Loop wind tunnel for meteorology

Abstract

The utility model provides a meteorological loop wind tunnel, which is characterized in that a power section, a diffusion section, a test section and a backflow section are sequentially closed to form a loop, the test section is composed of a plurality of test cavities which are sequentially and hermetically connected, and the number of the test cavities is greater than or equal to 2. The internal ventilation size of the test cavity channel is gradually reduced from the air inlet end to the air outlet end. According to the technical characteristics, under the condition that the power of the power section is inconvenient, the wind speed is indirectly changed through the multiple test cavities with different calibers, the test space and different test environments are increased, and the test applicability and the test efficiency are greatly improved.

Description

Technical Field

[0001] This invention generally relates to the field of wind tunnels, and specifically to a meteorological loop wind tunnel. Background Technology

[0002] A loop wind tunnel is a special type of wind tunnel facility characterized by airflow circulating within a closed loop. It typically includes a power section, a diffusion section, a test section, and a recirculation section. These sections are connected end-to-end to form a closed annular channel. Compared to open-loop wind tunnels, loop wind tunnels offer the advantage of providing stable and repeatable airflow conditions within a relatively small space.

[0003] Loop wind tunnels have numerous applications in meteorology, such as atmospheric boundary layer simulation. The atmospheric boundary layer is the layer of the atmosphere near the Earth's surface affected by ground friction. Loop wind tunnels can simulate the airflow characteristics within the atmospheric boundary layer by adjusting parameters such as airflow velocity, temperature, and roughness. For example, by laying materials with different roughnesses (such as sandpaper or grids) at the bottom of the wind tunnel, the frictional effects of different surface types (such as cities, forests, and deserts) on airflow can be simulated.

[0004] Meteorological instrument testing and calibration are crucial for obtaining accurate meteorological data, as the accuracy and reliability of meteorological instruments are paramount. Loop wind tunnels provide a stable and controllable airflow environment for testing the performance of meteorological instruments under varying wind speeds, directions, and temperature and humidity conditions. For example, anemometer calibration involves placing the anemometer in the working section of the wind tunnel, adjusting the wind speed to a known standard value, and comparing the anemometer's measured value with the standard value.

[0005] Research on pollutant diffusion reveals that the diffusion process of pollutants in the atmosphere is strongly influenced by meteorological conditions (such as wind speed, wind direction, and turbulence). Wind tunnels can simulate pollutant diffusion under different meteorological conditions. By releasing tracer gases (such as sulfur hexafluoride) or particulate matter to simulate pollutants in the wind tunnel, equipment such as lidar and particle counters are used to monitor their concentration distribution and diffusion paths within the wind tunnel, and to study parameters such as the turbulent diffusion coefficient.

[0006] When using a loop wind tunnel, staff need to place the test equipment in the test section according to the test objective, and then adjust the wind speed through the power section, thereby adjusting the air intake and flow rate of the test section. For various situations, staff need to conduct multiple tests and set different test parameters, which greatly reduces test efficiency. Summary of the Invention

[0007] In view of the problems existing in the prior art, the present invention provides a meteorological loop wind tunnel, which consists of a power section, a diffusion section, a test section, and a recirculation section that are sequentially closed to form a loop. The test section is composed of multiple sequentially sealed and connected test chambers, with the number of test chambers being greater than or equal to two. The internal ventilation dimensions of each test chamber decrease progressively from the air inlet to the air outlet. By possessing the above-mentioned technical features, even when power in the power section is inconvenient, wind speed can be indirectly changed through multiple test chambers of different diameters. Furthermore, it increases the test space and allows for different test environments, greatly improving the applicability and efficiency of the test.

[0008] In some embodiments, the test chamber includes a contraction chamber, which is tubular with a narrowed opening, and its inlet end is larger than its outlet end; and a pressure-stabilizing chamber, which is tubular with the same dimensions at both ends, and its inlet end is the same size as the outlet end of the contraction chamber and is sealed closed; the inlet end of the contraction chamber in an adjacent test chamber is sealed and fixed to the outlet end of the pressure-stabilizing chamber in another test chamber, and the inlet end dimension of the contraction chamber in one test chamber is the same as the outlet end dimension of the pressure-stabilizing chamber in the other test chamber. Thus, the two-part test chamber primarily guides and gathers the flowing air through the contraction chamber, while the pressure-stabilizing chamber primarily stabilizes the flowing air and secures the relevant test equipment.

