A wind tunnel multi-point data acquisition device and mobile control method

Abstract

A kind of wind tunnel multipoint data acquisition device and mobile control method, belong to wind tunnel experimental technical field, the surface of its disc rack is connected with the sliding track of cross distribution;The central position of sliding track is connected with driving shaft, driving shaft is connected with power arm, power arm is connected with transmission arm;The end of transmission arm is connected with measuring point surface mechanism;Measuring point surface mechanism includes several mutually hinged rod bodies, several rod bodies are mutually hinged to form annular acquisition assembly, annular acquisition assembly is distributed with probe measuring point;Measuring point surface mechanism also includes adjusting slider, adjusting slider is in the inside of sliding track;The back of annular acquisition assembly is connected adjusting slider;Power arm drives annular acquisition assembly to contract or expand by transmission arm, the contraction or expansion of annular acquisition assembly drives adjusting slider to slide in the inside of sliding track.The present application solves the problem that traditional scheme cannot realize the fine collection of flow field data and cannot accurately judge the change of flow field behind experimental wind turbine.

Description

Technical Field

[0001] This invention belongs to the field of wind tunnel experimental technology, specifically relating to a wind tunnel multi-point data acquisition device and a movement control method. Background Technology

[0002] Currently, in wind tunnel flow field measurements, a moving probe device is used to install and position probes, enabling their axial movement and positioning. The probes are fixed to the front end of the moving probe device. The device moves a grid surface covered with a certain number of probes to a designated position, where it stops and remains stationary. The measurement and control system collects and records the flow field data at that location. After data acquisition, the moving probe device moves the grid surface to the next measurement position, and the measurement and control system continues collecting data, sequentially completing the acquisition of flow field data for different cross-sections.

[0003] Traditional wind tunnel testing methods primarily involve fixed cross-shaped measuring points, with these points arranged on each downstream section, typically in a single row or column. This results in limited data collection, while simulation calculations require data on the flow field across the entire interface. Consequently, the comparability between wind tunnel experimental and simulation results is poor. Furthermore, the cross-shaped measuring point arrangement makes it difficult to collect data on eddies within the flow field, hindering accurate assessment of wind speed, turbulence, and other flow field changes behind the experimental wind turbine. Summary of the Invention

[0004] To address this, the present invention provides a wind tunnel multi-point data acquisition device and a mobile control method, which solves the problem that traditional solutions cannot achieve refined acquisition of flow field data and cannot accurately determine the changes in flow field such as wind speed and turbulence behind the experimental wind turbine.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a wind tunnel multi-point data acquisition device, comprising a frame, wherein a cross-shaped sliding track is connected to the surface of the frame; a drive shaft is connected to the center of the sliding track, a power arm is connected to the drive shaft, and a transmission arm is connected to the power arm; a measuring point surface mechanism is connected to the end of the transmission arm; the measuring point surface mechanism is distributed on the outer side of the frame.

[0006] The measuring point surface mechanism includes several hinged rods, which are hinged together to form a ring-shaped acquisition assembly. The ring-shaped acquisition assembly has probe measuring points distributed on it. The measuring point surface mechanism also includes an adjusting slider, which is located inside the sliding track. The back of the ring-shaped acquisition assembly is connected to the adjusting slider.

[0007] The power arm drives the annular acquisition component to contract or expand via the transmission arm, and the contraction or expansion of the annular acquisition component causes the adjusting slider to slide inside the sliding track.

[0008] As a preferred embodiment of the wind tunnel multi-point data acquisition device, the four rods are hinged together to form a single acquisition unit, and the single acquisition units are hinged together to form the ring-shaped acquisition assembly.

[0009] As a preferred embodiment of the wind tunnel multi-point data acquisition device, the connection point between the power arm and the transmission arm is located in the middle of the power arm;

[0010] The power arm drives the transmission arm to rotate, thereby changing the distance between the annular acquisition component connected to the end of the transmission arm and the axis of the drive shaft.

[0011] As a preferred embodiment of the wind tunnel multi-point data acquisition device, the number of the adjusting sliders is four, and the four adjusting sliders are distributed in the sliding track in a cross shape.

