A double-layer nested active turbulent grid system

Abstract

The application discloses a double-layer nested active turbulent grid system, which comprises double-layer nested grid vanes, a grid vane angle adjusting device, a grid frame and a general controller. The double-layer nested grid vanes are composed of inner grid vanes and outer grid vanes in a coaxial nesting mode. The grid vane angle adjusting device comprises inner grid vane angle adjusting devices and outer grid vane angle adjusting devices, and the outer grid vane angle adjusting devices are fixedly connected with the inner grid vane angle adjusting devices through motor connecting pieces. The inner and outer grid vane angle adjusting devices are in communication connection with the general controller, and are used for respectively adjusting the relative angle between the inner grid vanes and the outer grid vanes and the angle of the double-layer nested grid vanes as a whole. The coordinated control of the inner and outer grid vanes can be realized through the general controller, so that the blockage of the grid can be continuously and real-timely adjusted, manual replacement of the grid vanes is not needed, and the flexibility of turbulent flow generation, the control precision and the test efficiency are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of turbulence grid technology, and more specifically, to a double-layer nested active turbulence grid system. Background Technology

[0002] Reproducing the flow environment in which an aircraft operates in an airborne wind tunnel and monitoring its aerodynamics, control stability, and maneuverability are crucial steps in the design, optimization, and evaluation of aircraft. Typical airborne wind tunnels are usually used to generate uniform flow fields with low turbulence. However, the low-altitude flight environment within the near-surface atmospheric boundary layer often presents complex wind conditions such as turbulence, wind shear, and gusts.

[0003] To reproduce this typical low-altitude airspace flight environment in an air tunnel, existing methods utilize active turbulence grid technology. Figure 1(a) shows a schematic diagram of the working principle of the active turbulence grid, and Figure 1(b) shows schematic diagrams of three typical grid blade forms: a non-perforated form, a circular perforated form, and a triangular perforated form. The grid blades are generally made of planar solid thin sheets. By driving the horizontally and vertically distributed blade groups with a motor, and coupling them with the uniform incoming flow in the wind tunnel test section, a fully developed turbulent wind environment can be generated, or wind shear, gusts, and wind conditions simulating the atmospheric boundary layer can be constructed. The direction of the incoming flow is generally perpendicular to the plane of the grid, that is, perpendicular to the plane of the paper in Figure 1(a).

[0004] As shown in the third type of grille vane in Figure 1(b), by opening triangular through holes in the grille vane and controlling the ratio of the through hole area to the outer surface area of ​​the grille vane, the blockage degree of the active grille relative to the incoming flow can be adjusted, thereby modulating the turbulence intensity and integral scale of the flow field generated by the active grille. Thus, by controlling the ratio of the through hole area to the grille vane area, the turbulence intensity and integral scale of the flow field generated by the active grille can be controlled. However, the drawback of this method is that if the ratio of the through hole area to the grille vane area needs to be changed, grille vanes with different through hole sizes need to be manually replaced, making real-time continuous control of the turbulence field impossible and resulting in low efficiency. Summary of the Invention

[0005] This invention provides a double-layer nested active turbulence grid system, which enables real-time continuous control of the turbulent field and improves efficiency. The specific technical solution is as follows.

[0006] In a first aspect, the present invention provides a double-layer nested active turbulence grid system, comprising: a main controller, a grid frame, double-layer nested grid blades arranged in n rows and m columns in a cross pattern within the grid frame, and grid blade angle adjustment devices installed outside the grid frame that correspond one-to-one with the double-layer nested grid blades in each row and column, wherein n and m are both positive integers not less than 5.

[0007] The grid vane angle adjustment device includes an inner grid vane angle adjustment device and an outer grid vane angle adjustment device fixedly connected to the inner grid vane angle adjustment device via a motor connector. Both the inner and outer grid vane angle adjustment devices are communicatively connected to the main controller.

[0008] The double-layer nested grid wing includes an outer grid wing and an inner grid wing coaxially nested within the outer grid wing. The inner grid wings in the same row / column are connected to the corresponding inner grid wing angle adjustment device through the same inner wing shaft, and the outer grid wings in the same row / column are connected to the corresponding outer grid wing angle adjustment device through the same outer wing shaft.

[0009] The main controller controls the angle adjustment device of each inner grid wing to drive each inner grid wing to rotate relative to each outer grid wing by a target angle in the target direction through the shaft of each inner wing;

[0010] The main controller, based on the control strategy, controls the angle adjustment devices of each outer grille wing to drive each outer grille wing through each outer wing shaft, and to drive each inner grille wing to rotate according to the rotation mode corresponding to the control strategy through each motor connector.

[0011] Optionally, the outer grille vane angle adjustment device includes a rotary motor, a first coupling and a motor support frame, and the inner grille vane angle adjustment device includes an angle motor, a second coupling, a slip ring and a slip ring support frame;

[0012] The motor support frame is fixedly installed outside the grid frame, the rotary motor is fixedly installed on the motor support frame, the drive shaft of the rotary motor is a hollow shaft, one end of the drive shaft is fixedly connected to the outer blade shaft through the first coupling, the other end of the drive shaft is fixedly connected to the angle motor through the motor connector, and the input end of the rotary motor is connected to the main controller.

[0013] The outer blade shaft is a hollow shaft. The inner blade shaft passes through the outer blade shaft and is connected to the output shaft of the angle motor through the second coupling located inside the motor connector. The input end of the angle motor is connected to one end of the slip ring that passes through the slip ring support frame. The other end of the slip ring is connected to the main controller. The slip ring support frame is fixedly installed on the motor support frame.

[0014] Optionally, the outer grille wing angle adjustment device further includes a rotary bearing and a retaining ring;

[0015] The rotary bearing is sleeved on the outer periphery of the outer blade shaft, and the retaining ring presses the rotary bearing against the outside of the grid frame.

[0016] Optionally, the above-mentioned double-layer nested active turbulence grid system also includes a rotary motor driver and an angle motor driver;

[0017] The input end of the rotary motor is connected to the main controller via the rotary motor driver, and the other end of the slip ring is connected to the main controller via the angle motor driver.

[0018] Optionally, each inner grid wing in the same row / column is provided with an inner wing shaft hole that communicates with each other, and each inner grid wing is fixedly connected to the inner wing shaft provided in the inner wing shaft hole.