[0009] In some embodiments, a speed-regulating component for adjusting the air intake volume is provided on one side of the pressure-stabilizing cavity. The speed-regulating component includes an adjusting wall abutting against the inner wall of one side of the pressure-stabilizing cavity; a driving member connected to the pressure-stabilizing cavity and the adjusting wall, used to adjust the distance between the adjusting wall and the abutting side wall of the pressure-stabilizing cavity; and an air intake guide plate, one end of which is hinged to the abutting side wall of the adjusting wall, and the other end of which is located on the side of the adjusting wall opposite to its abutting inner wall of the pressure-stabilizing cavity. Thus, by driving the adjusting wall to move, and coordinating with the swinging of the air intake guide plate, the flow space of the flowing air is restricted, further regulating the wind speed. This allows for controllable adjustment of the test environment inside the test section without changing the output power of the power section, improving the applicability of the test.

[0010] In some embodiments, a first torsion spring is sleeved on the hinge shaft of the air inlet guide plate, with both ends of the first torsion spring abutting against the sidewalls of the air inlet guide plate and the pressure stabilizing cavity, respectively. Thus, during the displacement of the regulating wall, the air inlet guide plate, under the elastic force of the first torsion spring, is constantly abutting against one side of the regulating wall, thereby blocking the space between the regulating wall and the sidewall of the pressure stabilizing cavity, ensuring the guiding flow of the air.

[0011] In some embodiments, the speed regulating assembly further includes an air outlet guide plate, which is located at the end of the regulating wall and hinged to it. A second torsion spring is sleeved on the hinge axis between the air outlet guide plate and the regulating wall. The two ends of the second torsion spring abut against the regulating wall and the air outlet guide plate, respectively, and drive the end of the air outlet guide plate to swing towards the side wall of the pressure stabilizing cavity. Thus, after the regulating wall is displaced, the air outlet guide plate, under the elastic action of the second torsion spring, keeps its end abutting against the side wall of the pressure stabilizing cavity at all times. This not only blocks the space between the regulating wall and the side wall of the pressure stabilizing cavity, restricting the entry of flowing air, but also provides a good transition when the air velocity is high, ensuring smooth airflow.

[0012] In some embodiments, two speed regulating components are provided and located on opposite sides of the pressure stabilizing cavity. This causes the regulating walls on both sides to shift simultaneously, which on the one hand accelerates the airflow speed regulation efficiency, and on the other hand improves the stability of airflow, ensuring that air flows steadily through the central space of the pressure stabilizing cavity.

[0013] In some embodiments, the air inlet guide plate is an arc-shaped plate, with its protruding side located on the side of the adjusting wall opposite to the sidewall of the pressure stabilizing cavity. Thus, the arc shape makes the transition between the adjusting wall and the sidewall of the pressure stabilizing cavity smoother, reducing obstruction to the flowing air.

[0014] In some embodiments, the upper and lower sides of the regulating wall abut against the upper and lower inner walls of the pressure-stabilizing cavity, respectively. This fills the gap between the regulating wall and the pressure-stabilizing cavity during the wall's displacement, ensuring airflow is directed to the predetermined area and reducing airflow loss.

[0015] It should be understood that the description in the Summary of the Invention is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0016] Figure 1 A schematic diagram of the overall structure of a meteorological loop wind tunnel according to an embodiment of the present invention is shown;

[0017] Figure 2 A schematic diagram of the power section structure in a meteorological loop wind tunnel according to an embodiment of the present invention is shown;

[0018] Figure 3 A schematic diagram of the diffuser section structure in a meteorological loop wind tunnel according to an embodiment of the present invention is shown;

[0019] Figure 4A schematic diagram of the internal structure of one side of a turning section in a meteorological loop wind tunnel according to an embodiment of the present invention is shown.

[0020] Figure 5 A schematic diagram of the test section structure in a meteorological loop wind tunnel according to an embodiment of the present invention is shown;

[0021] Figure 6 A cross-sectional view of a speed control component in a meteorological loop wind tunnel according to an embodiment of the present invention is shown.

