Cascade cooperative distributed control complex wind field generation system and complex wind field construction method

Abstract

The invention discloses a cascade cooperative distributed control complex wind field generation system and a complex wind field construction method, and belongs to the technical field of wind tunnel test research. The wind tunnel body comprises a first diffusion section, a first corner section, a second diffusion section, a second corner section, a first power system, a third diffusion section, a third corner section, a heat exchanger, a fourth corner section, a stable section and a contraction section which are arranged in sequence; the outlet end of the contraction section is provided with a global complex wind field generation device capable of adjusting the airflow generation mode, the airflow velocity, the airflow jet direction, the airflow swing frequency and the airflow swing amplitude, and the inlet end of the first diffusion section is provided with a collector. On the basis of a uniform flow field of a conventional backflow type low-speed wind tunnel, an unsteady complex wind field can be stacked, a complex flow field with the flight speed coupled with the unsteady wind field is achieved, and the device is used for simulating the application scene that an aircraft passes through the complex wind field in the flight process.

Description

Technical Field

[0001] This invention belongs to the field of wind tunnel test research technology. Specifically, it relates to a complex wind field generation system and a method for constructing complex wind fields with cascaded cooperative distributed control. Background Technology

[0002] Shear winds, crosswinds, gusts, downbursts, urban heat island winds, and canyon winds are common complex flow phenomena in the low-altitude atmospheric environment. They are characterized by high suddenness, unpredictability, short duration, high wind force, complex flow field structure, strong unsteadiness, and high turbulence, significantly impacting the flight performance, flight quality, control, and flight safety of aircraft traversing them. Accurate simulation of complex wind fields to understand their impact on aircraft is fundamental and crucial for aircraft design, development, airworthiness certification, and flight safety assurance.

[0003] Currently, most laboratory physical simulations of the aforementioned complex wind fields are based on characteristic parameterized mathematical models of the physical properties of natural wind fields, employing single-sided or multi-sided fan (turbine) array walls and grid wall combinations in different directions. For example, the low-altitude aircraft wind tunnel at the Guangzhou Aerospace Science and Technology Research Institute uses a single-sided 8×6 fan array wall to simulate uniform normal wind, gusts, and shear wind. The three-dimensional multiphysics wind tunnel at the Shenzhen Institute of Advanced Research, University of Electronic Science and Technology of China, uses a single-sided fan array to simulate normal wind, shear wind, and gusts, and uses a combination of multiple fan arrays to simulate downbursts and tornadoes. Multi-fan array wind tunnels at Tongji University in China and Miyazaki University in Japan use multiple fan arrays to simulate normal wind and pulsating wind. The WindEEE Dome wind tunnel at Western University in Canada uses a combination of multiple fan arrays in different directions to simulate tornadoes and downbursts. The IBHS Research Center in the United States uses multi-fan arrays to simulate typhoon wind fields.

[0004] It is worth noting that while the technical facilities and wind farm components listed above can effectively construct various types of complex wind farms, their application scenarios are mostly limited to hovering or stationary aircraft because almost none of them can simulate the effects of aircraft flight speed. In other words, the current methods and technologies for simulating complex wind farms have limited simulation and application capabilities. Summary of the Invention

[0005] The purpose of this invention is to provide a complex wind field generation system and a complex wind field construction method based on cascaded collaborative distributed control. By connecting a full-domain complex wind field generation device with adjustable airflow generation mode, airflow velocity, airflow jet direction, airflow oscillation frequency, and airflow oscillation amplitude in series on the basis of a first power system, an unsteady complex wind field can be superimposed on the uniform flow field of a conventional recirculating low-speed wind tunnel to realize a complex flow field coupled with flight speed and unsteady wind field, which is used to simulate the application scenario of an aircraft passing through the above-mentioned complex wind field during flight.

[0006] To achieve the objective of this invention, the technical solution adopted is as follows: a complex wind field generation system with cascaded collaborative distributed control, comprising a wind tunnel body in the shape of a U-shape, and the wind tunnel body comprising a first diffusion section, a first corner section, a second diffusion section, a second corner section, a first power system, a third diffusion section, a third corner section, a heat exchanger, a fourth corner section, a stabilization section, and a contraction section arranged sequentially; the outlet end of the contraction section is equipped with a full-domain complex wind field generation device that can adjust the airflow generation mode, airflow velocity, airflow jet direction, airflow oscillation frequency, and airflow oscillation amplitude, and a collector is installed at the inlet end of the first diffusion section.

[0007] There is a certain distance between the outlet end of the complex wind field generator and the inlet end of the collector.

[0008] Furthermore, the all-domain complex wind field generating device includes a second power system and an omnidirectional rectangular nozzle array arranged sequentially at the outlet end of the contraction section; the omnidirectional rectangular nozzle array includes nozzle modules covering the outlet end of the second power system, and the nozzle modules are provided with blades that divide their interior into multiple channels, and the blades can swing within the nozzle modules.

[0009] Furthermore, the full-domain complex wind field generating device also includes a compensation section connected between the contraction section and the second power system.

[0010] Furthermore, the nozzle module contains four blades, which are arranged in a cross shape within the nozzle module.

[0011] Furthermore, the blade has a streamlined airfoil-shaped cross-section.

[0012] Furthermore, the second power system includes a fan array housing connected to the outlet end of the compensation section and multiple variable frequency axial flow fans distributed within the housing.

[0013] Furthermore, the multiple variable frequency axial flow fans are arranged in a rectangular array at the outlet end of the compensation section, and the multiple nozzle modules are arranged in a rectangular array at the outlet end of the multiple variable frequency axial flow fans.

[0014] Furthermore, one nozzle module corresponds to four variable frequency axial flow fans.

[0015] Furthermore, a power section front section is also connected between the first power system and the second corner section.

[0016] Furthermore, the first power system consists of one or more high-power variable frequency axial flow fans distributed at the outlet end of the front section of the power section.

[0017] Furthermore, the variable frequency axial flow fan includes an air inlet shroud, a pressurization section, and an exhaust shroud connected in sequence. A rectifier head cover is installed at the center of the air inlet shroud, and a rectifier tail cover is installed inside the exhaust shroud. A variable frequency motor is installed inside the rectifier tail cover, and a rotating impeller is installed at the output end of the variable frequency motor. Multiple anti-rotation plates are evenly spaced along the circumference of the rectifier tail cover and the inner wall of the pressurization section.

[0018] Furthermore, the inlet end of the air intake hood and the outlet end of the exhaust hood are both rectangular, and the outlet end of the air intake hood and the inlet end of the exhaust hood are both circular.

[0019] Furthermore, the side view formed by the fairing, pressurization section, and fairing tail section together has a streamlined airfoil shape.

[0020] Furthermore, a heat exchanger front section is connected between the heat exchanger and the third corner section, and a heat exchanger rear section is connected between the heat exchanger and the fourth corner section.

[0021] Furthermore, a honeycomb device and a damping net are installed in the stabilizing section, and corner guide vanes are provided in the first corner section, the second corner section, the third corner section and the fourth corner section.