[0012] The power arm drives the transmission arm to rotate, increasing the distance between the annular acquisition component connected to the end of the transmission arm and the axis of the drive shaft, and the adjusting slider slides away from the axis of the drive shaft.

[0013] The power arm drives the transmission arm to rotate, reducing the distance between the annular acquisition component connected to the end of the transmission arm and the axis of the drive shaft, and the adjusting slider slides towards the axis of the drive shaft.

[0014] As a preferred embodiment of the wind tunnel multi-point data acquisition device, during the rotation of the transmission arm driven by the power arm, the distance between the annular acquisition component connected to the end of the transmission arm and the axis of the drive shaft changes periodically.

[0015] When the power arm and the transmission arm are in a straight line and face the same direction, the distance between the annular acquisition component connected to the end of the transmission arm and the axis of the drive shaft is the largest.

[0016] When the power arm and the transmission arm are in a straight line and face opposite directions, the distance between the annular acquisition component connected to the end of the transmission arm and the axis of the drive shaft is minimized.

[0017] As a preferred embodiment of the wind tunnel multi-point data acquisition device, a fixed bushing is provided on the outer side of the drive shaft, and the fixed bushing is connected to the sliding rail through a fixed claw; a rotary drive motor is connected to the end of the drive shaft, and the rotary drive motor is located on the back of the disk frame.

[0018] As a preferred embodiment of the wind tunnel multi-point data acquisition device, the back of the disk frame is connected to a transfer frame, and the transfer frame is connected to a lifting drive mechanism.

[0019] The lifting drive mechanism includes a lifting slider, a lifting rail, a lifting chassis, and a lifting drive motor; the lifting slider is located inside the lifting rail, the lifting chassis is connected to the bottom of the lifting rail, the lifting drive motor is located on one side of the lifting chassis, and the lifting drive motor is connected to a lifting screw through a commutator inside the lifting chassis, and the lifting screw is connected to the lifting slider.

[0020] As a preferred embodiment of the wind tunnel multi-point data acquisition device, the bottom of the lifting drive mechanism is connected to a sliding adjustment mechanism, which includes a sliding seat, a pulley frame, a pulley block, and a sliding tray. The upper end of the sliding seat is connected to the lifting drive mechanism, and the lower end of the sliding seat is connected to the pulley block through the pulley frame. The pulley block is disposed inside the sliding tray.

[0021] This invention also provides a wind tunnel multi-point moving control method, which uses the above-mentioned wind tunnel multi-point data acquisition device to acquire measurement point surface data, and introduces a fluid motion equation for flow field visualization. The fluid motion equation uses a combination of two hyperbolic tangent functions to control the changes in the flow direction distance and time between the wind tunnel multi-point data acquisition device and the wind turbine, respectively.

[0022] As a preferred method for multi-point motion control in wind tunnels, the fluid motion equation is expressed as follows:

[0023]

[0024] In the formula, L represents the flow direction distance between the wind tunnel multi-point data acquisition device and the model wind turbine, t is the running time, and L max The maximum value of the flow direction spacing is given by V, where t0 is a parameter controlling the change over time. max α represents the maximum velocity of the flow field; α and β are parameters controlling the shape of the function.

[0025] The formula for the relationship between the multi-point data acquisition device in the cave and its movement with wind speed and time is:

[0026]

[0027] The formula for the scaling area change relationship of the multi-point data acquisition device for holes is:

[0028]

[0029] In the formula, u is the incoming air velocity.

[0030] This invention has the following advantages: it improves the existing single-row, single-column, or cross-shaped measuring point arrangement into a grid surface form, increasing the number of measuring points and enabling the simultaneous measurement of wind speed data at multiple points within the measuring point area, thus improving the flow field data acquisition rate; the measuring point area is adjustable, and the measurement range can be controlled at any time by scaling the measuring point area, for example, converting the flow field data of the entire wind tunnel cross section to the flow field data of the wind turbine rotor blades, and the measurement range can also be flexibly adjusted according to the wind turbine rotor diameter, reducing the probe arrangement process and improving the efficiency of wind tunnel experiments; it can adapt to changes in the number of wind turbines in the test section, and can realize the movement and positioning of the device in both the flow direction and vertical direction of the wind tunnel, completing the acquisition of flow field data at different positions and heights. Attached Figure Description