[0022] Figure 7 This diagram illustrates the working state of a speed control component in a meteorological loop wind tunnel according to an embodiment of the present invention.

[0023] Symbol Explanation

[0024] 1. Power section; 11. Power pipe; 12. Fan; 13. Blade; 2. Diffuser section; 21. Diffuser pipe; 22. Cooling device; 3. First steering section; 31. First steering pipe; 32. First guide plate; 4. Second steering section; 41. Second steering pipe; 42. Second guide plate; 5. Test section; 51. Contraction cavity; 52. Pressure stabilizing cavity; 53. Speed ​​regulating component; 531. Adjusting wall; 532. Drive component; 533. Inlet air guide plate; 534. First torsion spring; 535. Outlet air guide plate; 536. Second torsion spring; 6. Return section; 7. Third steering section; 8. Fourth steering section. Detailed Implementation

[0025] The preferred embodiments (or implementation methods) of the present invention will now be described in detail with reference to the accompanying drawings.

[0026] This invention provides a meteorological loop wind tunnel, comprising a power section 1, a diffusion section 2, a first turning section 3, a second turning section 4, a test section 5, a recirculation section 6, a third turning section 7, and a fourth turning section 8, which are sequentially closed to form a loop. The test section 5 is composed of multiple test chambers connected sequentially, with at least two test chambers. The inlet diameter of each test chamber decreases sequentially from one side of the inlet end. This allows for wind speed regulation and provides multiple test positions, enabling simultaneous testing of various experiments, without changing the power in the power section 1, simply by varying the diameters of the multiple test chambers. This significantly improves usability and efficiency of the tests.

[0027] The following is for reference. Figures 1-7 This describes a novel meteorological loop wind tunnel.

[0028] Figure 1 A schematic diagram of the overall structure of a meteorological loop wind tunnel according to an embodiment of the present invention is shown. (Reference) Figure 1As shown, the meteorological loop wind tunnel provided in this embodiment includes a power section 1, a diffusion section 2, a first turning section 3, a second turning section 4, a test section 5, a recirculation section 6, a third turning section 7, and a fourth turning section 8, which are sequentially closed to form a loop.

[0029] Figure 2 A schematic diagram of the power section 1 in a meteorological loop wind tunnel according to an embodiment of this utility model is shown. (Reference) Figure 2 As shown, the power section 1 includes a power pipe 11, which can be a circular tube. A motor is coaxially mounted inside the pipe. Multiple blades 13 are coaxially fixed on the output shaft of the motor. The motor drives the blades 13 to rotate, thereby driving the air flow in the loop and causing the air to flow at high speed in the loop.

[0030] Figure 3 A schematic diagram of the diffuser section 2 in a meteorological loop wind tunnel according to an embodiment of this utility model is shown. (Reference) Figure 3 As shown, the diffuser section 2 includes a diffuser pipe 21, the diameter of which is smaller than ...

[0031] Because the temperature of the air in the annular space may rise after passing through test section 5 due to friction with the experimental equipment or energy conversion during the test, a cooling device 22 can be installed at the end of diffuser section 2 to reduce the heat in the air. The cooling device 22 can be fins or a heat exchanger, using air cooling to convert the heat in the air and lower its temperature. Alternatively, spaced cooling water pipes can be used; when hot air comes into contact with the pipe walls, heat is transferred to the cooling water through heat conduction, and then the cooling water carries the heat away.

[0032] Figure 4 This diagram illustrates the internal structure of a one-sided steering section in a meteorological loop wind tunnel according to an embodiment of the present invention. (Reference) Figure 4 As shown, the first turning section 3 includes a first turning pipe 31, whose inlet end is sealed to the outlet end of the diffuser pipe 21. A plurality of first guide plates 32 are provided in the middle region of the first turning pipe 31. The first guide plates 32 are arc-shaped, and their two ends are respectively fixed to the inner upper wall and inner lower wall of the first turning pipe 31. The plurality of first guide plates 32 are arranged at intervals, with one side edge pointing to the inlet end of the first turning pipe 31 and the other side edge pointing to the outlet end of the first turning pipe 31, so that a turning air channel is formed between adjacent first guide plates 32, and the air from the inlet end of the first turning pipe 31 is guided to its outlet end, thereby realizing the turning and stable flow of the flowing air.