[0022] A method for constructing complex wind farms using cascade cooperative distributed control, comprising the complex wind farm generation system described above, and further comprising the following steps:

[0023] Step S1: Determine the simulated flow field;

[0024] Step S2: Based on the simulated flow field characteristics, determine and adjust the operating frequency of the variable frequency axial flow fan in the first power system; determine whether the complex wind field generator should be installed and disassemble it; determine the operating mode and operating frequency of multiple variable frequency axial flow fans in the second power system; determine the blades that need to swing within the omnidirectional rectangular nozzle array based on the simulated flow field characteristics, determine the swing direction, swing frequency, and swing amplitude of the blades, and adjust them.

[0025] Furthermore, during the simulation of a uniform and stable flow field, the variable frequency axial flow fan in the first power system operates at the same frequency, the omnidirectional rectangular nozzle array and the second power system in the global complex wind field generator are removed, or the second power system in the global complex wind field generator is not running and the blades in the omnidirectional rectangular nozzle array do not oscillate.

[0026] Furthermore, when simulating the flow field by superimposing the flight speed with the shear wind field or the flight speed with the downburst or heat island wind field, the variable frequency axial flow fans in the first power system operate at the same frequency, and the variable frequency axial flow fans in the second power system are layered. The variable frequency axial flow fans in the same layer of the second power system operate at the same frequency, and the variable frequency axial flow fans in different layers of the second power system operate at different frequencies. The blades arranged horizontally in each nozzle module are adjusted for deflection, or the blades arranged vertically in each nozzle module are adjusted for deflection.

[0027] Furthermore, when simulating the flow field of flight speed superimposed with shear wind field with different turbulence characteristics, the frequency of the variable frequency axial flow fan in the second power system is adjusted based on the flow field simulation of flight speed superimposed with shear wind field or flight speed superimposed with storm flow or heat island wind field.

[0028] Furthermore, in the flow field simulation of the superimposed gust wind field on the flight speed, the variable frequency axial flow fans in the first and second power systems operate at the same frequency, adjusting the horizontally arranged blades in each nozzle module to deflect at different frequencies and swing at different amplitudes, or adjusting the vertically arranged blades in each nozzle module to deflect at different frequencies and swing at different amplitudes.

[0029] The beneficial effects of this invention are:

[0030] (1) The cascade collaborative distributed control method for constructing complex wind fields provided by the present invention empowers the air through the first power system. While ensuring the uniformity of pressure and velocity at the inflow section of the second power system, it can change the inflow velocity and pressure, providing a key foundation for the simulation of aircraft flight speed. Through the variable frequency axial flow fans arranged in a rectangular array in the second power system, and through the distributed collaborative control of the rotation speed of the variable frequency axial flow fans, the second power system can realize the simulation of uniform flow velocity, gradient stratification, and any required distribution form, thereby realizing the simulation of normal stable flow field, wind field, and shear wind field superimposed with flight speed. Through the collaborative control of the oscillation of the blades in the second power system and the nozzle module, the simulation of downburst and heat island wind field effects can be realized. Through the oscillation control of the blades in the nozzle module, the simulation of gusts, time-varying winds, and their impact on the flight performance of the aircraft can be realized.

[0031] (2) Compared with existing wind field simulation methods and technologies, the present invention can simulate more types of wind fields. In particular, it realizes the fine simulation of complex wind field effects superimposed on flight speed, which makes the test and application scenarios and value leap forward and the application field significantly expands. Attached Figure Description

[0032] The accompanying drawings illustrate exemplary embodiments of the invention and, together with the description thereof, serve to explain the principles of the invention. These drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification.

[0033] Figure 1 This is a structural diagram of a complex wind field generation system and a complex wind field construction method with cascaded collaborative distributed control.

[0034] Figure 2 This is a structural diagram of a complex wind field generator covering the entire area;

[0035] Figure 3 This is a side view of a complex wind field generator covering the entire area;

[0036] Figure 4 This is a structural diagram of the second power system;

[0037] Figure 5 This is a side view of the second power system;

[0038] Figure 6 This is a magnified view of a portion of the second power system;

[0039] Figure 7 This is a structural diagram of a variable frequency axial flow fan;

[0040] Figure 8 This is a structural diagram of an omnidirectional rectangular nozzle array;

[0041] Figure 9 This is a schematic diagram of the blade installation inside the nozzle module.

[0042] The attached diagram shows the markings and corresponding component names:

[0043] 1. Full-area complex wind field generating device; 3. Collector; 7. First diffusion section; 8. First corner section; 9. Second diffusion section; 10. Second corner section; 11. Front section of power section; 12. First power system; 13. Third diffusion section; 14. Third corner section; 15. Front section of heat exchanger; 16. Heat exchanger; 17. Rear section of heat exchanger; 18. Fourth corner section; 19. Stabilization section; 20. Contraction section.

[0044] 1-1 Compensation section; 1-2 Second power system; 1-3 Omnidirectional rectangular nozzle array;

[0045] 1-2-1, Fan array housing; 1-2-2, Variable frequency axial flow fan;

[0046] 1-2-2-1, Intake shroud; 1-2-2-2, Rectifier head shroud; 1-2-2-3, Rotating impeller; 1-2-2-4, Anti-rotation vane; 1-2-2-5, Booster section; 1-2-2-6, Rectifier tail shroud; 1-2-2-7, Exhaust shroud.

[0047] 1-3-1, Nozzle module; 1-3-2, Blades. Detailed Implementation

[0048] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present invention are shown in the accompanying drawings.

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other. The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0050] like Figure 1 As shown, the present invention provides a complex wind field generation system with cascaded cooperative distributed control, including a wind tunnel body, which comprises a first diffuser section 7, a first corner section 8, a second diffuser section 9, a second corner section 10, a first power system 12, a third diffuser section 13, a third corner section 14, a heat exchanger 16, a fourth corner section 18, a stabilizing section 19, and a contraction section 20 arranged sequentially. The opening sizes of the inlet ends of the first diffuser section 7, the second diffuser section 9, and the third diffuser section 13 are all smaller than the outlet ends of the first diffuser section 7, the second diffuser section 9, and the third diffuser section 13. The opening size at the outlet end of the contraction section 20 is larger than the opening size at the outlet end of the contraction section 20; while in the first corner section 8, the second corner section 10, the first power system 12, the third corner section 14, the heat exchanger 16, the fourth corner section 18, and the stabilizing section 19, the opening size at the inlet end is equal to the opening size at the outlet end; the end faces of the first diffusion section 7, the first corner section 8, the second diffusion section 9, the second corner section 10, the first power system 12, the third diffusion section 13, the third corner section 14, the heat exchanger 16, the fourth corner section 18, the stabilizing section 19, and the contraction section 20 are all rectangular.