[0019] Optionally, when the rotation mode is a fixed speed mode, the main controller sends rotation commands for each first outer grille wing to the corresponding outer grille wing angle adjustment device. The first outer grille wing rotation command includes a first initial direction, a first rotation speed, and a first rotation interval time, and the first rotation speed included in each first outer grille wing rotation command is the same.

[0020] For each outer grille wing angle adjustment device, the outer grille wing angle adjustment device receives the corresponding first outer grille wing rotation command, which drives each outer grille wing connected to the outer grille wing angle adjustment device and each inner grille wing nested in each outer grille wing to rotate in the first initial direction at the first rotation speed, and to change direction according to the first rotation interval time.

[0021] Optionally, when the rotation mode is a time-single random mode, the main controller sends rotation commands for each second outer grille wing to the corresponding outer grille wing angle adjustment device. The second outer grille wing rotation command includes a second initial direction, a second rotation speed, and a first rotation interval time change condition. The second rotation speed included in each second outer grille wing rotation command is the same.

[0022] For each outer grille wing angle adjustment device, the outer grille wing angle adjustment device receives the corresponding second outer grille wing rotation command, which drives each outer grille wing connected to the outer grille wing angle adjustment device and each inner grille wing nested in each outer grille wing to rotate in the second initial direction at the second rotation speed, and to change direction according to the rotation interval time corresponding to the first rotation interval time change condition.

[0023] Optionally, when the rotation mode is a single random speed mode, the main controller sends rotation commands for each third outer grille wing to the corresponding outer grille wing angle adjustment device. The rotation commands for each third outer grille wing include a third initial direction, a second rotation interval time, and a first rotation speed change condition. The second rotation interval time included in each third outer grille wing rotation command is the same.

[0024] For each outer grille wing angle adjustment device, the outer grille wing angle adjustment device receives the corresponding third outer grille wing rotation command, which drives each outer grille wing connected to the outer grille wing angle adjustment device and each inner grille wing nested in each outer grille wing to rotate in the third initial direction at the rotation speed corresponding to the first rotation speed change condition, and changes direction according to the second rotation interval time.

[0025] Optionally, when the rotation mode is a dual random mode, the main controller sends rotation commands for each fourth outer grille wing to the corresponding outer grille wing angle adjustment device, wherein the rotation commands for the fourth outer grille wing include a fourth initial direction, a second rotation interval time change condition, and a second rotation speed change condition.

[0026] For each outer grille wing angle adjustment device, the outer grille wing angle adjustment device receives the corresponding fourth outer grille wing rotation command, which drives each outer grille wing connected to the outer grille wing angle adjustment device and each inner grille wing nested in each outer grille wing to rotate in the fourth initial direction at the rotation speed corresponding to the second rotation speed change condition, and to change direction according to the rotation interval time corresponding to the second rotation interval time change condition.

[0027] Optionally, the target angle ranges from 0 to 90°.

[0028] As described above, the double-layer nested active turbulence grid system provided by this invention includes: a main controller, a grid frame, double-layer nested grid blades arranged in an n-row, m-column cross pattern within the grid frame, and grid blade angle adjustment devices installed outside the grid frame, each corresponding to one of the double-layer nested grid blades in each row and column, wherein n and m are both positive integers not less than 5; the grid blade angle adjustment devices include an inner grid blade angle adjustment device and an outer grid blade angle adjustment device fixedly connected to the inner grid blade angle adjustment device via a motor connector, and both the inner and outer grid blade angle adjustment devices are communicatively connected to the main controller; the double-layer nested grid blades... The unit includes outer grille vanes and inner grille vanes coaxially nested within the outer grille vanes. Inner grille vanes in the same row / column are connected to corresponding inner grille vane angle adjustment devices via the same inner vane shaft. Outer grille vanes in the same row / column are connected to corresponding outer grille vane angle adjustment devices via the same outer vane shaft. The main controller controls each inner grille vane angle adjustment device to rotate relative to each outer grille vane by a target angle in the target direction via each inner vane shaft. Based on the control strategy, the main controller controls each outer grille vane angle adjustment device to drive each outer grille vane via each outer vane shaft, and to drive each inner grille vane to rotate according to the rotation mode corresponding to the control strategy via each motor connector. Therefore, by setting up a double-layer nested grid vane system, including inner and outer grid vanes, and a grid vane angle adjustment device, including an inner grid vane angle adjustment device and an outer grid vane angle adjustment device fixedly connected to the inner grid vane angle adjustment device via a motor connector, with both the inner and outer grid vane angle adjustment devices communicating with the main controller, the relative angle between the inner and outer grid vanes can be adjusted via the inner grid vane angle adjustment device, further changing the blockage degree of the double-layer nested grid vanes relative to the incoming flow. The angle of the outer grid vane can also be adjusted via the outer grid vane angle adjustment device, thus adjusting the overall angle of the double-layer nested grid vanes. This achieves the overall movement of the inner and outer grid vanes, thereby forming a corresponding turbulent field. It is evident that the relative angle between the inner and outer grid vanes can be automatically changed by the main controller alone, further changing the blockage degree of the double-layer nested grid vanes relative to the incoming flow in real time, without the need for manual replacement of the grid vanes. This enables real-time continuous control of the turbulent field, improving efficiency.

[0029] The innovative aspects of this invention include:

[0030] 1. By setting up double-layer nested grid vanes, including inner and outer grid vanes, and a grid vane angle adjustment device, including an inner grid vane angle adjustment device and an outer grid vane angle adjustment device fixedly connected to the inner grid vane angle adjustment device via a motor connector, both the inner and outer grid vane angle adjustment devices are communicatively connected to the main controller. This allows for adjustment of the relative angle between the inner and outer grid vanes via the inner grid vane angle adjustment device, further altering the relative flow blockage degree of the double-layer nested grid vanes. The outer grid vane angle adjustment device adjusts the overall angle of the double-layer nested grid vanes, thereby achieving overall movement of the inner and outer grid vanes to form a corresponding turbulent field. It is evident that the relative angle between the inner and outer grid vanes can be automatically changed by the main controller alone, further altering the relative flow blockage degree of the double-layer nested grid vanes in real time, without the need for manual replacement of the grid vanes. This enables real-time continuous control of the turbulent field, improving efficiency.