[0033] The second turning section 4 includes a second turning pipe 41, the inlet end of which is sealed to the outlet end of the first turning pipe 31. A plurality of second guide plates 42 are provided in the middle region of the second turning pipe 41. The second guide plates 42 are arc-shaped, and their two ends are respectively fixed to the inner upper wall and inner lower wall of the second turning pipe 41. The plurality of second guide plates 42 are arranged at intervals, with one side edge pointing to the inlet end of the second turning pipe 41 and the other side edge pointing to the outlet end of the second turning pipe 41, so that a turning air duct is formed between adjacent second guide plates 42, and the air from the inlet end of the second turning pipe 41 is guided to its outlet end, thereby realizing the turning and stable flow of the flowing air.

[0034] Figure 5 A schematic diagram of the structure of test section 5 in a meteorological loop wind tunnel according to an embodiment of this utility model is shown. (Reference) Figure 5 As shown, test section 5 is composed of multiple test chambers connected sequentially, with a maximum of two test chambers. In this embodiment, two test chambers are used as an example. Each test chamber includes a front-end contraction chamber 51 and a pressure-stabilizing chamber 52 connected to the end of the contraction chamber 51. The contraction chamber 51 is tubular, with its inlet end having the same diameter as the outlet port of the second diversion section 4 and being sealed to the outlet port of the second diversion section 4. The outlet port diameter of the contraction chamber 51 is smaller than its inlet port diameter, and its sidewalls are rounded, thus converging and guiding the air. The pressure-stabilizing chamber 52 is a straight tube, with its inlet port diameter being the same as the outlet port diameter of the contraction chamber 51 and being sealed to the outlet port of the contraction chamber 51. In adjacent test chambers, the inlet end of the contraction chamber 51 has the same diameter as the outlet port diameter of the pressure-stabilizing chamber 52 in the adjacent test chamber, and is sealed to the outlet port of the pressure-stabilizing chamber 52, thus causing the diameter of the pressure-stabilizing chamber 52 in the sequentially arranged test chambers to decrease sequentially. When the power section 1 is working, the flowing air enters the test section 5 area and enters the pressure stabilizing chamber 52 in sequence through the contraction chamber 51. As the diameter of the test chamber decreases in sequence, the air flow rate is higher, thus providing test chambers with multiple test wind speeds and allowing simultaneous testing, which greatly improves the applicability and versatility of the loop wind tunnel.

[0035] To facilitate the adjustment of wind speed in test section 5, a speed regulating component 53 is installed in the pressure stabilizing channel 52 of each test chamber. Figure 6 A cross-sectional view of a speed control component 53 in a meteorological loop wind tunnel according to an embodiment of the present invention is shown. Figure 7 The diagram shows the working state of the speed control component 53 in a meteorological loop wind tunnel according to an embodiment of the present invention. (Refer to...) Figure 6 and Figure 7As shown, the speed regulating component 53 includes an adjusting wall 531, a driving component 532, an air inlet guide plate 533, a first torsion spring 534, an air outlet guide plate 535, and a second torsion spring 536. The adjusting wall 531 is vertically arranged and abuts against one side wall of the pressure stabilizing cavity 52, and the upper and lower edges of the adjusting wall 531 abut against the upper and lower cavity walls of the pressure stabilizing cavity 52. ​​The driving component 532 is provided on the outer wall of the pressure stabilizing cavity 52. ​​The driving component 532 can be a hydraulic cylinder. The body of the hydraulic cylinder is fixed to the outer wall of the pressure stabilizing cavity 52, and its output shaft passes through the side wall of the pressure stabilizing cavity 52 and is fixed to the adjusting wall 531. Thus, by controlling the hydraulic cylinder, the adjusting wall 531 can be moved towards the middle of the pressure stabilizing cavity 52.