[0051] At the outlet end of the contraction section 20, a global complex wind field generating device 1 is installed. The global complex wind field generating device 1 can adjust the air flow generation mode, air flow velocity, air flow injection direction, air flow swing frequency, and air flow swing amplitude. At the same time, a collector 3 is also installed at the inlet end of the first diffuser section 7. After the global complex wind field generating device 1 and the collector 3 are installed, there is a certain distance between the outlet end of the global complex wind field generating device 1 and the inlet end of the collector 3, and the size of this distance can be determined according to the wind tunnel design principles and methods. By setting a certain distance between the outlet end of the global complex wind field generating device 1 and the inlet end of the collector 3, a state of complex wind field open test is formed, making the space between the outlet end of the global complex wind field generating device 1 and the inlet end of the collector 3 an open space without upper, lower, left, or right wall plate restrictions, and the air flow is in an air flow state between the outlet end of the global complex wind field generating device 1 and the inlet end of the collector 3.

[0052] Through the joint cooperation of the first diffuser section 7, the first turning section 8, the second diffuser section 9, the second turning section 10, the first power system 12, the third diffuser section 13, the third turning section 14, the heat exchanger 16, the fourth turning section 18, the stabilization section 19, the contraction section 20, the global complex wind field generating device 1 and the collector 3, the wind tunnel body is in a shape of a double - loop.

[0053] Through the joint cooperation of the first power system 12 and the global complex wind field generating device 1, the present invention can form an artificially controllable uniform and stable flow field between the outlet end of the global complex wind field generating device 1 and the inlet end of the collector 3. According to the relative motion principle, aerodynamic - related tests of an aircraft flying in a static atmospheric environment or related tests of an aircraft encountering a complex wind field during flight can be carried out.

[0054] At the same time, in this embodiment, the opening size of the inlet end of the global complex wind field generating device 1 is equal to the opening size of the outlet end of the global complex wind field generating device 1, and the opening size of the inlet end of the collector 3 is larger than the opening size of the outlet end of the collector 3, making the inlet end of the collector 3 the air flow collection port for collecting and guiding the air flow into the first diffuser section 7.

[0055] In this embodiment, as Figure 2 、 Figure 3 、 Figure 8 、 Figure 9As shown, the all-area complex wind field generating device 1 includes a compensation section 1-1, a second power system 1-2, and an omnidirectional rectangular nozzle array 1-3 connected in sequence. The compensation section 1-1 is connected between the second power system 1-2 and the contraction section 20. The omnidirectional rectangular nozzle array 1-3 includes multiple nozzle modules 1-3-1 in the shape of rectangular channels. The inlet ends of the multiple nozzle modules 1-3-1 cover the outlet ends of the second power system 1-2, so that the airflow delivered by the second power system 1-2 enters each nozzle module 1-3-1 respectively. Within -3-1; simultaneously, each nozzle module 1-3-1 is equipped with multiple blades 1-3-2, the length direction of the blades 1-3-2 is consistent with the length direction of the nozzle module 1-3-1, and the width of the nozzle module 1-3-1 extends outward from the central axis of the nozzle module 1-3-1, and the multiple blades 1-3-2 divide the nozzle module 1-3-1 into multiple small channels, the axial direction of each small channel is uniform and consistent with the axial direction of the nozzle module 1-3-1. In this embodiment, the blade 1-3-2 can oscillate within the nozzle module 1-3-1. This oscillation guides the airflow from the second power system 1-2, causing the airflow delivered through the omnidirectional rectangular nozzle array 1-3 to tilt relative to the direction of the airflow from the second power system 1-2. This adjusts the flow direction of the airflow from the second power system 1-2. The oscillation of the blade 1-3-2 can simulate complex flow fields such as downbursts, heat island effects, crosswinds, and gusts. Of course, in this embodiment, when the blade 1-3-2 in the nozzle module 1-3-1 is not oscillating, the direction of the airflow delivered by the omnidirectional rectangular nozzle array 1-3 is consistent with the axial direction of the omnidirectional rectangular nozzle array 1-3.

[0056] In this embodiment, the number of blades 1-3-2 and their arrangement within each nozzle module 1-3-1 can be determined according to actual conditions. Specifically, the number of blades 1-3-2 within the nozzle module 1-3-1 can be one, two, three, four, etc., and the arrangement of the blades 1-3-2 within the nozzle module 1-3-1 can be determined as needed, ensuring that the spanwise direction of the blades 1-3-2 is aligned with the vertical direction and / or the horizontal direction. When the spanwise direction of the blades 1-3-2 is aligned with the vertical direction, the width of the blades 1-3-2 is slightly less than the height of the internal channel of the nozzle module 1-3-1, or slightly less than half the height of the internal channel of the nozzle module 1-3-1. When the spanwise direction of the blades 1-3-2 is aligned with the horizontal direction, the width of the blades 1-3-2 is slightly less than the width of the internal channel of the nozzle module 1-3-1, or slightly less than half the width of the internal channel of the nozzle module 1-3-1. It should be noted that, in this invention, the spanwise direction of blade 1-3-2 is the straight line direction from one side of blade 1-3-2 to the other side of blade 1-3-2.

[0057] It should be noted that the spanwise direction of blade 1-3-2 in this invention is not the thickness direction of blade 1-3-2, but rather a straight line from one side of blade 1-3-2 to the other side. Of course, in this embodiment, the arrangement of blade 1-3-2 in the nozzle module 1-3-1 can be adjusted as needed. One side of blade 1-3-2 can be positioned on the inner wall of the nozzle module 1-3-1, and the other side of blade 1-3-2 can extend towards the central axis of the nozzle module 1-3-1. That is, as needed, multiple blades 1-3-2 can be arranged in an "X", "+", or "M" shape within the nozzle module 1-3-1.

[0058] Taking blades 1-3-2 as an example (either one or four), the direction of airflow delivered by nozzle module 1-3-1 is explained as follows:

[0059] When there is only one blade 1-3-2 in the nozzle module 1-3-1, the span of blade 1-3-2 can be consistent with the horizontal direction or the vertical direction. At this time, when blade 1-3-2 swings, it can only guide the airflow delivered by the second power system 1-2 to tilt to the left or right, or it can only guide the airflow delivered by the second power system 1-2 to tilt upward or downward. At this time, the width of blade 1-3-2 is slightly smaller than the height of the internal channel of nozzle module 1-3-1, or the width of blade 1-3-2 is slightly smaller than the width of the internal channel of nozzle module 1-3-1.

[0060] When there are four blades 1-3-2 in the nozzle module 1-3-1, the four blades 1-3-2 can be arranged in a "+" or "X" shape within the nozzle module 1-3-1. When the four blades 1-3-2 are arranged in a "+" shape within the nozzle module 1-3-1, and two blades 1-3-2 located on the same vertical plane swing, they guide the airflow delivered by the second power system 1-2 to tilt to the left or right. When two blades 1-3-2 located on the same horizontal plane swing, they guide the airflow delivered by the second power system 1-2 to tilt upward or downward. That is, when the four blades 1-3-2 in the nozzle module 1-3-1 are arranged in a cross shape, the airflow delivered by the nozzle module 1-3-1 can tilt upward, downward, left, or right as needed.