[0031] 2. By adjusting the angle of the inner grid vanes through the inner grid vane angle adjustment device, the relative angle between the inner and outer grid vanes can be changed. This allows for real-time adjustment of the blockage degree of the relative incoming flow between the double-layer nested grid vanes, enabling the double-layer nested grid vanes to generate a turbulent field with continuously adjustable turbulence parameters and a wide range of adjustable parameters. This solves the problem that the turbulence parameters of traditional active grids can only be adjusted within a limited range. It is suitable for wind tunnels with open / semi-open test sections, improving the applicability of the double-layer nested active turbulence grid system.

[0032] 3. By setting interconnected inner wing shaft holes between the inner wing blades in the same row / column, each inner wing blade is fixedly connected to the inner wing shaft set in the inner wing shaft hole.

[0033] 4. By setting the inner wing shaft to pass through the outer wing shaft and connecting it to the output shaft of the angle motor through a second coupling located inside the motor connector, the angle of the inner wing can be adjusted by the inner wing angle adjustment device, thereby changing the relative angle between the inner and outer wing.

[0034] 5. By setting one end of the rotary motor drive shaft to be fixedly connected to the outer wing shaft through the first coupling, and the other end of the drive shaft to be fixedly connected to the angle motor through the motor connector, the angle of the outer wing can be adjusted by the outer wing angle adjustment device, thereby achieving the purpose of the overall movement of the inner and outer wings.

[0035] 6. The rotation of the outer blade shaft is achieved by fitting a rotary bearing around the outer circumference of the outer blade shaft and pressing the rotary bearing against the grid frame with a retaining ring.

[0036] 7. Drive the rotary motor by setting a rotary motor driver, and drive the angle motor by setting an angle motor driver through a slip ring.

[0037] 8. The main controller sends rotation commands for each outer grid vane, including a first initial direction, a first rotation speed, and a first rotation interval, to the corresponding outer grid vane angle adjustment devices. It also sets the first rotation speed included in each outer grid vane rotation command to be the same. This causes each outer grid vane angle adjustment device to receive the corresponding outer grid vane rotation command, thereby driving each outer grid vane connected to the outer grid vane angle adjustment device and each inner grid vane nested within each outer grid vane to rotate in the first initial direction at the first rotation speed. The rotation speed is then changed according to the first rotation interval, so that each row / column of outer grid vanes and inner grid vanes rotate at a fixed speed to form a corresponding turbulent field.

[0038] 9. The main controller sends rotation commands for each of the second outer grid vanes, including a second initial direction, a second rotation speed, and a first rotation interval time change condition, to the corresponding outer grid vane angle adjustment devices. It also sets the second rotation speed included in each of the second outer grid vane rotation commands to be the same. This causes each outer grid vane angle adjustment device to receive the corresponding second outer grid vane rotation command, driving each outer grid vane connected to the outer grid vane angle adjustment device and each inner grid vane nested within each outer grid vane to rotate at the second rotation speed in the second initial direction. The rotation speed changes according to the rotation interval time corresponding to the first rotation interval time change condition, thus achieving a fixed speed rotation of each row / column of outer grid vanes and inner grid vanes according to the rotation interval time corresponding to the first rotation interval time change condition, thereby forming the corresponding turbulent field.

[0039] 10. The main controller sends rotation commands for each third outer grid vane, including a third initial direction, a second rotation interval time, and a first rotation speed change condition, to the corresponding outer grid vane angle adjustment devices. It also sets the second rotation interval time included in each third outer grid vane rotation command to be the same. This causes each outer grid vane angle adjustment device to receive the corresponding third outer grid vane rotation command, driving each outer grid vane connected to the outer grid vane angle adjustment device and each inner grid vane nested within each outer grid vane to rotate in the third initial direction at the rotation speed corresponding to the first rotation speed change condition. The rotation then changes direction according to the second rotation interval time, thus achieving rotation of each row / column of outer grid vanes and inner grid vanes as a whole at the rotation speed corresponding to the first rotation speed change condition according to a fixed rotation interval time, thereby forming the corresponding turbulent field.

[0040] 11. The main controller sends rotation commands for each of the fourth outer grid vanes, including the fourth initial direction, the second rotation interval time change condition, and the second rotation speed change condition, to the corresponding outer grid vane angle adjustment devices. This causes each outer grid vane angle adjustment device to receive the corresponding fourth outer grid vane rotation command, thereby driving each outer grid vane connected to the outer grid vane angle adjustment device and each inner grid vane nested within each outer grid vane to rotate in the fourth initial direction at the rotation speed corresponding to the second rotation speed change condition, and to change direction according to the rotation interval time corresponding to the second rotation interval time change condition. This achieves the rotation of each row / column of outer grid vanes and inner grid vanes as a whole at the rotation speed corresponding to the second rotation speed change condition and according to the rotation interval time corresponding to the second rotation interval time change condition, thereby forming the corresponding turbulent field.

[0041] Of course, implementing any product or method of the present invention does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0043] Figure 1(a) is a schematic diagram of the working principle of the active turbulence grid;

[0044] Figure 1(b) shows a schematic diagram of three typical grille vane forms for active turbulence grilles;

[0045] Figure 2 This is a schematic diagram of a double-layer nested active turbulence grid system provided in an embodiment of the present invention;

[0046] Figure 3 for Figure 2 A sectional view of region A in the diagram;

[0047] Figure 4 This is a schematic diagram of the structure of inner and outer grille fins in the same row provided in an embodiment of the present invention;

[0048] Figure 5 This is a partial structural schematic diagram of the inner and outer grille winglets provided in an embodiment of the present invention;

[0049] Figure 6(a) is a front view of the relative rotation of the inner and outer grille blades provided in an embodiment of the present invention;

[0050] Figure 6(b) is a top view of the relative rotation of the inner and outer grille blades provided in an embodiment of the present invention.