[0031] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0032] Figure 1 This is a three-dimensional structural diagram of the wind tunnel multi-point data acquisition device provided in an embodiment of the present invention;

[0033] Figure 2 This is a three-dimensional structural diagram of the wind tunnel multi-point data acquisition device provided in an embodiment of the present invention from another perspective;

[0034] Figure 3 This is a schematic diagram of the wind tunnel multi-point data acquisition device frame and measuring point surface mechanism provided in an embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the wind tunnel multi-point data acquisition device frame provided in an embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of the measuring point surface mechanism and surrounding structure of the wind tunnel multi-point data acquisition device provided in an embodiment of the present invention.

[0037] In the diagram, 1. Disc frame; 2. Sliding track; 3. Drive shaft; 4. Power arm; 5. Transmission arm; 6. Measuring point surface mechanism; 7. Rod body; 8. Annular acquisition component; 9. Probe measuring point; 10. Adjusting slider; 11. Acquisition unit; 12. Fixed bushing; 13. Fixed claw; 14. Rotary drive motor; 15. Adapter frame; 16. Lifting drive mechanism; 17. Lifting slider; 18. Lifting track; 19. Lifting chassis; 20. Lifting drive motor; 21. Sliding adjustment mechanism; 22. Sliding seat; 23. Pulley frame; 24. Pulley block; 25. Sliding tray. Detailed Implementation

[0038] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] When wind flows past rotating blades, the surrounding airflow is disturbed by the blades, forming vortices that exhibit certain spatial characteristics. The evolution of the wind turbine wake as it changes with space is called the spatial evolution of the wind turbine wake. Studying its characteristics mainly involves analyzing the patterns of its spatial distribution. Spatially, as the wake extends, it gradually diffuses and weakens, eventually mixing with and dissipating with the surrounding air. Studying the spatial distribution of the wake primarily involves analyzing its morphological changes, vortex characteristics, intensity variations, and spatial diffusion patterns at different locations downstream of the wind turbine. To study the spatial evolution of the wind turbine wake, a probe matrix, ranging from points to lines to surfaces, needs to be arranged across multiple spanwise sections in wind tunnel tests. However, the currently commonly used probe arrangement, a cross-shaped array, cannot meet this requirement.

[0040] In view of this, embodiments of the present invention provide a wind tunnel multi-point data acquisition device and a movement control method to solve the problem that traditional solutions cannot achieve refined acquisition of flow field data and cannot accurately determine changes in the flow field such as wind speed and turbulence behind the experimental wind turbine. The specific details of the embodiments of the present invention are as follows.

[0041] See Figure 1 , Figure 2 and Figure 3 This invention provides a wind tunnel multi-point data acquisition device, including a frame 1, on the surface of the frame 1 connected to sliding tracks 2 arranged in a cross shape; a drive shaft 3 is connected to the center of the sliding tracks 2, the drive shaft 3 is connected to a power arm 4, the power arm 4 is connected to a transmission arm 5; a measuring point surface mechanism 6 is connected to the end of the transmission arm 5; the measuring point surface mechanism 6 is distributed on the outside of the frame 1.

[0042] The measuring point surface mechanism 6 includes several hinged rods 7, which are hinged to each other to form a ring-shaped acquisition component 8. The ring-shaped acquisition component 8 has probe measuring points 9 distributed on it. The measuring point surface mechanism 6 also includes an adjusting slider 10, which is located inside the sliding track 2. The back of the ring-shaped acquisition component 8 is connected to the adjusting slider 10.

[0043] Among them, the power arm 4 drives the annular collection component 8 to contract or expand through the transmission arm 5, and the contraction or expansion of the annular collection component 8 causes the adjusting slider 10 to slide inside the sliding track 2.