[0061] In this embodiment, as Figure 9As shown, the cross-section of the blade 1-3-2 inside the nozzle module 1-3-1 is a streamlined airfoil, which makes the airflow smoother when passing through the nozzle module 1-3-1 and avoids flow separation as much as possible within the omnidirectional rectangular nozzle array 1-3. At the same time, in this embodiment, each blade 1-3-2 inside the nozzle module 1-3-1 is independently controlled, so that a time-varying wind field can be achieved by controlling the swing amplitude and swing frequency of the blade 1-3-2 during wind tunnel testing. In order to meet the individual drive of the blade 1-3-2, when installing the blade 1-3-2, the end of the blade 1-3-2 near the second power system 1-2 can be rotatably mounted on the inner wall of the nozzle module 1-3-1 via a hinge shaft, and a variable frequency motor for driving the rotation of the blade 1-3-2 is installed on the outer wall of the nozzle module 1-3-1. The output end of the variable frequency motor is connected to the hinge shaft on the blade 1-3-2.

[0062] In this embodiment, Figure 4 , Figure 5 , Figure 6 As shown, the second power system 1-2 includes a fan array housing 1-2-1 connected to the outlet end of the compensation section 1-1, and multiple variable frequency axial flow fans 1-2-2 are arranged inside the fan array housing 1-2-1. The variable frequency axial flow fans 1-2-2 can convert electrical energy into mechanical energy, and then into the pressure energy required by the wind tunnel body. Each variable frequency axial flow fan 1-2-2 is individually controlled, so that the rotation speed of each variable frequency axial flow fan 1-2-2 can energize the incoming airflow to achieve the regulation of airflow pressure and velocity. This allows the second power system 1-2 to simulate airflow with uniform velocity, gradient stratification, and any desired distribution form, for simulation of normal stable flow fields, complex wind fields, and shear wind fields with complex wind fields superimposed on flight speed. At the same time, each variable frequency axial flow fan 1-2-2 corresponds to a small channel in the nozzle module 1-3-1, so that the airflow delivered by each variable frequency axial flow fan 1-2-2 can be guided by at least one blade 1-3-2. Of course, while ensuring the airflow delivered by the second power system 1-2 is guided, one channel of the nozzle module 1-3-1 can also correspond to multiple variable frequency axial flow fans 1-2-2.

[0063] In this embodiment, multiple variable frequency axial flow fans 1-2-2 are arranged in a rectangular array within the fan array housing 1-2-1, and multiple nozzle modules 1-3-1 are also arranged in a rectangular array at the outlet end of the fan array housing 1-2-1. In order to form multiple nozzle modules 1-3-1, during the processing of the omnidirectional rectangular nozzle array 1-3, a rectangular housing with the same opening size as the fan array housing 1-2-1 can be used first. Then, a grid made of thin steel plate is fixedly installed inside the rectangular housing. The grid forms multiple rectangular channels inside the rectangular housing. At this time, each rectangular channel is a nozzle module 1-3-1.

[0064] When there are four blades 1-3-2 in the nozzle module 1-3-1, and the four blades 1-3-2 are arranged in a cross shape, the inside of the nozzle module 1-3-1 is divided into four small channels. When each variable frequency axial flow fan 1-2-2 corresponds to one small channel in the nozzle module 1-3-1, one nozzle module 1-3-1 corresponds to four variable frequency axial flow fans 1-2-2.

[0065] In this embodiment, as Figure 7 As shown, the variable frequency axial flow fan 1-2-2 includes an inlet hood 1-2-2-1, a booster section 1-2-2-5, and an exhaust hood 1-2-2-7 connected in sequence. The inlet end of the inlet hood 1-2-2-1 is connected to the outlet end of the contraction section 20. The opening size of the inlet end of the inlet hood 1-2-2-1 is larger than the opening size of the outlet end of the inlet hood 1-2-2-1. The opening size of the inlet end of the booster section 1-2-2-5 is equal to the opening size of the outlet end of the booster section 1-2-2-5, the opening size of the outlet end of the inlet hood 1-2-2-1, and the opening size of the inlet end of the exhaust hood 1-2-2-7. The size of the outlet end of the exhaust hood 1-2-2-7 is equal to the size of the inlet end of the inlet hood 1-2-2-1. A rectifier head cover 1-2-2-2 is installed in the center of the air intake shroud 1-2-2-1, and the front end of the rectifier head cover 1-2-2-2 does not extend beyond the inlet end of the air intake shroud 1-2-2-1; a rectifier tail cover 1-2-2-6 is installed inside the exhaust shroud 1-2-2-7, and the rear end of the rectifier tail cover 1-2-2-6 does not extend beyond the outlet end of the exhaust shroud 1-2-2-7.

[0066] A variable frequency motor is also installed inside the rectifier tail cover 1-2-2-6. A rotating impeller 1-2-2-3 is installed at the output end of the variable frequency motor. The rotating impeller 1-2-2-3 is located between the rectifier head cover 1-2-2-2 and the rectifier tail cover 1-2-2-6. The two ends of the cylindrical surface of the rotating impeller 1-2-2-3 are respectively connected to the rectifier head cover 1-2-2-2 and the rectifier tail cover 1-2-2-6. The rectifier head cover 1-2-2-2 and the rotating impeller 1-2-2... One end of the cylindrical surface of the -3 is seamlessly connected, and the other end of the cylindrical surface of the rotating impeller 1-2-2-3 has a gap of no more than 2mm between it and the rectifier tail cover 1-2-2-6. This ensures that the rotating impeller 1-2-2-3 rotates normally while minimizing the airflow from entering the interior of the cylindrical surface of the rotating impeller 1-2-2-3 through the gap between the cylindrical end of the rotating impeller 1-2-2-3 and the rectifier head cover 1-2-2-2 and the rectifier tail cover 1-2-2-6.

[0067] Meanwhile, multiple fan blades on the rotating impeller 1-2-2-3 are located at the end of the rotating impeller 1-2-2-3 near the rectifier head cover 1-2-2-2, and the multiple fan blades on the rotating impeller 1-2-2-3 are evenly spaced along the circumference on the cylindrical surface of the rotating impeller 1-2-2-3; at the same time, multiple anti-rotation plates 1-2-2-4 are also installed at the end of the rectifier tail cover 1-2-2-6 near the rotating impeller 1-2-2-3. The rectifier tail cover 1-2-2-6 is evenly spaced around its circumference, and the extended ends of multiple anti-rotation plates 1-2-2-4 are fixed to the inner wall of the pressurization section 1-2-2-5. The other ends of the multiple anti-rotation plates 1-2-2-4 are fixed to the rectifier tail cover 1-2-2-6. This allows the anti-rotation plates 1-2-2-4 to not only guide the rotating airflow generated by the rotating impeller, but also to fix and support the rectifier tail cover 1-2-2-6 on the central axis inside the pressurization section 1-2-2-5.

