental area's hatch for placing and retrieving samples. This effectively simplifies the wind tunnel structure and improves the airtightness of the device.
[0026] 6. The second embodiment of this utility model designs and manufactures a wireless control, data acquisition, and result display circuit based on wireless communication, making this utility model more intelligent than the traditional wind tunnel model, and enabling functions such as quantitative measurement of experimental data and controllable change of wing angle of attack. Attached Figure Description
[0027] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:
[0028] Figure 1 This is a schematic diagram of the overall structure of a wind tunnel experimental device according to the present invention.
[0029] Figure 2 This is a right view of the wind tunnel experimental device of this utility model in use (the tracer smoke generator is omitted).
[0030] Figure 3 This is a schematic diagram of the tracer smoke generator structure of a wind tunnel experimental device according to this utility model.
[0031] Figure 4 This is a partial cross-sectional structural diagram of a wind tunnel experimental device according to the present invention in its operational state.
[0032] Figure 5 This is a schematic diagram of the sample frame for the airborne demonstration of a wind tunnel experimental device according to this utility model.
[0033] Figure 6 This is a schematic diagram of the lift measurement sample holder structure of a wind tunnel experimental device according to this utility model.
[0034] Figure 7This is a schematic diagram of the crossbar structure in the lift measurement sample holder.
[0035] Figure 8 This is a circuit structure block diagram of the host computer and slave computer in the lift measurement sample holder.
[0036] In the diagram: 1. Powered fan; 2. Experimental area; 3. Rectification area; 4. Transparent square tube; 5. Tracer smoke generator; 31. Pipe; 41. Positioning hole; 42. Positioning block; 51. Smoke generator; 52. Control circuit board; 511. Smoke outlet; 53. Conduit frame; 531. First input hole; 532. Second input hole; 54. Cover; 55. Y-shaped conduit; 20. Base; 21. Elevated demonstration sample rack; 211. Tray; 212. Tray base; 214. First support Frame; 215, Second bracket; 213, First connecting rod; 2111, Support rod; 2121, First through hole; 2122, Second through hole; 2123, First connecting hole; 2124, Second connecting hole; 22, Lifting measurement sample frame; 220, Lower computer; 221, Strain gauge sensor; 222, Strain gauge connector; 223, Second connecting rod; 224, Servo frame; 2241, Slot; 225, Servo; 226, Crossbeam; 2261, Servo connecting slot. Detailed Implementation
[0037] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.
[0038] Example 1
[0039] Please see Figure 1 This embodiment provides a wind tunnel experimental apparatus, including a powered fan 1, an experimental zone 2, a rectification zone 3, a transparent square tube 4, and a tracer smoke generator 5. The transparent square tube 4 has a hollow structure, with the powered fan 1 installed on one side and the rectification zone 3 installed on the other side. The powered fan 1 is a 3×3 fan matrix, and the powered fan 1 draws air from one side of the rectification zone 3 to the other side. The experimental zone 2 is located between the powered fan 1 and the rectification zone 3. The tracer smoke generator 5 is located outside the transparent square tube 4 and connected to the rectification zone 3. The rectification zone 3 is a pipe matrix composed of pipes 31. In this embodiment, the pipes 31 are PVC pipes; the transparent square tube 4 is a 360×360×800mm hollow square tube made of 5mm thick acrylic sheets bonded together.
[0040] In this embodiment, the nine fans selected for the 3×3 fan matrix are all the same exhaust fans, and the parameters of a single exhaust fan are as follows: size 120×120×38mm, rated voltage 12V, rated current 1.6A, rated power 19.2W, speed 600 r / min, and air volume 240CFM.
[0041] Please see Figure 3 The tracer smoke generator 5 is equipped with at least one smoke generator 51 and the same number of control circuit boards 52 as the smoke generators 51. Each smoke generator 51 is electrically connected to one control circuit board 52, thus enabling independent control of the smoke generators 51. In this embodiment, the smoke generator 51 uses an engine smoke generator from a tank model, branded "Huaweilong". This engine smoke generator consists of a fuel tank and a blower. The top of the fuel tank has two smoke outlets 511, which also serve as fuel inlets. The fuel tank is filled with smoke-generating oil. A heating wire is installed inside the fuel tank to heat the smoke-generating oil and produce smoke. In this embodiment, four tracer smoke belts are required, therefore four smoke generators 51 and four control circuit boards 52 are provided. Each control circuit board 52 controls the operating status of one smoke generator 51.