[0044] In this embodiment, four rods 7 are hinged together to form a single acquisition unit 11, and the acquisition units 11 are hinged together to form a ring-shaped acquisition assembly 8. See also Figure 3 and Figure 4 The annular acquisition component 8 is equivalent to having two layers, inner and outer. The area of ​​the measuring point surface formed by the annular acquisition component 8 is adjustable. By scaling the measuring point surface, the measurement range can be controlled at any time. For example, the flow field data of the entire wind tunnel section can be converted into the flow field data within the range of the wind turbine rotor blades. The measurement range can also be flexibly adjusted according to the diameter of the wind turbine rotor, reducing the probe arrangement process and improving the efficiency of wind tunnel experiments.

[0045] Among them, the flow field data is collected by probe measuring point 9. The measurement principle of probe measuring point 9 itself has related technology. In the flow field, data such as pressure are usually measured. When probe measuring point 9 is placed in the flow field, it can be subjected to various forces from the fluid, such as inertial force, viscous force and pressure, so as to determine the pressure, velocity and other parameters of the fluid at that point.

[0046] In this embodiment, the connection point between the power arm 4 and the transmission arm 5 is located in the middle of the power arm 4; the power arm 4 drives the transmission arm 5 to rotate, so as to change the distance between the annular acquisition component 8 connected to the end of the transmission arm 5 and the axis of the drive shaft 3; there are four adjusting sliders 10, and the four adjusting sliders 10 are distributed in the sliding track 2 in a cross shape.

[0047] See Figure 3 , Figure 4 and Figure 5 Specifically, the power arm 4 and the transmission arm 5 form a two-bar linkage. When the drive shaft 3 drives the power arm 4 to rotate, since one end of the transmission arm 5 is hinged to the power arm 4 and the other end of the transmission arm 5 is hinged to the annular acquisition component 8 via a pin, the relative rotation between the power arm 4 and the transmission arm 5 causes the transmission arm 5 to contract or expand. The transmission arm 5 drives the annular acquisition component 8 to contract or expand, thereby changing the surface area of ​​the measuring point formed by the annular acquisition component 8. When the annular acquisition component 8 contracts or expands, the annular acquisition component 8 carries the adjusting slider 10 and moves in the sliding track 2. The adjusting slider 10 and the sliding track 2 limit the movement of the annular acquisition component 8, preventing it from rotating.

[0048] During the process of the power arm 4 driving the transmission arm 5 to rotate, causing the annular collection component 8 to expand, the distance between the annular collection component 8 connected to the end of the transmission arm 5 and the axis of the drive shaft 3 increases, and the adjusting slider 10 slides away from the axis of the drive shaft 3; during the process of the power arm 4 driving the transmission arm 5 to rotate, causing the annular collection component 8 to contract, the distance between the annular collection component 8 connected to the end of the transmission arm 5 and the axis of the drive shaft 3 decreases, and the adjusting slider 10 slides closer to the axis of the drive shaft 3.

[0049] In this embodiment, during the rotation of the drive arm 5 driven by the power arm 4, the distance between the annular acquisition component 8 connected to the end of the drive arm 5 and the axis of the drive shaft 3 changes periodically. When the power arm 4 and the drive arm 5 are in a straight line and facing the same direction, the distance between the annular acquisition component 8 connected to the end of the drive arm 5 and the axis of the drive shaft 3 is the largest. When the power arm 4 and the drive arm 5 are in a straight line and facing opposite directions, the distance between the annular acquisition component 8 connected to the end of the drive arm 5 and the axis of the drive shaft 3 is the smallest.

[0050] See Figure 3 , Figure 4 and Figure 5 Specifically, during the relative rotation of the two-bar linkage structure formed by the power arm 4 and the transmission arm 5, there is a maximum and minimum length of the two-bar linkage structure. When the power arm 4 and the transmission arm 5 are in the same direction and are in a straight line, the length of the two-bar linkage structure reaches the maximum value, and the annular acquisition component 8 expands to the maximum state. When the power arm 4 and the transmission arm 5 are in opposite directions and are in a straight line, the length of the two-bar linkage structure reaches the minimum value, and the annular acquisition component 8 contracts to the minimum state.

[0051] Understandably, when the annular acquisition component 8 is extended to its maximum state or retracted to its minimum state, the size of the configured sliding track 2 is adapted to the stroke of the adjustment slider 10 connected to the annular acquisition component 8.