[0068] In this embodiment, the airfoil, number, and spacing between adjacent blades on the rotating impeller 1-2-2-3 of the rectifier fan are all determined through rigorous aerodynamic design. Similarly, the airfoil, number, and spacing between adjacent anti-rotation blades 1-2-2-4 are also determined through rigorous aerodynamic design. Specifically, the side view formed by the rectifier head cover 1-2-2-2, the pressurization section 1-2-2-5, and the rectifier tail cover 1-2-2-6 exhibits a streamlined airfoil.

[0069] In this embodiment, to avoid gaps between the inlet ends of two adjacent variable frequency axial flow fans 1-2-2 and between the outlet ends of two adjacent variable frequency axial flow fans 1-2-2 when multiple variable frequency axial flow fans 1-2-2 are installed in an array, the inlet end of the air intake hood 1-2-2-1 and the outlet end of the exhaust hood 1-2-2-7 are both rectangular, the pressurization section 1-2-2-5 is cylindrical, and the outlet end of the air intake hood 1-2-2-1 and the inlet end of the exhaust hood 1-2-2-7 are both circular, so that the airflow flowing through the second power system 1-2 undergoes strict rectification.

[0070] In this embodiment, as Figure 1 As shown, a power section front section 11 is also connected between the first power system 12 and the second corner section 10. The first power system 12 consists of one or more high-power variable frequency axial flow fans 1-2-2 at the outlet end of the power section front section 11. The structure of the variable frequency axial flow fan 1-2-2 is similar to that of the variable frequency axial flow fan 1-2-2 in the second power system 1-2. The variable frequency axial flow fan 1-2-2 in the first power system 12 enables the air to flow along the wind tunnel body.

[0071] When there is only one variable frequency axial flow fan 1-2-2 in the first power system 12, the opening shape and size of the inlet end of the air inlet hood 1-2-2-1 of the variable frequency axial flow fan 1-2-2 are consistent with the opening shape and size of the outlet end of the front section 11 of the power section, so that the inlet end of the air inlet hood 1-2-2-1 of the variable frequency axial flow fan 1-2-2 is connected to the outlet end of the front section 11 of the power section, and the opening shape and size of the outlet end of the air inlet hood 1-2-2-1 of the variable frequency axial flow fan 1-2-2 are consistent with the opening shape and size of the inlet end of the third diffuser section 13, and the outlet end of the exhaust hood 1-2-2-7 of the variable frequency axial flow fan 1-2-2 is connected to the inlet end of the third diffuser section 13.

[0072] When there are multiple variable frequency axial flow fans 1-2-2 in the first power system 12, the multiple variable frequency axial flow fans 1-2-2 are arranged in a rectangular array. At this time, the structure of the first power system 12 is completely similar to the structure of the second power system 1-2. Moreover, the opening shape and size of the inlet end of the fan array housing 1-2-1 in the first power system 12 are consistent with the opening shape and size of the outlet end of the front section 11 of the power section, and the opening shape and size of the outlet end of the fan array housing 1-2-1 in the first power system 12 are consistent with the opening shape and size of the inlet end of the third diffuser section 13. It should be noted that when there are multiple variable frequency axial flow fans 1-2-2 in the first power system 12, all variable frequency axial flow fans 1-2-2 must maintain the same frequency operation.

[0073] In this embodiment, in order to prevent the mechanical vibration of the first power system 12 from being transmitted to the wind tunnel body through the upstream power section front section 11 and the downstream third diffusion section 13, a flexible connection structure is adopted between the first power system 12 and the outlet end of the upstream power section front section 11 and the inlet end of the downstream third diffusion section 13.

[0074] In this embodiment, as Figure 1 As shown, a heat exchanger front section 15 is connected between heat exchanger 16 and the third corner section 14, and a heat exchanger rear section 17 is connected between heat exchanger 16 and the fourth corner section 18. A honeycomb device and a damping screen are installed in the stabilizing section 19. Corner guide vanes are provided in the first corner section 8, the second corner section 10, the third corner section 14 and the fourth corner section 18.

[0075] Based on the aforementioned complex wind field generation system with cascade cooperative distributed control, this embodiment also provides a method for constructing complex wind fields with cascade cooperative distributed control, specifically including the following steps:

[0076] Step S1: Determine the simulated flow field according to the needs of the experiment;

[0077] Step S2: Based on the simulated flow field characteristics, determine the operating frequency of the variable frequency axial flow fan 1-2-2 in the first power system 12, and adjust it accordingly; determine whether the all-domain complex wind field generator 1 is installed. If it is determined that the all-domain complex wind field generator 1 does not need to be installed, it can be directly removed from the contraction section 20. If it is determined that the all-domain complex wind field generator 1 needs to be installed, first connect the inlet end of the compensation section to the outlet end of the contraction section 20, then connect the outlet end of the compensation section to the inlet end of the second power system 1-2, and then connect the outlet end of the second power system 1-2 to the inlet end of the omnidirectional rectangular nozzle array 1-3; determine the operating mode and operating frequency of the multiple variable frequency axial flow fans 1-2-2 in the second power system 1-2, and adjust them accordingly; based on the simulated flow field characteristics, determine the blades 1-3-2 that need to swing within the omnidirectional rectangular nozzle array 1-3, determine the swing direction, swing frequency, and swing amplitude of the blades 1-3-2, and adjust them accordingly.

[0078] The specific simulation methods for different flow fields are as follows:

[0079] During the uniform and stable flow field simulation, the variable frequency axial flow fan 1-2-2 in the first power system 12 operates at the same frequency, and the omnidirectional rectangular nozzle array 1-3 and the second power system 1-2 in the global complex wind field generator 1 are removed, or the second power system 1-2 in the global complex wind field generator 1 is not running and the blades 1-3-2 in the omnidirectional rectangular nozzle array 1-3 do not oscillate.

[0080] When simulating the flow field of flight speed superimposed with shear wind field and flight speed superimposed with downburst, or when simulating the flow field of flight speed superimposed with shear wind field and heat island wind field, the variable frequency axial flow fans 1-2-2 in the first power system 12 operate at the same frequency, and the variable frequency axial flow fans 1-2-2 in the second power system 1-2 are layered, with the variable frequency axial flow fans 1-2-2 in the same layer of the second power system 1-2 operating at the same frequency, and the variable frequency axial flow fans 1-2-2 in different layers of the second power system 1-2 operating at different frequencies; the blades 1-3-2 arranged horizontally in each nozzle module 1-3-1 are adjusted to deflect, or the blades 1-3-2 arranged vertically in each nozzle module 1-3-1 are adjusted to deflect.

[0081] When simulating the flow field of flight speed superimposed with shear wind field with different turbulence characteristics, the frequency of variable frequency axial flow fan 1-2-2 in the second power system 1-2 is adjusted based on the flow field simulation of flight speed superimposed with shear wind field and flight speed superimposed with storm flow.

[0082] When simulating the flow field of the superimposed gust wind field on the flight speed, the variable frequency axial flow fans 1-2-2 in the first power system 12 and the second power system 1-2 operate at the same frequency. The blades 1-3-2 arranged horizontally in each nozzle module 1-3-1 are adjusted to deflect at different frequencies and swing at different amplitudes, or the blades 1-3-2 arranged vertically in each nozzle module 1-3-1 are adjusted to deflect at different frequencies and swing at different amplitudes.