[0051] Figure 2 - In Figure 6(b), 1 is the grid frame, 2 is the double-layer nested grid wing, 21 is the inner grid wing, 22 is the outer grid wing, 3 is the grid wing angle adjustment device, 31 is the rotary motor, 311 is the drive shaft, 32 is the first coupling, 33 is the motor support frame, 34 is the angle motor, 35 is the second coupling, 36 is the slip ring, 37 is the slip ring support frame, 38 is the rotary bearing, 39 is the retaining ring, 4 is the motor connector, 5 is the inner wing shaft, and 6 is the outer wing shaft. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0053] It should be noted that the terms "comprising" and "having," and any variations thereof, in the embodiments and drawings of this invention are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0054] This invention discloses a double-layer nested active turbulence grid system, which enables real-time continuous control of the turbulent field and improves efficiency. The embodiments of this invention are described in detail below.

[0055] Figure 2 This is a schematic diagram of a double-layer nested active turbulence grid system provided in an embodiment of the present invention. Figure 3 for Figure 2 See the sectional view of region A in the diagram. Figure 2 and 3 The present invention provides a double-layer nested active turbulence grid system, comprising: a main controller, a grid frame 1, double-layer nested grid blades 2 arranged in n rows and m columns horizontally and vertically within the grid frame 1, and grid blade angle adjustment devices 3 installed outside the grid frame 1, each corresponding to one of the double-layer nested grid blades in each row and column. Here, n and m are both positive integers not less than 5, and n and m can be the same or different. The n rows of double-layer nested grid blades 2 and the m columns of double-layer nested grid blades 2 are located in different planes, meaning that each row corresponds to one grid blade angle adjustment device 3, and each column corresponds to one grid blade angle adjustment device 3.

[0056] The grid vane angle adjustment device 3 includes an inner grid vane angle adjustment device and an outer grid vane angle adjustment device that is fixedly connected to the inner grid vane angle adjustment device via a motor connector 4. Both the inner and outer grid vane angle adjustment devices are connected to the main controller for communication.

[0057] Figure 4 See the schematic diagram of the inner and outer grille fins in the same row provided in the embodiment of the present invention. Figures 2-4 The double-layer nested grid wing 2 includes an outer grid wing 22 and an inner grid wing 21 coaxially nested within the outer grid wing 22. The inner grid wing 21 in the same row / column is connected to the corresponding inner grid wing angle adjustment device through the same inner wing shaft 5, and the outer grid wing 22 in the same row / column is connected to the corresponding outer grid wing angle adjustment device through the same outer wing shaft 6.

[0058] Figure 5 This is a partial structural schematic diagram of the inner and outer grille fins provided in an embodiment of the present invention. Figure 5 For simplicity, the inner wing axis 5 and the outer wing axis 6 are not drawn; instead, the center lines of the axes are indicated by dashed lines.

[0059] See Figure 5 Only the double-layer nested grid winglets in columns B and C, and rows D and E are shown. Initially, the relative angle α between the inner grid winglet 21 and the outer grid winglet 22 is 0°, and the incoming flow direction is perpendicular to the plane containing the double-layer nested grid winglets 2. To facilitate rotation between different rows / columns, the axial spacing between adjacent grid winglets is set to M. To facilitate relative rotation between the inner and outer grid winglets 21 and 22, the gap between the inner and outer grid winglets is set to g1, and the gap between adjacent outer grid winglets 22 is set to g. The range of g1 and g can be between 0.5mm and 1mm.

[0060] The inner grille vanes 21 and outer grille vanes 22 in the same row rotate about the transverse inner vane axis 5, and the inner grille vanes 21 and outer grille vanes 22 in the same column rotate about the longitudinal inner vane axis 5. The inner grille vanes 21 in the same row / column rotate at the same rotational speed Ω, and the outer grille vanes 22 in the same row / column rotate at the same rotational speed. For example, the inner grille vanes 21 in row D rotate at the same rotational speed, and the inner grille vanes 21 in column B rotate at the same rotational speed.

[0061] The outer grille wing pieces 22 in the same row / column can be integrated or separate. If they are separate, they are fixedly connected. Also, the outer grille wing pieces 22 near the outer edge and the outer wing shaft 6 can be integrated or separate. If they are separate, the outer grille wing pieces 22 near the outer edge and the outer wing shaft 6 are fixedly connected. The fixed connection can be made by screws.

[0062] See also Figure 4 Each inner grille wing 21 in the same row / column is provided with an inner wing shaft hole that communicates with each other, and each inner grille wing 21 is fixedly connected to an inner wing shaft 5 disposed in the inner wing shaft hole. An exemplary fixed connection method can be adhesive bonding. Each inner grille wing 21 in the same row / column can be integrally set.

[0063] Thus, by setting interconnected inner wing shaft holes between each inner grating wing 21 in the same row / column, each inner grating wing 21 is fixedly connected to the inner wing shaft 5 set in the inner wing shaft hole.

[0064] The inner grille vane angle adjustment device is used to adjust the angle of the inner grille vane 21, thereby changing the relative angle between the inner grille vane 21 and the outer grille vane 22. The outer grille vane angle adjustment device is used to adjust the angle of the outer grille vane 22, thereby achieving overall movement of the inner grille vane 21 and the outer grille vane 22.

[0065] See also Figure 2 and Figure 3 The outer grille vane angle adjustment device includes a rotary motor 31, a first coupling 32, and a motor support frame 33, while the inner grille vane angle adjustment device includes an angle motor 34, a second coupling 35, a slip ring 36, and a slip ring support frame 37.

[0066] The motor support frame 33 is fixedly installed outside the grid frame 1, and the rotary motor 31 is fixedly installed on the motor support frame 33. The fixing method can be screw connection. The motor support frames 33 in each column / row can be grouped according to actual space requirements, and each group of motor support frames includes two or more integrally installed motor support frames 33, such as... Figure 2 As shown, there are five rows of motor support frames 33 above the grid frame 1. These five rows of motor support frames 33 are divided into two groups. One group consists of two corresponding motor support frames 33 installed together, and the other group consists of three corresponding motor support frames 33 installed together.

[0067] This method of grouping the motor support frames 33 into columns / rows, with each group including two or more integrated motor support frames 33, can save space.

[0068] See also Figure 3 The drive shaft 311 of the rotary motor 31 is a hollow shaft. One end of the drive shaft 311 is fixedly connected to the outer blade shaft 6 through the first coupling 32, and the other end of the drive shaft 311 is fixedly connected to the angle motor 34 through the motor connector 4. The input end of the rotary motor 31 is connected to the main controller.