[0052] In this embodiment, a fixed bushing 12 is provided on the outer side of the drive shaft 3, and the fixed bushing 12 is connected to the sliding rail 2 through a fixed claw 13; a rotary drive motor 14 is connected to the end of the drive shaft 3, and the rotary drive motor 14 is located on the back of the disk frame 1. The rotary drive motor 14 provides power to the drive shaft 3, thereby causing the drive shaft 3 to drive the power arm 4, and the power arm 4 drives the annular acquisition component 8 to achieve scaling through the transmission arm 5.

[0053] In this embodiment, the back of the tray 1 is connected to an adapter 15, and the adapter 15 is connected to a lifting drive mechanism 16. The lifting drive mechanism 16 includes a lifting slider 17, a lifting rail 18, a lifting chassis 19, and a lifting drive motor 20. The lifting slider 17 is located inside the lifting rail 18, the lifting chassis 19 is connected to the bottom of the lifting rail 18, and the lifting drive motor 20 is located on one side of the lifting chassis 19. The lifting drive motor 20 is connected to a lifting screw through a commutator inside the lifting chassis 19, and the lifting screw is connected to the lifting slider 17.

[0054] See Figure 1 and Figure 2 Specifically, the lifting drive mechanism 16 is connected to the rear fixed frame of the panel frame 1 via the lifting slider 17 inside the lifting rail 18. The lifting rail 18 contains a vertical lifting screw structure, and the lifting slider 17 engages with the lifting screw. The bottom lifting drive motor 20 drives the lifting screw to rotate, achieving lifting. The lifting drive motor 20 is horizontally mounted, and a commutator transmits horizontal force to the vertical lifting screw. The control unit for the lifting drive motor 20 is located in the controller above the lifting drive motor 20.

[0055] In one possible embodiment, a dustproof device is installed at the lower part of the commutator, and a protective cover is installed on the lifting drive motor 20, which serves to support the upper structure and protect the commutator.

[0056] In this embodiment, a sliding adjustment mechanism 21 is connected to the bottom of the lifting drive mechanism 16. The sliding adjustment mechanism 21 includes a sliding seat 22, a pulley frame 23, a pulley block 24, and a sliding tray 25. The upper end of the sliding seat 22 is connected to the lifting drive mechanism 16, and the lower end of the sliding seat 22 is connected to the pulley block 24 through the pulley frame 23. The pulley block 24 is disposed inside the sliding tray 25. The sliding adjustment mechanism 21 can drive the lifting drive mechanism 16 and the entire device to move horizontally, that is, the sliding seat 22 can slide along the sliding tray 25 through the pulley block 24.

[0057] This invention also provides a wind tunnel multi-point movement control method. It employs a wind tunnel multi-point data acquisition device as described in the above embodiments to acquire measurement point surface data. A fluid motion equation for flow field visualization is introduced. This fluid motion equation uses a combination of two hyperbolic tangent functions to control the changes in the flow direction distance and time between the wind tunnel multi-point data acquisition device and the wind turbine. This controls the displacement and scaling of the wind tunnel multi-point data acquisition device to achieve measurement of different locations in the wake field.

[0058] In this embodiment, a fluid motion equation for flow field visualization is introduced. This equation uses a combination of two hyperbolic tangent functions to control the changes in the flow direction distance (L) between the device and the wind turbine, and time (t), respectively:

[0059]

[0060] In the formula, L represents the flow direction distance between the wind tunnel multi-point data acquisition device and the model wind turbine, t is the running time, and L max The maximum value of the flow direction spacing is given by V, where t0 is a parameter controlling the change over time. max α represents the maximum value of the flow field velocity. α and β are parameters that control the shape of the function, determining the overall curve shape of the equation and how spacing and time affect the equation. Adjusting these parameters allows for flexible control of the flow field velocity variation with flow direction, spacing, and time, to conform to actual fluid motion characteristics.