[0083] Example 1

[0084] When simulating a uniform and stable flow field using the complex wind field generation system with cascade cooperative distributed control provided by this invention, the specific operation steps are as follows:

[0085] Step S1: Remove the omnidirectional rectangular nozzle array 1-3 and the second power system 1-2 from the global complex wind field generator 1;

[0086] Step S2: Input the parameters of the target flow field, such as airflow velocity, into the control cabinet of the complex wind field generation system used for control-level serial cooperative distributed control;

[0087] Step S3: Start the variable frequency axial flow fan 1-2-2 in the first power system 12 through the control cabinet. The variable frequency axial flow fan 1-2-2 in the first power system 12 starts synchronously at the same frequency.

[0088] Step S4: The operator adjusts the speed of the variable frequency axial flow fan 1-2-2 in the first power system 12 through the control cabinet;

[0089] Step S5: The staff observes whether the flow field parameters during the operation of the complex wind field generation system with cascade cooperative distributed control are consistent with the description of the input target flow field; if they are inconsistent, return to step S4; if they are consistent, the wind tunnel test will begin normally.

[0090] Example 2

[0091] When simulating a uniform and stable flow field using the complex wind field generation system with cascade cooperative distributed control provided by this invention, the specific operation steps are as follows:

[0092] Step S1: Connect the inlet end of the compensation section 1-1 in the full-area complex wind field generator 1 to the outlet end of the contraction section 20.

[0093] Step S2: Input the parameters of the target flow field, such as airflow velocity, into the control cabinet of the complex wind field generation system used for control-level serial cooperative distributed control;

[0094] Step S3: Keep the blades 1-3-2 arranged horizontally in the omnidirectional rectangular nozzle array 1-3 of the omnidirectional complex wind field generator 1 horizontal, and keep the blades 1-3-2 arranged vertically in the omnidirectional rectangular nozzle array 1-3 of the omnidirectional complex wind field generator 1 vertical.

[0095] Step S4: Start the variable frequency axial flow fan 1-2-2 in the first power system 12 through the control cabinet. The variable frequency axial flow fan 1-2-2 in the first power system 12 starts synchronously at the same frequency.

[0096] Step S5: The operator adjusts the speed of the variable frequency axial flow fan 1-2-2 in the first power system 12 through the control cabinet;

[0097] Step S6: Start the variable frequency axial flow fan 1-2-2 in the second power system 1-2 through the control cabinet. The variable frequency axial flow fan 1-2-2 in the second power system 1-2 starts synchronously at the same frequency. During the operation of the complex wind field generation system with cascade collaborative distributed control, the staff observes whether the operation of the variable frequency axial flow fan 1-2-2 in the second power system 1-2 is stable. If the operation of the variable frequency axial flow fan 1-2-2 in the second power system 1-2 is unstable, return to step S5; if the operation of the variable frequency axial flow fan 1-2-2 in the second power system 1-2 is stable, proceed to step S6.

[0098] Step S7: The staff observes whether the flow field parameters during the operation of the complex wind field generation system with cascade cooperative distributed control are consistent with the description of the input target flow field; if they are inconsistent, return to step S5; if they are consistent, the wind tunnel test will begin normally.

[0099] Example 3

[0100] When simulating a horizontal wind shear flow field using the complex wind field generation system with cascade cooperative distributed control provided by this invention, the specific operation steps are as follows:

[0101] Step S1: Input the parameters of the target flow field into the control cabinet of the complex wind field generation system used for control-level serial cooperative distributed control, such as airflow velocity, airflow direction, airflow shear intensity, turbulence intensity, etc.

[0102] Step S2: Preset the operating parameters of the variable frequency axial flow fan 1-2-2 in the first power system 12 and the variable frequency axial flow fan 1-2-2 in the second power system 1-2 through the control cabinet, and preset the deflection angle of the vertically arranged blades 1-3-2 in the omnidirectional rectangular nozzle array 1-3 from left to right and from right to left.

[0103] Step S3: Start the variable frequency axial flow fan 1-2-2 in the first power system 12 through the control cabinet. The variable frequency axial flow fan 1-2-2 in the first power system 12 starts synchronously at the same frequency.

[0104] Step S4: The operator adjusts the speed of the variable frequency axial flow fan 1-2-2 in the first power system 12 through the control cabinet;

[0105] Step S5: Adjust the speed of each row of variable frequency axial flow fans 1-2-2 in the second power system 1-2 through the control cabinet to determine whether the operation of each variable frequency axial flow fan 1-2-2 in the second power system 1-2 is normal and whether the speed of each variable frequency axial flow fan 1-2-2 in the second power system 1-2 has reached the maximum. If the operation of each variable frequency axial flow fan 1-2-2 in the second power system 1-2 and / or the speed of each variable frequency axial flow fan 1-2-2 in the second power system 1-2 do not meet the requirements, return to step S4. If the operation of each variable frequency axial flow fan 1-2-2 in the second power system 1-2 and the speed of each variable frequency axial flow fan 1-2-2 in the second power system 1-2 both meet the requirements, proceed to step S6.

[0106] Step S6: Adjust the swing direction of the vertically arranged blades 1-3-2 in each row of nozzle modules 1-3-1 in the omnidirectional rectangular nozzle array 1-3 through the control cabinet;

[0107] Step S7: The staff observes whether the flow field parameters during the operation of the complex wind field generation system with cascade cooperative distributed control are consistent with the description of the target flow field input in step S1; if they are inconsistent, return to step S5; if they are consistent, the wind tunnel test will begin normally.

[0108] Example 4

[0109] When using the cascaded cooperative distributed control system provided by this invention to simulate the vertical wind shear (downburst) flow field, the specific operation steps are as follows:

[0110] Step S1: Input the parameters of the target flow field into the control cabinet of the complex wind field generation system used for control-level serial cooperative distributed control, such as airflow velocity, airflow direction, airflow shear intensity, turbulence intensity, etc.

[0111] Step S2: Preset the operating parameters of the variable frequency axial flow fan 1-2-2 in the first power system 12 and the variable frequency axial flow fan 1-2-2 in the second power system 1-2 through the control cabinet, and preset the deflection angle of the horizontally arranged blades 1-3-2 in the omnidirectional rectangular nozzle array 1-3 when swinging downward from the horizontal state.

[0112] Step S3: Start the variable frequency axial flow fan 1-2-2 in the first power system 12 through the control cabinet. The variable frequency axial flow fan 1-2-2 in the first power system 12 starts synchronously at the same frequency.