[0069] The outer blade shaft 6 is a hollow shaft. The inner blade shaft 5 passes through the outer blade shaft 6 and is connected to the output shaft of the angle motor 34 through the second coupling 35 located inside the motor connector 5. The input end of the angle motor 34 is connected to one end of the slip ring 36 through the slip ring support frame 37. The other end of the slip ring 36 is connected to the main controller. The slip ring support frame 37 is fixedly installed on the motor support frame 33. The fixed installation method can be screw connection.

[0070] The working principle of adjusting the angle of the inner grille wing 21 by the inner grille wing angle adjustment device, thereby changing the relative angle between the inner grille wing 21 and the outer grille wing 22, is as follows:

[0071] The main controller drives the angle motor 34 through the slip ring 36, which in turn drives the inner wing shaft 5 to rotate through the second coupling 35. The inner wing shaft 5 drives the inner grid wing 21 of the corresponding column / row to rotate relative to the outer grid wing 22, thereby changing the relative angle between the inner grid wing 21 and the outer grid wing 22.

[0072] The working principle of adjusting the angle of the outer grille wing 22 by the outer grille wing angle adjustment device to achieve the overall movement of the inner grille wing 21 and the outer grille wing 22 is as follows:

[0073] The main controller controls the rotation of the rotary motor 31. One end of the rotary motor 31 drives the outer wing shaft 6 to rotate through the first coupling 32. The outer wing shaft 6 drives the corresponding column / row of outer grid wing 22 to rotate. At the same time, the other end of the rotary motor 31 drives the angle motor 34 to rotate through the motor connector 4. The angle motor 34 drives the corresponding column / row of inner grid wing 21 and outer grid wing 22 to rotate as a whole through the inner wing shaft 5.

[0074] Therefore, by setting the inner wing shaft 5 to pass through the outer wing shaft 6 and connect it to the output shaft of the angle motor 34 through the second coupling 35 located inside the motor connector 5, the angle of the inner wing 21 can be adjusted by the inner wing angle adjustment device, thereby changing the relative angle between the inner wing 21 and the outer wing 22.

[0075] By setting one end of the drive shaft 311 to be fixedly connected to the outer wing shaft 6 through the first coupling 32, and the other end of the drive shaft 311 to be fixedly connected to the angle motor 34 through the motor connector 4, the angle of the outer grille wing 22 can be adjusted by the outer grille wing angle adjustment device, thereby achieving the purpose of overall movement of the inner grille wing 21 and the outer grille wing 22.

[0076] See also Figure 2 and Figure 3 The outer grille wing angle adjustment device also includes a rotary bearing 38 and a retaining ring 39. The rotary bearing 38 is sleeved on the outer periphery of the outer wing shaft 6, and the retaining ring 39 presses the rotary bearing 38 against the outside of the grille frame 1.

[0077] Thus, the rotation of the outer blade shaft 6 is achieved by sleeved the rotary bearing 38 on the outer periphery of the outer blade shaft 6 and pressing the rotary bearing 38 against the outside of the grid frame 1 by the retaining ring 39.

[0078] The present invention provides a double-layer nested active turbulence grid system, which further includes a rotary motor driver and an angle motor driver. The input end of the rotary motor 31 is connected to the main controller through the rotary motor driver, and the other end of the slip ring 36 is connected to the main controller through the angle motor driver.

[0079] The main controller drives the rotary motor 31 via a rotary motor driver, and the main controller also drives the angle motor 34 via a slip ring 36 via an angle motor driver. Each row / column of double-layer nested grille fins 2 uses one rotary motor driver and one angle motor driver.

[0080] Therefore, a rotary motor driver is set to drive the rotary motor 31 to work, and an angle motor driver is set to drive the angle motor 34 to work through the slip ring 36.

[0081] During operation, in order to achieve real-time control of the turbulent field, the main controller controls the angle adjustment devices of each inner grid vane to drive each inner grid vane 21 to rotate relative to each outer grid vane 22 by a target angle in the target direction through each inner vane shaft 5. The target direction can be clockwise or counterclockwise.

[0082] Figure 6(a) is a front view of the relative rotation of the inner and outer grille winglets provided in the embodiment of the present invention, and Figure 6(b) is a top view of the relative rotation of the inner and outer grille winglets provided in the embodiment of the present invention. Referring to Figures 6(a) and 6(b), since the main controller only controls the inner grille winglet 22 to rotate by the target angle, and in the initial state, the relative angle α between the inner grille winglet 21 and the outer grille winglet 22 is 0°, the relative angle α between the inner grille winglet 21 and the outer grille winglet 22 at this time is the target angle, wherein the angle range of the target angle is 0-90°.

[0083] Referring again to Figures 6(a) and 6(b), the equivalent area A of the through hole can be adjusted by changing the relative angle α between the inner grille wing 21 and the outer grille wing 22. hole The size of the double-layer nested grid vane 2 is adjusted to change the overall blockage degree R. p This allows for the control of turbulence parameters in the generated turbulent field, thereby achieving the purpose of regulating the turbulent field. These turbulence parameters can include parameters such as turbulence intensity and integral scale.

[0084] Congestion degree R p Defined as the equivalent area A of the through hole hole Equivalent area A of the airfoil shape Wing The ratio of congestion level R p Between 0 and 1. Wherein, the equivalent area A of the through-hole... hole The equivalent area of ​​the through hole formed between the inner grille wing 21 and the outer grille wing 22 after rotation is A, and the equivalent area of ​​the wing shape is A. Wing This is the equivalent area of ​​the inner grille wing 21. In Figure 6(b), for ease of viewing, A is indicated... hole and A Wing It is only half the equivalent area.

[0085] After controlling the inner grille wing 21 to rotate, the main controller controls the angle adjustment devices of each outer grille wing to drive each outer grille wing 22 through each outer wing shaft 6, and to drive each inner grille wing 21 to rotate according to the rotation mode corresponding to the control strategy through each motor connector 4.

[0086] The control strategy corresponds to various rotation modes, including but not limited to the following:

[0087] The first method:

[0088] When the rotation mode is fixed speed mode, the main controller sends rotation commands for each first outer grille wing to the corresponding outer grille wing angle adjustment device. The rotation commands for each first outer grille wing include a first initial direction, a first rotation speed and a first rotation interval time, and the first rotation speed included in each first outer grille wing rotation command is the same.