[0042] Please see Figure 2 , Figure 4 In its working state, this utility model also includes a guide tube frame 53, a cover 54, and a Y-shaped guide tube 55; the upper surface of the transparent square tube 4 near the opening of the rectifier zone 3 is provided with a positioning hole 41, and the lower surface is provided with a positioning block 42 at the position corresponding to the positioning hole 41; the guide tube frame 53 is a hollow tube, one end of which is inserted into the positioning block 42, and the other end corresponds to the positioning hole 41; the cover 54 is detachably connected to the guide tube frame 53 through the positioning hole 41; the outer wall of the guide tube frame 53 is provided with at least one first input hole 531 and a second input hole 532 corresponding to the position of the first input hole 531; the two ends of the branched side of the Y-shaped guide tube 55 are detachably connected to the two smoke outlets 511 of the same smoke generator 51, and the unbranched side extends into a pipe 31 in the rectifier zone 3 after passing through the first input hole 531 and the corresponding second input hole 532.
[0043] Please see Figure 5, this embodiment is used to demonstrate the phenomenon of the wing rising when the airflow in the wind tunnel flows through the wing. Therefore, in this embodiment, the experimental area 2 is the liftoff demonstration sample rack 21, including a base 20, a tray 211, a tray seat 212, a first bracket 214, a second bracket 215 and a first connecting rod 213; the upper surface of the tray 211 has a fixed angle of attack relative to the horizontal plane, and two support rods 2111 are respectively provided downward at both ends of the lower surface of the tray 211; the front of the tray seat 212 is in the shape of a "work" character, and a first through hole 2121 capable of accommodating the support rod 2111 is provided on each side of the upper end, and a second through hole 2122 capable of accommodating the support rod 2111 is provided on each side of the lower end. A connecting structure is provided between the upper end and the lower end, and the support rod 2111 passes through the first through hole 2121 and the second through hole 2122 and slides up and down therein; a first connection hole 2123 capable of accommodating the first connecting rod 213 is provided in the center of the upper end of the tray seat 212, and a second connection hole 2124 capable of accommodating the first connecting rod 213 is provided in the center of the lower end; the front of the first bracket 214 is in the shape of a "Ji" character, and its upper part is located between the second bracket 215 and the tray seat 212, and its lower part is respectively connected to the base 20, which is a threaded connection in this embodiment; the second bracket 215 is in the shape of a cuboid, and through holes capable of accommodating the first connecting rod 213 are provided on the upper surface of the upper part of the first bracket 214 and the second bracket 215. The first connecting rod 213 is inserted into the first connection hole 2123, the second connection hole 2124, the through hole on the first bracket 214 and the through hole on the second bracket 215, and the second bracket 215 is connected to the base 20. The materials of the first connecting rod 213 and the support rod 2111 are acrylic.
[0044] In this embodiment, when not in use, under the influence of gravity, when the support rod 2111 is inserted into the first through hole 2121 and / or the second through hole 2122 and the tray 211 is not subjected to other external forces, the tray 211 will contact the upper surface of the tray seat 212. The support rod 2111 passes through the first through hole 2121 and the second through hole 2122 and can slide up and down within them. When using this embodiment to demonstrate the phenomenon of the wing rising when the airflow in the wind tunnel passes over the wing, a model airplane wing is fixed to the upper surface of the tray 211 using adhesive, nails, threaded connections, etc., placed in the experimental area 2, and the power fan 1 is started. Then, the wing's rise before and after starting the power fan 1 can be observed through the transparent square tube 4. Under normal circumstances, after the power fan 1 is started, the airflow passing over the wing generates lift. Therefore, if the lift is greater than the weight of the tray 211 and the wing, the wing will drive the entire tray 211 to rise. The support rod 2111 will slide upward in the first through hole 2121 and the second through hole 2122, and may even temporarily disengage from the second through hole 2122. After the power fan 1 is turned off, the wing and the tray 211 will naturally fall back to the position in contact with the upper surface of the tray seat 212. At this time, the support rod 2111 will be reconnected to the second through hole 2122.