[0113] Step S4: The operator adjusts the speed of the variable frequency axial flow fan 1-2-2 in the first power system 12 through the control cabinet;

[0114] Step S5: Adjust the speed of all variable frequency axial flow fans 1-2-2 in the second power system 1-2 through the control cabinet to determine whether the operation of each variable frequency axial flow fan 1-2-2 in the second power system 1-2 is normal and whether the speed of each variable frequency axial flow fan 1-2-2 in the second power system 1-2 has reached the maximum. If the operation of each variable frequency axial flow fan 1-2-2 in the second power system 1-2 and / or the speed of each variable frequency axial flow fan 1-2-2 in the second power system 1-2 do not meet the requirements, return to step S4. If the operation of each variable frequency axial flow fan 1-2-2 in the second power system 1-2 and the speed of each variable frequency axial flow fan 1-2-2 in the second power system 1-2 both meet the requirements, proceed to step S6.

[0115] Step S6: Adjust the blades 1-3-2 arranged horizontally in all nozzle modules 1-3-1 of the omnidirectional rectangular nozzle array 1-3 to swing downward through the control cabinet, and adjust the vibration frequency of the blades 1-3-2 arranged horizontally in all nozzle modules 1-3-1 of the omnidirectional rectangular nozzle array 1-3.

[0116] Step S7: The staff observes whether the flow field parameters during the operation of the complex wind field generation system with cascade cooperative distributed control are consistent with the description of the target flow field input in step S1; if they are inconsistent, return to step S5; if they are consistent, the wind tunnel test will begin normally.

[0117] Example 5

[0118] When using the cascaded cooperative distributed control system provided by this invention to simulate the flow field of a complex wind field, the specific operation steps are as follows:

[0119] Step S1: Input the parameters of the target flow field into the control cabinet of the complex wind field generation system used for control-level serial cooperative distributed control, such as airflow velocity, airflow direction, airflow shear intensity, turbulence intensity, etc.

[0120] Step S2: Preset the operating parameters of the variable frequency axial flow fan 1-2-2 in the first power system 12 and the variable frequency axial flow fan 1-2-2 in the second power system 1-2 through the control cabinet, and preset the deflection angle of the horizontally arranged blades 1-3-2 in the omnidirectional rectangular nozzle array 1-3 when swinging upward from the horizontal state.

[0121] Step S3: Start the variable frequency axial flow fan 1-2-2 in the first power system 12 through the control cabinet. The variable frequency axial flow fan 1-2-2 in the first power system 12 starts synchronously at the same frequency.

[0122] Step S4: The operator adjusts the speed of the variable frequency axial flow fan 1-2-2 in the first power system 12 through the control cabinet;

[0123] Step S5: Adjust the speed of all variable frequency axial flow fans 1-2-2 in the second power system 1-2 through the control cabinet to determine whether the operation of each variable frequency axial flow fan 1-2-2 in the second power system 1-2 is normal and whether the speed of each variable frequency axial flow fan 1-2-2 in the second power system 1-2 has reached the maximum. If the operation of each variable frequency axial flow fan 1-2-2 in the second power system 1-2 and / or the speed of each variable frequency axial flow fan 1-2-2 in the second power system 1-2 do not meet the requirements, return to step S4. If the operation of each variable frequency axial flow fan 1-2-2 in the second power system 1-2 and the speed of each variable frequency axial flow fan 1-2-2 in the second power system 1-2 both meet the requirements, proceed to step S6.

[0124] Step S6: Adjust the blades 1-3-2 arranged horizontally in all nozzle modules 1-3-1 of the omnidirectional rectangular nozzle array 1-3 to swing upward through the control cabinet.

[0125] Step S7: The staff observes whether the flow field parameters during the operation of the complex wind field generation system with cascade cooperative distributed control are consistent with the description of the target flow field input in step S1; if they are inconsistent, return to step S5; if they are consistent, the wind tunnel test will begin normally.

[0126] Example 6

[0127] When simulating gust flow fields using the cascaded cooperative distributed control system for complex wind field generation provided by this invention, the specific operation steps are as follows:

[0128] Step S1: Remove the second power system 1-2 in the all-domain complex wind field generator 1, and connect the inlet end of the omnidirectional rectangular nozzle array 1-3 in the all-domain complex wind field generator 1 to the outlet end of the compensation section 1-1 in the all-domain complex wind field generator 1.

[0129] Step S2: Input the parameters of the target flow field into the control cabinet of the complex wind field generation system used for control-level serial cooperative distributed control, such as: airspeed, gust amplitude, gust gradient distance, etc.

[0130] Step S3: Preset the operating parameters of the variable frequency axial flow fan 1-2-2 in the first power system 12 through the control cabinet, and preset the deflection angle of the horizontally arranged blades 1-3-2 in the omnidirectional rectangular nozzle array 1-3 to swing up and down from the horizontal state.

[0131] Step S4: Start the variable frequency axial flow fan 1-2-2 in the first power system 12 through the control cabinet. The variable frequency axial flow fan 1-2-2 in the first power system 12 starts synchronously at the same frequency.

[0132] Step S5: The operator adjusts the speed of the variable frequency axial flow fan 1-2-2 in the first power system 12 through the control cabinet;

[0133] Step S6: The staff observes whether the airspeed during the operation of the complex wind field generation system with cascaded collaborative distributed control is consistent with the airspeed input in step S2; if they are inconsistent, return to step S4; if they are consistent, proceed to step S7.

[0134] Step S7: Adjust the blades 1-3-2 arranged horizontally in all nozzle modules 1-3-1 of the omnidirectional rectangular nozzle array 1-3 by controlling the control cabinet to swing up and down.

[0135] Step S8: The staff observes whether the flow field parameters during the operation of the complex wind field generation system with cascade cooperative distributed control are consistent with the description of the target flow field input in step S1; if they are inconsistent, return to step S7; if they are consistent, the wind tunnel test will begin normally.

[0136] Those skilled in the art should understand that the above embodiments are merely for illustrating the present invention and are not intended to limit the scope of the invention. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present invention.

Claims

1. A complex wind farm generation system with cascaded cooperative distributed control, characterized in that, It includes a wind tunnel body in a return shape, and the wind tunnel body includes a first diffuser section (7), a first corner section (8), a second diffuser section (9), a second corner section (10), a first power system (12), a third diffuser section (13), a third corner section (14), a heat exchanger (16), a fourth corner section (18), a stabilization section (19), and a contraction section (20) arranged in sequence; an all-region complex wind field generating device (1) for adjusting the air flow generation mode, air flow velocity, air flow injection direction, air flow swing frequency, and air flow swing amplitude is installed at the outlet end of the contraction section (20), and a collector (3) is installed at the inlet end of the first diffuser section (7), and there is a certain distance between the outlet end of the all-region complex wind field generating device (1) and the inlet end of the collector (3).

2. The complex wind farm generation system with cascaded cooperative distributed control according to claim 1, characterized in that, The all-region complex wind field generating device (1) includes a second power system (1-2) and an omnidirectional rectangular nozzle array (1-3) arranged in sequence at the outlet end of the contraction section (20); the omnidirectional rectangular nozzle array (1-3) includes nozzle modules (1-3-1) covering the outlet end of the second power system (1-2), and blades (1-3-2) for dividing its interior into multiple channels are provided in the nozzle modules (1-3-1), and the blades (1-3-2) can swing within the nozzle modules (1-3-1).