[0089] For each outer grille wing angle adjustment device, the outer grille wing angle adjustment device receives the corresponding first outer grille wing rotation command, which drives each outer grille wing 22 connected to the outer grille wing angle adjustment device and each inner grille wing 21 nested in each outer grille wing 22 to rotate in the first initial direction at the first rotation speed, and change direction according to the first rotation interval time.

[0090] The fixed speed mode means that the outer grille wing 22 and inner grille wing 21 of each row / column rotate at a fixed speed. The rotation direction of the outer grille wing 22 and inner grille wing 21 of different rows / columns may be different or the same. Therefore, the first rotation speed included in the rotation command of each first outer grille wing is the same, but the first initial direction may be the same or different, and the first rotation interval time may be the same or different. For example, the first rotation speed can be 0 to 10 revolutions per second.

[0091] For example: Figure 5 As shown, the double-layer nested grid wing 2 in row D can rotate clockwise, the double-layer nested grid wing 2 in row E can rotate counterclockwise, the double-layer nested grid wing 2 in column B can rotate clockwise, and the double-layer nested grid wing 2 in column C can rotate counterclockwise. However, the rotation speed of row D, row E, column B, and column C is the same, which is the first rotation speed.

[0092] Therefore, the main controller sends rotation commands for each outer grid blade, including a first initial direction, a first rotation speed, and a first rotation interval, to the corresponding outer grid blade angle adjustment devices. By setting the first rotation speed included in each outer grid blade rotation command to be the same, the outer grid blade angle adjustment devices receive the corresponding outer grid blade rotation commands, thereby driving each outer grid blade 22 connected to the outer grid blade angle adjustment device and each inner grid blade 21 nested within each outer grid blade to rotate in the first initial direction at the first rotation speed and change direction according to the first rotation interval, so that the outer grid blade 22 and inner grid blade 21 of each row / column rotate at a fixed speed to form the corresponding turbulent field.

[0093] The second method:

[0094] When the rotation mode is time-random mode, the main controller sends rotation commands for each second outer grille wing to the corresponding outer grille wing angle adjustment device. The rotation commands for each second outer grille wing include a second initial direction, a second rotation speed, and a first rotation interval time change condition. The second rotation speed included in each second outer grille wing rotation command is the same.

[0095] For each outer grille wing angle adjustment device, the outer grille wing angle adjustment device receives the corresponding second outer grille wing rotation command, which drives each outer grille wing connected to the outer grille wing angle adjustment device and each inner grille wing nested in each outer grille wing to rotate in the second initial direction at the second rotation speed, and to change direction according to the rotation interval time corresponding to the first rotation interval time change condition.

[0096] The time-based random mode means that the outer grille wing 22 and inner grille wing 21 of each row / column rotate at a fixed speed according to the rotation interval time corresponding to the first rotation interval time variation condition. Therefore, the second rotation speed of each row / column is the same, but the rotation interval time determined by the first rotation interval time variation condition may be the same or different. The second initial direction may be the same or different.

[0097] The first rotation interval time variation condition characterizes the variation of the rotation interval time. It can be a fixed rotation interval time. For example, the range of the fixed rotation interval time can be 0 to 5 seconds. For example, the rotation direction is changed every 5 seconds, that is, 5 seconds of clockwise rotation, and then 5 seconds of counterclockwise rotation. Alternatively, it can be a variable rotation interval time. For example, the rotation interval time is increased by n seconds each time. Assuming that n is 1, the first 5 seconds are clockwise rotation, then 6 seconds are counterclockwise rotation, and then 7 seconds are clockwise rotation.

[0098] Therefore, the main controller sends rotation commands for each of the second outer grid vanes, including a second initial direction, a second rotation speed, and a first rotation interval time change condition, to the corresponding outer grid vane angle adjustment devices. It also sets the second rotation speed included in each of the second outer grid vane rotation commands to be the same. This causes each outer grid vane angle adjustment device to receive the corresponding second outer grid vane rotation command, driving each outer grid vane 22 connected to the outer grid vane angle adjustment device and each inner grid vane 21 nested within each outer grid vane to rotate at the second rotation speed in the second initial direction. Furthermore, they change direction according to the rotation interval time corresponding to the first rotation interval time change condition. This achieves the formation of a corresponding turbulent field by rotating each row / column of outer grid vanes 22 and inner grid vanes 21 at a fixed speed according to the rotation interval time corresponding to the first rotation interval time change condition.

[0099] The third method:

[0100] When the rotation mode is the speed single random mode, the main controller sends rotation commands for each third outer grille wing to the corresponding outer grille wing angle adjustment device. The rotation commands for each third outer grille wing include a third initial direction, a second rotation interval time, and a first rotation speed change condition. The second rotation interval time is the same for each third outer grille wing rotation command.

[0101] For each outer grille wing angle adjustment device, the outer grille wing angle adjustment device receives the corresponding third outer grille wing rotation command, which drives each outer grille wing connected to the outer grille wing angle adjustment device and each inner grille wing nested in each outer grille wing to rotate in the third initial direction at the rotation speed corresponding to the first rotation speed change condition, and changes direction according to the second rotation interval time.

[0102] The single random speed mode means that the outer grille wing 22 and the inner grille wing 21 of each row / column rotate at a speed corresponding to the first rotational speed variation condition at a fixed rotational interval. Therefore, the rotational speeds of each row / column may be the same or different, but the second rotational interval is the same.

[0103] The first rotational speed change condition characterizes the variation of the rotational speed, including the initial rotational speed and the form of rotational speed change. The form of rotational speed change can be a successive increase in rotational speed. For example, if the second rotation interval is 5 seconds, and the rotational speed increases by nm / s each time, assuming n is 1, and the initial rotational speed is 10 m / s, then the rotational speed for the first 5 seconds is 10 m / s, then the rotational speed for the next 10 seconds is 11 m / s, and the rotational speed for the next 15 seconds is 12 m / s.