[0061] In this embodiment, the formulas for the relationship between the device and wind speed, time movement, and area scaling are as follows:

[0062] First, assume the distance between the measuring point device and the model wind turbine is L:

[0063]

[0064] In the formula, u represents the incoming wind speed, and t represents the running time. The first segment defines the relationship between wind speed and wind speed when the wind speed is less than 7.5 m / s, and the second segment defines the relationship between wind speed and time when the wind speed is greater than or equal to 7.5 m / s.

[0065] Second, 's' represents the scaling factor of the measurement point surface:

[0066]

[0067] This equation defines the relationship between the flow direction spacing and time in different wind speed ranges. The wind speed ranges mentioned above can be flexibly adjusted according to the actual properties of the object being measured.

[0068] In summary, this invention includes a frame 1, with a cross-shaped sliding track 2 connected to its surface. A drive shaft 3 is connected to the center of the sliding track 2, and a power arm 4 is connected to the drive shaft 3. A transmission arm 5 is connected to the power arm 4. A measuring point surface mechanism 6 is connected to the end of the transmission arm 5. The measuring point surface mechanism 6 is located on the outer side of the frame 1. The measuring point surface mechanism 6 includes several hinged rods 7, which are hinged together to form a ring-shaped acquisition assembly 8. The ring-shaped acquisition assembly 8 has probe measuring points 9. The measuring point surface mechanism 6 also includes an adjusting slider 10, which is located inside the sliding track 2. The adjusting slider 10 is connected to the back of the ring-shaped acquisition assembly 8. The power arm 4 drives the ring-shaped acquisition assembly 8 to contract or expand via the transmission arm 5. The contraction or expansion of the ring-shaped acquisition assembly 8 causes the adjusting slider 10 to slide inside the sliding track 2. This invention uses modal decomposition to post-process the data acquired from the measuring point surface to predict the multi-point flow field in a wind tunnel. During modal decomposition, a data matrix is ​​constructed based on the velocity field measured in the time series. The amplitude and frequency of each flow field mode are calculated using singular vectors and singular values ​​to predict the wake effect of the wind field. This invention improves the existing single-row, single-column, or cross-shaped measuring point arrangement to a grid surface, increasing the number of measuring points and allowing for the simultaneous measurement of wind speed data at multiple points within the measuring point area, thus improving the flow field data acquisition rate. The measuring point area is adjustable; by scaling the measuring point area, the measurement range can be controlled at any time. For example, the flow field data measured across the entire wind tunnel cross-section can be converted to the flow field data measured within the range of the wind turbine rotor blades. The measurement range can also be flexibly adjusted according to the wind turbine rotor diameter, reducing the probe placement process and improving the efficiency of wind tunnel experiments. It can adapt to changes in the number of wind turbines in the test section and can move and position the device in both the flow direction and vertical direction of the wind tunnel, completing the acquisition of flow field data at different locations and heights.

[0069] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A wind tunnel multi-point data acquisition device, characterized in that, The device includes a frame (1), on which a cross-shaped sliding track (2) is connected; a drive shaft (3) is connected to the center of the sliding track (2), a power arm (4) is connected to the drive shaft (3), and a transmission arm (5) is connected to the power arm (4); a measuring point surface mechanism (6) is connected to the end of the transmission arm (5); the measuring point surface mechanism (6) is distributed on the outside of the frame (1). The measuring point surface mechanism (6) includes several hinged rods (7), which are hinged to each other to form an annular acquisition assembly (8). The annular acquisition assembly (8) has probe measuring points (9) distributed on it. The measuring point surface mechanism (6) also includes an adjusting slider (10), which is located inside the sliding track (2). The back of the annular acquisition assembly (8) is connected to the adjusting slider (10). The power arm (4) drives the annular collection component (8) to contract or expand via the transmission arm (5), and the contraction or expansion of the annular collection component (8) causes the adjusting slider (10) to slide inside the sliding track (2).

2. The wind tunnel multi-point data acquisition device according to claim 1, characterized in that, The four rods (7) are hinged together to form a collection unit (11), and the collection units (11) are hinged together to form the annular collection assembly (8).

3. The wind tunnel multi-point data acquisition device according to claim 1, characterized in that, The connection point between the power arm (4) and the transmission arm (5) is located in the middle of the power arm (4); The power arm (4) drives the transmission arm (5) to rotate, thereby changing the distance between the axis of the annular acquisition component (8) and the drive shaft (3) connected to the end of the transmission arm (5).