[0036] In some embodiments, the drive element 532 can also be an electric push rod, whose structure and operating principle are the same as those of a hydraulic cylinder, and will not be described further here. Two drive elements 532 can be provided, arranged in parallel and spaced apart. The body of the drive element 532 is fixedly connected to the outer wall of the pressure stabilizing chamber 52. The output shaft of the drive element 532 passes through the side wall of the pressure stabilizing chamber 52, and the end of the output shaft is hinged to the adjusting wall 531. Thus, when both drive elements 532 operate simultaneously, the adjusting wall 531 and the pressure stabilizing chamber 52 can be manipulated to translate in a parallel state. Furthermore, the drive elements 532 can also operate asynchronously, thereby adjusting the displacement angle of the adjusting wall 531, making it more convenient to adjust the air inlet angle and air volume.

[0037] The air inlet guide plate 533 is located at the air inlet end of the regulating wall 531 and is arranged along the edge of the regulating wall 531. The upper and lower edges of the air inlet guide plate 533 abut against the upper and lower inner walls of the pressure stabilizing cavity 52. ​​The air inlet guide plate 533 is also hinged to the side wall of the pressure stabilizing cavity 52, and the end of the air inlet guide plate 533 abuts against the side of the regulating wall 531 away from the driving member 532. When the regulating wall 531 is displaced, it will cause the air inlet guide plate 533 to rotate around its hinge axis, thereby blocking the gap between the regulating wall 531 and the side wall of the pressure stabilizing cavity 52, thus guiding and concentrating the flowing air. Since the end of the air inlet guide plate 533 is located on the side of the regulating wall 531 away from the driving member 532, it is not only controlled by the push of the regulating wall 531, but also blocks the connection gap between the air inlet guide plate 533 and the regulating wall 531, reducing wind resistance.

[0038] In some embodiments, the air inlet guide plate 533 is arc-shaped, with its inner arc surface facing the direction of the drive member 532. This allows the arc-shaped air inlet guide plate 533 to provide greater displacement space for the adjustment wall 531 when the wall 531 is displaced, and also plays a role in smoothing the transition and reducing the resistance to airflow.

[0039] The first torsion spring 534 is sleeved on the hinge shaft between the Jinfeng guide plate and the pressure stabilizing cavity 52. ​​The two ends of the first torsion spring 534 abut against the side wall of the pressure stabilizing cavity 52 and the air inlet guide plate 533 respectively, so that the end of the air inlet guide plate 533 is pressed against the direction of the adjusting plate under the action of the first torsion spring 534, ensuring that the air inlet guide plate 533 and the adjusting plate are in close contact. Even when the adjusting wall 531 returns to its original position, the air inlet guide plate 533 can still rotate with the adjusting wall 531.

[0040] An air outlet guide plate 535 is disposed at the air outlet end of the regulating wall 531 and arranged along the edge of the regulating wall 531. The upper and lower edges of the air outlet guide plate 535 abut against the upper and lower inner walls of the pressure stabilizing cavity 52. ​​The air outlet guide plate 535 is also hinged to the air outlet edge of the regulating wall 531, and the end of the air outlet guide plate 535 abuts against the inner wall of the pressure stabilizing cavity 52 that the regulating wall 531 initially abuts against.

[0041] The second torsion spring 536 is sleeved on the hinge shaft between the air outlet guide plate 535 and the adjusting wall 531. Its two ends abut against one side of the air outlet guide plate 535 and the adjusting wall 531, respectively, so that the end of the air outlet guide plate 535 is tightly against the side wall of the pressure stabilizing cavity 52, avoiding most of the flowing air from entering the gap between the adjusting wall 531 and the inner wall of the pressure stabilizing cavity 52. ​​Moreover, it also plays a good role in stabilizing and guiding the flow when the air flow speed is high.

[0042] In some embodiments, two speed regulating components 53 may be provided and symmetrically arranged on the left and right side walls of the pressure stabilizing cavity 52. ​​When the left and right regulating walls 531 are adjusted simultaneously, the air inlet diameter inside the pressure stabilizing cavity 52 can be quickly changed, improving the regulation efficiency. Moreover, under the combined action of the two regulating walls 531, the air inlet channel is kept in the middle region of the pressure stabilizing cavity 52, thereby ensuring the stability of airflow.