[0045] Example 2
[0046] Please see Figure 6 , Figure 7This embodiment is basically the same as Embodiment 1, except that this embodiment is used to measure lift under different angles of attack of the wing. Therefore, in this embodiment, the experimental area 2 uses an airborne measurement sample frame 22, including a base 20, a servo motor 225, a servo motor frame 224, a crossbar 226, a strain gauge connector 222, a strain gauge sensor 221, a second connecting rod 223, a lower computer 220, and a higher computer. The upper surface of the strain gauge sensor 221 is connected to the strain gauge connector 222. Specifically, the strain gauge connector 222 is locked to the strain gauge sensor 221 by a flange at the bottom. The lower surface of the strain gauge sensor 221 is connected to the base 20. The upper part of the strain gauge connector 222 is columnar, and the lower part is plate-shaped, with a rod-shaped connecting structure between them. The upper part of the servo motor frame 224 is cuboid, and the lower part is columnar. The strain gauge connector... The upper part of component 222 and the lower part of servo frame 224 are provided with grooves that can accommodate the second connecting rod 223. The upper end of the second connecting rod 223 is inserted into the groove on the lower part of servo frame 224, and the lower end is inserted into the groove on the upper part of strain gauge connector 222. The servo frame 224 is used to fix the servo 225. The upper part of the servo frame 224 is provided with a slot 2241 through which the rotation shaft of the servo 225 can pass. After the rotation shaft of the servo 225 extends into the slot 2241, it is connected to the servo connecting groove 2261 provided in the middle of one side of the crossarm 226. The other side of the crossarm 226 is connected to one side of the wing. Preferably, the servo 225 and the servo frame 224 can be further fixed by means of snap-fit, adhesive, threaded connection, etc. The servo 225 is used to adjust the angle of attack of the wing. The servo 225, strain gauge sensor 221 and lower computer 220 are electrically connected.
[0047] In this embodiment, the strain gauge sensor 221 is a strain gauge type 0-1Kg load cell, which is rectangular in shape. It is a force sensor with the following parameters: operating voltage: 12V DC; operating current: <60mA; nonlinearity: 0.03%FS; repeatability: 0.03%FS, meaning the maximum range can reach a resolution of 0.3 grams. The second connecting rod 223 is made of acrylic.
[0048] Please see Figure 1 , Figure 6 , Figure 8 The lower-level computer 220 is placed inside the transparent square tube 4 and includes a force sensor processing module, a wind speed sensor processing module, a microcontroller processing module, and a wireless communication module. The upper-level computer is placed outside the transparent square tube 4 and includes a microcontroller processing module, a wireless communication module, and a touch screen module. The upper-level computer and the lower-level computer 220 are connected wirelessly. In this embodiment, the wireless communication connection is specifically a 2.4GHz wireless connection. In this embodiment, the upper-level computer and the lower-level computer 220 should be able to perform the following functions:
[0049] The servo motor 225 controls the angle of attack of the wing to be tested relative to the airflow direction. This function can be controlled by the microcontroller processing module in the lower-level machine 220.
[0050] Two data points were collected: ① lift data from the test wing, and ② wind speed data.
[0051] It should have a touch screen for data display and command input, as well as a host computer control circuit.
[0052] Wireless communication between the host computer and the slave computer 220.
[0053] In this embodiment, the force sensor processing module is a conditioning circuit used in conjunction with the 0-1Kg load cell. Therefore, the HX711 load cell dedicated module is selected, which has a 24-bit AD resolution. The wind speed sensor processing module is a thermal-sensitive MODBUS wind speed sensing module. This sensor measures wind speed through a thermal wind sensor line. Its specific parameters are: operating voltage: 12V DC; operating current: <60mA; sensing wind speed: 0-15m / s, that is, its maximum wind speed measurement is 15m / s; output mode: 485 output. The wireless communication module is an NRF24L01 2.4G wireless module transmitter and receiver communication module. The main parameters of this communication module are: support for GFSK / FSK communication modulation; support for 2Mbps / 1Mbis / 250Kbps data rates, multiple transmit power options; 126 frequency points, supporting frequency hopping mode; receiving sensitivity range of -96dB. The touchscreen module uses a 7-inch HMI serial port intelligent display screen TJC8048X570_011C / R. This screen is a TFT intelligent screen and a capacitive / resistive touchscreen with a user-friendly development interface. Its overall dimensions are 180mm × 180mm. Since the lower-level machine 220 is located inside the transparent square tube 4 and cannot be directly powered externally, the lower-level machine 220 also has a battery.
[0054] When measuring lift under different angles of attack of an airfoil using this embodiment, the airfoil is first prepared. For example, a wing cross-section template is created using 3D printing, and then the airfoil test sample is cut out using the template. The rotation shaft of the servo motor 225 is then passed through slot 2241 and connected to the servo motor connection slot 2261. The prepared airfoil is then fixed to the opposite side of the crossarm 226 (opposite to the servo motor connection slot 2261) using adhesive, nails, or threads. After assembling the sample holder 22 for airborne measurement, it is placed in the experimental area 2. The power fan 1 is turned on, and the host computer and slave computer 220 are started. The user can not only see the airfoil lift as airflow passes through it, but also observe a scatter plot on the host computer's touchscreen showing that the airfoil's lift increases with increasing wind speed according to an approximately quadratic law, conforming to physical laws. The user can also obtain corresponding data from these scatter plots. The user can also control the servo motor 225 from the host computer's touchscreen to change the airfoil's angle of attack and observe the changes in the wind speed-lift relationship at different airfoil angles of attack.