4. The wind tunnel multi-point data acquisition device according to claim 3, characterized in that, The number of the adjusting sliders (10) is four, and the four adjusting sliders (10) are distributed in the sliding track (2) in a cross shape; The power arm (4) drives the transmission arm (5) to rotate, increasing the distance between the annular acquisition component (8) connected to the end of the transmission arm (5) and the axis of the drive shaft (3), and the adjusting slider (10) slides away from the axis of the drive shaft (3); The power arm (4) drives the transmission arm (5) to rotate, thereby reducing the distance between the annular acquisition component (8) connected to the end of the transmission arm (5) and the axis of the drive shaft (3), and the adjusting slider (10) slides towards the axis of the drive shaft (3).

5. The wind tunnel multi-point data acquisition device according to claim 4, characterized in that, During the rotation of the power arm (4) driving the transmission arm (5), the distance between the annular acquisition component (8) connected to the end of the transmission arm (5) and the axis of the drive shaft (3) changes periodically. When the power arm (4) and the transmission arm (5) are in a straight line and face the same direction, the distance between the center of the annular acquisition component (8) and the drive shaft (3) connected to the end of the transmission arm (5) is the largest. When the power arm (4) and the transmission arm (5) are in a straight line and are facing opposite directions, the distance between the center of the annular acquisition component (8) and the drive shaft (3) connected to the end of the transmission arm (5) is the smallest.

6. The wind tunnel multi-point data acquisition device according to claim 1, characterized in that, The drive shaft (3) is provided with a fixed bushing (12) on the outside. The fixed bushing (12) is connected to the sliding rail (2) through a fixed claw (13). The end of the drive shaft (3) is connected to a rotary drive motor (14), which is located on the back of the plate frame (1).

7. The wind tunnel multi-point data acquisition device according to claim 1, characterized in that, The back of the tray (1) is connected to a transfer frame (15), and the transfer frame (15) is connected to a lifting drive mechanism (16). The lifting drive mechanism (16) includes a lifting slider (17), a lifting rail (18), a lifting chassis (19), and a lifting drive motor (20). The lifting slider (17) is located inside the lifting rail (18), the lifting chassis (19) is connected to the bottom of the lifting rail (18), the lifting drive motor (20) is located on one side of the lifting chassis (19), and the lifting drive motor (20) is connected to a lifting screw through a commutator inside the lifting chassis (19). The lifting screw is connected to the lifting slider (17).

8. The wind tunnel multi-point data acquisition device according to claim 7, characterized in that, The bottom of the lifting drive mechanism (16) is connected to a sliding adjustment mechanism (21). The sliding adjustment mechanism (21) includes a sliding seat (22), a pulley frame (23), a pulley block (24), and a sliding tray (25). The upper end of the sliding seat (22) is connected to the lifting drive mechanism (16), and the lower end of the sliding seat (22) is connected to the pulley block (24) through the pulley frame (23). The pulley block (24) is located inside the sliding tray (25).

9. A method for multi-point movement control in a wind tunnel, characterized in that, The wind tunnel multi-point data acquisition device according to any one of claims 1 to 8 is used to acquire measurement point surface data, and a fluid motion equation for flow field visualization is introduced. The fluid motion equation uses a combination of two hyperbolic tangent functions to control the changes in the flow direction distance and time between the wind tunnel multi-point data acquisition device and the wind turbine, respectively.

10. A wind tunnel multi-point movement control method according to claim 9, characterized in that, The equation of motion for fluid is expressed as follows: ； In the formula, L represents the flow-direction distance between the wind tunnel multi-point data acquisition device and the model wind turbine, and t is the running time. This represents the maximum value of the flow spacing. Parameters that control changes over time. This represents the maximum value of the flow field velocity; and These are parameters that control the shape of the function; The formula for the relationship between the multi-point data acquisition device in the cave and its movement with wind speed and time is: ； The formula for the scaling area change relationship of the multi-point data acquisition device for holes is: ； In the formula, u is the incoming air velocity.

Images