[0043] like Figure 1 As shown, the recirculation section 6 is located after the test section 5. One end of it is sealed and fixed to the air outlet of the final pressure-stabilizing cavity 52, and the other end is used to connect with the air inlet of the third turning section 7. The cross-sectional area of ​​the recirculation section 6 gradually increases from the air inlet to the air outlet, thereby slowing down the high-speed airflow after passing through the test section 5, converting part of the airflow's kinetic energy into pressure energy, and thus reducing the airflow speed. This not only reduces the energy loss of the airflow but also allows the airflow to enter the next stage more smoothly.

[0044] The third steering section 7 and the fourth steering section 8 are connected in sequence and are symmetrically arranged with the first steering section 3 and the second steering section 4. The third steering section 7 includes a third steering pipe and a third guide plate located inside the second steering pipe 41. The fourth steering section 8 includes a fourth steering pipe and a fourth guide plate located on the inner wall of the fourth steering pipe. The third steering pipe, the third guide plate, the fourth steering pipe, and the fourth guide plate have the same structure and function as the first steering pipe 31 and the first guide plate 32, and will not be described in detail. The air outlet end of the fourth steering section 8 is sealed and fixedly connected to the end of the power section 1.

[0045] In the description of this specification, the terms "connection," "installation," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A meteorological loop wind tunnel, comprising a power section (1), a diffusion section (2), a test section (5), and a recirculation section (6) sequentially closed to form a loop, characterized in that, The test section (5) consists of multiple test cavities that are sequentially sealed and connected, and the number of test cavities is greater than or equal to 2. The internal ventilation dimensions of the test cavity decrease progressively from the air inlet to the air outlet.

2. The meteorological loop wind tunnel according to claim 1, characterized in that, The test cavity includes The constriction cavity (51) is tubular with a constricted opening, and its inlet end size is larger than its outlet end size; The pressure stabilizing cavity (52) is tubular, with the same size at both ends. Its inlet end is the same size as the outlet end of the contraction cavity (51) and is sealed closed. The inlet end of the contraction channel (51) in the adjacent test chamber is sealed and fixed to the outlet end of the pressure stabilizing channel (52) in another test chamber, and the inlet end size of the contraction channel (51) in the test chamber is the same as the outlet end size of the pressure stabilizing channel (52) in another test chamber.

3. A meteorological loop wind tunnel according to claim 2, characterized in that, A speed regulating component (53) for adjusting the air intake volume is provided on one side of the pressure regulating cavity (52). The speed regulating component (53) includes... The regulating wall (531) abuts against the inner wall of one side of the pressure stabilizing cavity (52); The driving component (532) is connected to the voltage stabilizing cavity (52) and the adjusting wall (531) and is used to adjust the distance between the adjusting wall (531) and the abutting side wall of the voltage stabilizing cavity (52); The air inlet guide plate (533) has one end hinged to the side wall of the regulating wall (531), and the other end is located on the side of the regulating wall (531) away from the inner wall of the pressure stabilizing cavity (52).

4. A meteorological loop wind tunnel according to claim 3, characterized in that, A first torsion spring (534) is sleeved on the hinge shaft of the air inlet guide plate (533), and the two ends of the first torsion spring (534) abut against the side walls of the air inlet guide plate (533) and the pressure stabilizing cavity (52), respectively.

5. A meteorological loop wind tunnel according to claim 3, characterized in that, The speed regulating component (53) further includes an air outlet guide plate (535), which is located at the end of the regulating wall (531) and is hinged to the regulating wall (531). A second torsion spring (536) is sleeved on the hinge shaft between the air outlet guide plate (535) and the regulating wall (531). The two ends of the second torsion spring (536) abut against the regulating wall (531) and the air outlet guide plate (535) respectively, and drive the end of the air outlet guide plate (535) to swing towards the side wall of the regulating wall (531) abutting against the pressure stabilizing cavity (52).

6. A meteorological loop wind tunnel according to claim 5, characterized in that, Two speed regulating components (53) are provided and located on opposite sides of the voltage regulating cavity (52).

7. A meteorological loop wind tunnel according to claim 3, characterized in that, The air inlet guide plate (533) is an arc-shaped plate, with its protruding side located on the side of the regulating wall (531) away from the side wall of the pressure stabilizing cavity (52).

8. A meteorological loop wind tunnel according to claim 3, characterized in that, The upper and lower sides of the regulating wall (531) abut against the upper and lower inner walls of the pressure stabilizing cavity (52), respectively.

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