3. The complex wind farm generation system with cascaded cooperative distributed control according to claim 2, characterized in that, The all-region complex wind field generating device (1) further includes a compensation section (1-1) connected between the contraction section (20) and the second power system (1-2).

4. The complex wind farm generation system with cascaded cooperative distributed control according to claim 2, characterized in that, There are four blades (1-3-2) in the nozzle module (1-3-1), and the four blades (1-3-2) are arranged in a cross shape within the nozzle module (1-3-1).

5. The complex wind farm generation system with cascaded cooperative distributed control according to claim 2, characterized in that, The cross section of the blade (1-3-2) is in the streamline-shaped airfoil.

6. The complex wind farm generation system with cascaded cooperative distributed control according to claim 3, characterized in that, The second power system (1-2) includes a fan array housing (1-2-1) connected to the outlet end of the compensation section (1-1) and multiple variable-frequency axial fans (1-2-2) covering the inside of the fan array housing (1-2-1).

7. The complex wind farm generation system with cascaded cooperative distributed control according to claim 6, characterized in that, Multiple variable-frequency axial fans (1-2-2) are arranged in a rectangular array at the outlet end of the compensation section (1-1), and multiple nozzle modules (1-3-1) are arranged in a rectangular array at the outlet ends of the multiple variable-frequency axial fans (1-2-2).

8. The complex wind farm generation system with cascaded cooperative distributed control according to claim 6, characterized in that, One nozzle module (1-3-1) corresponds to four variable-frequency axial fans (1-2-2).

9. The complex wind farm generation system with cascaded cooperative distributed control according to claim 1, characterized in that, A front section of the power section (11) is further connected between the first power system (12) and the second corner section (10).

10. The complex wind farm generation system with cascaded cooperative distributed control according to claim 9, characterized in that, The first power system (12) is one or more high-power variable-frequency axial fans (1-2-2) covering the outlet end of the front section of the power section (11).

11. The complex wind farm generation system with cascaded cooperative distributed control according to claim 6 or 9, characterized in that, The variable frequency axial flow fan (1-2-2) includes an air inlet hood (1-2-2-1), a pressurization section (1-2-2-5), and an exhaust hood (1-2-2-7) connected in sequence. A rectifier head cover (1-2-2-2) is installed at the center of the air inlet hood (1-2-2-1), and a rectifier tail cover (1-2-2-6) is installed inside the exhaust hood (1-2-2-7). A variable frequency motor is installed inside the rectifier tail cover (1-2-2-6), and a rotating impeller (1-2-2-3) is installed at the output end of the variable frequency motor. Multiple anti-rotation plates (1-2-2-4) are evenly spaced along the circumference of the rectifier tail cover (1-2-2-6) and the inner wall of the pressurization section (1-2-2-5).

12. The complex wind farm generation system with cascaded cooperative distributed control according to claim 11, characterized in that, The inlet end of the air intake hood (1-2-2-1) and the outlet end of the exhaust hood (1-2-2-7) are both rectangular, and the outlet end of the air intake hood (1-2-2-1) and the inlet end of the exhaust hood (1-2-2-7) are both circular.

13. The complex wind farm generation system with cascaded cooperative distributed control according to claim 11, characterized in that, The side view formed by the fairing (1-2-2-2), the booster section (1-2-2-5), and the fairing tail (1-2-2-6) is an airfoil with a streamlined shape.

14. The complex wind farm generation system with cascaded cooperative distributed control according to claim 1, characterized in that, The heat exchanger (16) is connected to the third corner section (14) by a front section (15), and the heat exchanger (16) is connected to the fourth corner section (18) by a rear section (17).

15. The complex wind farm generation system with cascaded cooperative distributed control according to claim 1, characterized in that, The stable section (19) is equipped with a honeycomb device and a damping net, and corner guide plates are provided in the first corner section (8), the second corner section (10), the third corner section (14) and the fourth corner section (18).

16. A method for constructing complex wind farms using cascaded cooperative distributed control, characterized in that, The complex wind farm generation system, including the cascaded cooperative distributed control system as described in any one of claims 1 to 15, further includes the following steps: Step S1: Determine the simulated flow field; Step S2: Based on the simulated flow field characteristics, determine and adjust the operating frequency of the variable frequency axial flow fan (1-2-2) in the first power system (12) at the same frequency; determine whether the all-domain complex wind field generator (1) is installed and disassemble it; determine the operating mode and operating frequency of multiple variable frequency axial flow fans (1-2-2) in the second power system (1-2) and adjust them; based on the simulated flow field characteristics, determine the blades (1-3-2) that need to swing in the omnidirectional rectangular nozzle array (1-3), determine the swing direction, swing frequency, and swing amplitude of the blades (1-3-2), and adjust them.

17. The method for constructing complex wind farms using cascaded cooperative distributed control according to claim 16, characterized in that, During the simulation of a uniform and stable flow field, the variable frequency axial flow fan (1-2-2) in the first power system (12) operates at the same frequency, and the omnidirectional rectangular nozzle array (1-3) and the second power system (1-2) in the global complex wind field generator (1) are removed, or the second power system (1-2) in the global complex wind field generator (1) does not operate and the blades (1-3-2) in the omnidirectional rectangular nozzle array (1-3) do not swing.

18. The method for constructing complex wind farms using cascaded cooperative distributed control according to claim 16, characterized in that, When simulating the flow field of the superimposed shear wind field or the superimposed downburst or heat island wind field of the flight speed, the variable frequency axial flow fan (1-2-2) in the first power system (12) operates at the same frequency, and the variable frequency axial flow fan (1-2-2) in the second power system (1-2) is layered. The variable frequency axial flow fans (1-2-2) in the same layer of the second power system (1-2) operate at the same frequency, and the variable frequency axial flow fans (1-2-2) in different layers of the second power system (1-2) operate at different frequencies. The blades (1-3-2) arranged horizontally in each nozzle module (1-3-1) are deflected, or the blades (1-3-2) arranged vertically in each nozzle module (1-3-1) are deflected.

19. The method for constructing complex wind farms using cascaded cooperative distributed control according to claim 18, characterized in that, When simulating the flow field of flight speed superimposed with shear wind field with different turbulence characteristics, the frequency of the variable frequency axial flow fan (1-2-2) in the second power system (1-2) is adjusted based on the flow field simulation of flight speed superimposed with shear wind field or flight speed superimposed with storm flow or heat island wind field.

20. The method for constructing complex wind farms using cascaded cooperative distributed control as described in claim 18, characterized in that, When simulating the flow field of the superimposed gust wind field of the flight speed, the variable frequency axial flow fan (1-2-2) in the first power system (12) and the second power system (1-2) operate at the same frequency, and adjust the horizontally arranged blades (1-3-2) in each nozzle module (1-3-1) to deflect at different frequencies and swing at different amplitudes, or adjust the vertically arranged blades (1-3-2) in each nozzle module (1-3-1) to deflect at different frequencies and swing at different amplitudes.

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