[0104] Therefore, the main controller sends rotation commands for each third outer grid blade, including a third initial direction, a second rotation interval time, and a first rotation speed change condition, to the corresponding outer grid blade angle adjustment devices. It also sets the second rotation interval time included in each third outer grid blade rotation command to be the same. This causes each outer grid blade angle adjustment device to receive the corresponding third outer grid blade rotation command, driving each outer grid blade 22 connected to the outer grid blade angle adjustment device and each inner grid blade 21 nested within each outer grid blade to rotate in the third initial direction at the rotation speed corresponding to the first rotation speed change condition, and to change direction according to the second rotation interval time. This achieves the overall rotation of each row / column of outer grid blades 22 and inner grid blades 21 at the rotation speed corresponding to the first rotation speed change condition according to a fixed rotation interval time, thereby forming the corresponding turbulent field.

[0105] The fourth method:

[0106] When the rotation mode is the dual random mode, the main controller sends rotation commands for each fourth outer grille wing to the corresponding outer grille wing angle adjustment device. The fourth outer grille wing rotation commands include the fourth initial direction, the second rotation interval time change condition, and the second rotation speed change condition.

[0107] For each outer grille wing angle adjustment device, the outer grille wing angle adjustment device receives the corresponding fourth outer grille wing rotation command, which drives each outer grille wing connected to the outer grille wing angle adjustment device and each inner grille wing nested in each outer grille wing to rotate in the fourth initial direction at the rotation speed corresponding to the second rotation speed change condition, and to change direction according to the rotation interval time corresponding to the second rotation interval time change condition.

[0108] The dual-random mode means that the outer grille wing 22 and inner grille wing 21 of each row / column rotate as a whole in the fourth initial direction at the rotational speed corresponding to the second rotational speed change condition, and change direction according to the rotational interval time corresponding to the second rotational interval time change condition. Therefore, the second rotational interval time change condition for each row / column may be the same or different, and the second rotational speed change condition for each row / column may be the same or different. Specifically, the second rotational interval time change condition can be referred to in the description of the first rotational interval time change condition above, and the second rotational speed change condition can be referred to in the description of the first rotational speed change condition above, and will not be repeated here.

[0109] Therefore, the main controller sends rotation commands for each of the fourth outer grid vanes, including the fourth initial direction, the second rotation interval time change condition, and the second rotation speed change condition, to the corresponding outer grid vane angle adjustment devices. This causes each outer grid vane angle adjustment device to receive the corresponding fourth outer grid vane rotation command, thereby driving each outer grid vane 22 connected to the outer grid vane angle adjustment device and each inner grid vane 21 nested within each outer grid vane 22 to rotate in the fourth initial direction at the rotation speed corresponding to the second rotation speed change condition, and to change direction according to the rotation interval time corresponding to the second rotation interval time change condition. This achieves the overall rotation of each row / column of outer grid vanes 22 and inner grid vanes 21 at the rotation speed corresponding to the second rotation speed change condition and according to the rotation interval time corresponding to the second rotation interval time change condition, thereby forming the corresponding turbulent field.

[0110] As described above, the double-layer nested active turbulence grid system provided by this invention includes: a main controller, a grid frame 1, double-layer nested grid blades 2 arranged in an n-row, m-column cross pattern within the grid frame 1, and grid blade angle adjustment devices 3 installed outside the grid frame 1, each corresponding to one of the double-layer nested grid blades in each row and column, wherein n and m are both positive integers not less than 5; the grid blade angle adjustment device 3 includes an inner grid blade angle adjustment device and an outer grid blade angle adjustment device fixedly connected to the inner grid blade angle adjustment device via a motor connector 4, and both the inner and outer grid blade angle adjustment devices are communicatively connected to the main controller; the double-layer nested grid blades 2 include an outer grid... The inner grille wing 21 and the outer grille wing 22 are coaxially nested within the outer grille wing. The inner grille wing 21 in the same row / column are connected to the corresponding inner grille wing angle adjustment device through the same inner wing shaft 5. The outer grille wing 22 in the same row / column are connected to the corresponding outer grille wing angle adjustment device through the same outer wing shaft 6. The main controller controls each inner grille wing angle adjustment device to drive each inner grille wing 21 to rotate relative to each outer grille wing 22 in the target direction by a target angle through each inner wing shaft 5. Based on the control strategy, the main controller controls each outer grille wing angle adjustment device to drive each outer grille wing 22 through each outer wing shaft 6, and to drive each inner grille wing 21 to rotate according to the rotation mode corresponding to the control strategy through each motor connector 4. Therefore, by setting up a double-layer nested grid vane 2 including an inner grid vane 21 and an outer grid vane 22, and setting up a grid vane angle adjustment device 3 including an inner grid vane angle adjustment device and an outer grid vane angle adjustment device fixedly connected to the inner grid vane angle adjustment device via a motor connector 4, both the inner and outer grid vane angle adjustment devices are communicatively connected to the main controller. This allows for adjusting the relative angle between the inner grid vane 21 and the outer grid vane 22 via the inner grid vane angle adjustment device, changing the blockage degree of the double-layer nested grid vane 2, and adjusting the angle of the outer grid vane 22 via the outer grid vane angle adjustment device. This enables the overall movement of the inner and outer grid vanes 21 and 22, thereby forming a corresponding turbulent field. It is evident that the relative angle between the inner grid vane 21 and the outer grid vane 22 can be automatically changed by the main controller alone, further changing the blockage degree of the double-layer nested grid vane 2 in real time, without the need for manual replacement of the grid vanes. This enables real-time continuous control of the turbulent field, improving efficiency.

[0111] Furthermore, by adjusting the angle of the inner grid vane 21 through the inner grid vane angle adjustment device, the relative angle between the inner grid vane 21 and the outer grid vane 22 can be changed, thereby changing the blockage degree of the double-layer nested grid vane 2 relative to the incoming flow in real time. This enables the double-layer nested grid vane 2 to generate a turbulent field with a wide range of continuously adjustable turbulence parameters, solving the shortcomings of traditional active grids where the turbulence parameters can only be adjusted within a limited range. This makes it suitable for wind tunnels with open / semi-open test sections, improving the applicability of the double-layer nested active turbulence grid system.

[0112] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of one embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing the present invention.