[0055] This embodiment can also be used to demonstrate the trajectory of airflow as it passes over an aircraft wing, primarily achieved using the tracer smoke generator 5. An aircraft model wing is fixed to a crossarm 226 and placed in the experimental area 2. The tracer smoke generator 5 and the power fan 1 are then activated. The trajectory of the airflow as it passes over the wing can then be observed through a transparent tube 4 by watching the smoke emitted from the tracer smoke generator 5. Alternatively, the host and slave computers 220 can be accessed, and the servo motor 225 can be controlled via the host computer's touchscreen to change the wing's angle of attack. The changes in the airflow trajectory near the wing at different wing angles of attack can then be observed.
[0056] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0057] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A wind tunnel experimental apparatus, characterized in that: The system includes a power fan (1), an experimental area (2), a rectification area (3), a transparent square tube (4), and a tracer smoke generator (5). The transparent square tube (4) is a hollow structure with the power fan (1) installed on one side and the rectification area (3) installed on the other side. The power fan (1) is a fan matrix, and the power fan (1) draws air from one side of the rectification area (3) to the other side. The experimental area (2) is located between the power fan (1) and the rectification area (3). The tracer smoke generator (5) is located outside the transparent square tube (4) and connected to the rectification area (3). The rectification area (3) is a pipe matrix composed of pipes (31).
2. The wind tunnel experimental apparatus according to claim 1, characterized in that: The pipe (31) is a PVC pipe.
3. The wind tunnel experimental apparatus according to claim 2, characterized in that: The transparent square tube (4) is made of acrylic.
4. The wind tunnel experimental apparatus according to claim 3, characterized in that: The power fan (1) is a 3×3 fan matrix.
5. The wind tunnel experimental apparatus according to claim 4, characterized in that: The tracer smoke generator (5) is provided with at least one smoke generator (51) and the same number of control circuit boards (52) as the smoke generator (51). Each smoke generator (51) is electrically connected to a control circuit board (52). The smoke generator (51) is provided with two smoke outlets (511).
6. The wind tunnel experimental apparatus according to claim 5, characterized in that: It also includes a guide frame (53), a cap (54), and a Y-shaped guide tube (55); the upper surface of the transparent square tube (4) near the opening of the rectification area (3) is provided with a positioning hole (41), and the lower surface is provided with a positioning block (42) corresponding to the positioning hole (41). The guide frame (53) is a hollow tube, one end of which is inserted into the positioning block (42), and the other end corresponds to the positioning hole (41). The cap (54) is detachably connected to the guide frame (53) through the positioning hole (41). The outer wall of the guide frame (53) is provided with at least one first input hole (531) and a second input hole (532) corresponding to the position of the first input hole (531). The two ends of the branched side of the Y-shaped guide tube (55) are detachably connected to the two smoke outlets (511) of the same smoke generator (51), and the unbranched side extends into a pipe (31) in the rectification area (3) after passing through the first input hole (531) and the corresponding second input hole (532).
7. The wind tunnel experimental apparatus according to claim 6, characterized in that: The experimental area (2) is a liftoff demonstration sample rack (21), which includes a base (20), a tray (211), a tray seat (212), a first bracket (214), a second bracket (215) and a first connecting rod (213); the upper surface of the tray (211) has a fixed angle of attack relative to the horizontal plane, and two ends of the lower surface of the tray (211) are respectively provided with support rods (2111) downward; the front of the tray seat (212) is in an "I" shape, and two sides of its upper end are respectively provided with a first through hole (2121) capable of accommodating the support rod (2111), and two sides of its lower end are respectively provided with a second through hole (2122) capable of accommodating the support rod (2111), and a connecting structure is provided between the upper end and the lower end, and the support rod (2111) passes through the first through hole (2121) and the second through hole (2122) and slides up and down therein; a first connection hole (2123) capable of accommodating the first connecting rod (213) is provided in the center of the upper end of the tray seat (212), and a second connection hole (2124) capable of accommodating the first connecting rod (213) is provided in the center of the lower end; the front of the first bracket (214) is in a "Ji" shape, the upper part of which is located between the second bracket (215) and the tray seat (212), and two ends of the lower part are respectively connected to the base (20); the second bracket (215) is in a cuboid shape, through holes capable of accommodating the first connecting rod (213) are provided on the upper surface of the upper part of the first bracket (214) and the second bracket (215), the first connecting rod (213) is inserted into the first connection hole (2123), the second connection hole (2124), the through hole on the first bracket (214) and the through hole on the second bracket (215), and the second bracket (215) is connected to the base (20).