[0113] Those skilled in the art will understand that the modules in the apparatus of the embodiments can be distributed in the apparatus of the embodiments as described in the embodiments, or they can be located in one or more devices different from this embodiment with corresponding changes. The modules of the above embodiments can be combined into one module, or they can be further divided into multiple sub-modules.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-layer nested active turbulence grid system, characterized in that, include: The system comprises a main controller, a grid frame, double-layered nested grid winglets arranged in a cross pattern of n rows and m columns within the grid frame, and grid winglet angle adjustment devices installed outside the grid frame that correspond one-to-one with the double-layered nested grid winglets in each row and column, wherein n and m are both positive integers not less than 5. The grid vane angle adjustment device includes an inner grid vane angle adjustment device and an outer grid vane angle adjustment device fixedly connected to the inner grid vane angle adjustment device via a motor connector. Both the inner and outer grid vane angle adjustment devices are communicatively connected to the main controller. The double-layer nested grid wing includes an outer grid wing and an inner grid wing coaxially nested within the outer grid wing. The inner grid wings in the same row / column are connected to the corresponding inner grid wing angle adjustment device through the same inner wing shaft, and the outer grid wings in the same row / column are connected to the corresponding outer grid wing angle adjustment device through the same outer wing shaft. The main controller controls the angle adjustment device of each inner grid blade to drive each inner grid blade to rotate relative to each outer grid blade by a target angle in the target direction through the shaft of each inner blade. The main controller controls each outer grille wing angle adjustment device to drive each outer grille wing through each outer wing shaft, and to drive each inner grille wing to rotate according to the rotation mode corresponding to the control strategy through each motor connector. The outer grid vane angle adjustment device includes a rotary motor, a first coupling and a motor support frame, and the inner grid vane angle adjustment device includes an angle motor, a second coupling, a slip ring and a slip ring support frame; The motor support frame is fixedly installed outside the grid frame, the rotary motor is fixedly installed on the motor support frame, the drive shaft of the rotary motor is a hollow shaft, one end of the drive shaft is fixedly connected to the outer blade shaft through the first coupling, the other end of the drive shaft is fixedly connected to the angle motor through the motor connector, and the input end of the rotary motor is connected to the main controller. The outer blade shaft is a hollow shaft. The inner blade shaft passes through the outer blade shaft and is connected to the output shaft of the angle motor through the second coupling located inside the motor connector. The input end of the angle motor is connected to one end of the slip ring that passes through the slip ring support frame. The other end of the slip ring is connected to the main controller. The slip ring support frame is fixedly installed on the motor support frame.

2. The double-layer nested active turbulence grid system as described in claim 1, characterized in that, The outer grille wing angle adjustment device also includes a rotary bearing and a retaining ring; The rotary bearing is sleeved on the outer periphery of the outer blade shaft, and the retaining ring presses the rotary bearing against the outside of the grid frame.

3. The double-layer nested active turbulence grid system as described in claim 1, characterized in that, It also includes rotary motor drivers and angle motor drivers; The input end of the rotary motor is connected to the main controller via the rotary motor driver, and the other end of the slip ring is connected to the main controller via the angle motor driver.

4. The double-layer nested active turbulence grid system as described in claim 1, characterized in that, Each inner grid wing in the same row / column is provided with an inner wing shaft hole that is interconnected with each inner grid wing, and each inner grid wing is fixedly connected to the inner wing shaft provided in the inner wing shaft hole.

5. The double-layer nested active turbulence grid system as described in claim 1, characterized in that, When the rotation mode is fixed speed mode, the main controller sends rotation commands for each first outer grille wing to the corresponding outer grille wing angle adjustment device. The first outer grille wing rotation command includes a first initial direction, a first rotation speed and a first rotation interval time, and the first rotation speed included in each first outer grille wing rotation command is the same. For each outer grille wing angle adjustment device, the outer grille wing angle adjustment device receives the corresponding first outer grille wing rotation command, which drives each outer grille wing connected to the outer grille wing angle adjustment device and each inner grille wing nested in each outer grille wing to rotate in the first initial direction at the first rotation speed, and to change direction according to the first rotation interval time.

6. The double-layer nested active turbulence grid system as described in claim 1, characterized in that, When the rotation mode is a time-random mode, the main controller sends rotation commands for each second outer grille wing to the corresponding outer grille wing angle adjustment device. The second outer grille wing rotation command includes a second initial direction, a second rotation speed, and a first rotation interval time change condition. The second rotation speed included in each second outer grille wing rotation command is the same. For each outer grille wing angle adjustment device, the outer grille wing angle adjustment device receives the corresponding second outer grille wing rotation command, which drives each outer grille wing connected to the outer grille wing angle adjustment device and each inner grille wing nested in each outer grille wing to rotate in the second initial direction at the second rotation speed, and to change direction according to the rotation interval time corresponding to the first rotation interval time change condition.

7. The double-layer nested active turbulence grid system as described in claim 1, characterized in that, When the rotation mode is the speed single random mode, the main controller sends rotation commands for each third outer grille wing to the corresponding outer grille wing angle adjustment device. The rotation commands for each third outer grille wing include a third initial direction, a second rotation interval time, and a first rotation speed change condition. The second rotation interval time included in each third outer grille wing rotation command is the same. For each outer grille wing angle adjustment device, the outer grille wing angle adjustment device receives the corresponding third outer grille wing rotation command, which drives each outer grille wing connected to the outer grille wing angle adjustment device and each inner grille wing nested in each outer grille wing to rotate in the third initial direction at the rotation speed corresponding to the first rotation speed change condition, and changes direction according to the second rotation interval time.

8. The double-layer nested active turbulence grid system as described in claim 1, characterized in that, When the rotation mode is the dual random mode, the main controller sends rotation commands for each fourth outer grille wing to the corresponding outer grille wing angle adjustment device. The rotation commands for the fourth outer grille wing include a fourth initial direction, a second rotation interval time change condition, and a second rotation speed change condition. For each outer grille wing angle adjustment device, the outer grille wing angle adjustment device receives the corresponding fourth outer grille wing rotation command, which drives each outer grille wing connected to the outer grille wing angle adjustment device and each inner grille wing nested in each outer grille wing to rotate in the fourth initial direction at the rotation speed corresponding to the second rotation speed change condition, and to change direction according to the rotation interval time corresponding to the second rotation interval time change condition.

9. The double-layer nested active turbulence grid system as described in claim 1, characterized in that, The target angle range is 0-90°.

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