Multi-fan active control wind tunnel

Abstract

The invention provides a multi-fan active control wind tunnel, and relates to the technical field of aerodynamic force, the multi-fan active control wind tunnel comprises a fan array mechanism which is installed on a fan array support and comprises a plurality of single fans arranged in an array mode, the fan array support comprises a plurality of fan installation positions arranged in an array mode, and each single fan is correspondingly installed on the fan installation position; each single fan is independently controlled and is connected with a power supply and a control system; the wind field sensor acquisition array mechanism is arranged at an outlet of the multi-fan active control wind tunnel and is mounted on the acquisition array bracket; the acquisition array bracket comprises a plurality of single sensors which are arranged in an array manner, the acquisition array bracket comprises a plurality of sensor mounting positions which are arranged in an array manner, and each single sensor is correspondingly mounted on the sensor mounting position; each single sensor is connected with a power supply and a signal acquisition system; the signal acquisition system can receive the wind field parameters and send the wind field parameters to the control system, and the wind field parameters can be adjusted in real time through the control system.

Description

Technical Field

[0001] The present invention relates to the technical field of aerodynamics, and more particularly, to a wind tunnel. Background Art

[0002] A wind tunnel is a tubular test device for conducting aerodynamic tests. It can artificially generate and control airflows to simulate the wind fields encountered by test devices during actual flight. By using the movement of the wind instead of the flight process of the test piece, it is an equivalent relative movement between the airflow and the test piece. Since the airflow encountered by the test piece during actual flight rarely undergoes drastic changes and can be regarded as flying in air with a uniform wind speed, the main function of the wind tunnel is to achieve the uniformity and laminar flow of the blowing to study the interaction between the wind and the test piece, and it was first used for the external shape design of aerospace.

[0003] However, with the progress and development of modern science, there are more and more disciplines that require blowing tests. Wind engineering has become an essential requirement in the fields of academic research and engineering construction. In particular, the coupling effect between the complex external shape of the test device and the dynamic wind effect has become a bottleneck restricting the development of all walks of life. For example, long-span bridges and super-high buildings are extremely sensitive to wind loads and have become one of the control factors in building structure design. Therefore, the influence of wind loads on these high, large, thin, and long flexible structures has attracted more and more attention from scientific researchers.

[0004] However, in essence, these studies require the wind tunnel to be able to generate an airflow with controllable speed and intensity that is consistent with the near-surface wind field. However, conventional wind tunnels mainly generate laminar flow. Therefore, there is an urgent need to modify or design the conventional wind tunnel accordingly so that it can generate the wind field parameters within the atmospheric boundary layer. Summary of the Invention

[0005] The purpose of the present invention is to provide a multi-fan actively controlled wind tunnel to solve the problem that the current conventional wind tunnel forms a uniform wind field with consistent wind speed and parameters, which is contrary to the atmospheric boundary layer wind field and cannot form a wind tunnel with wind field parameters close to those within the real atmospheric boundary layer.

[0006] To solve the above problems, the present invention first provides a multi-fan active control wind tunnel, comprising: a fan array mechanism, which is installed on a fan array bracket and includes multiple single fans arranged in an array. The fan array bracket includes a plurality of fan mounting positions arranged in an array, and each single fan is correspondingly installed on the fan mounting position; each single fan is independently controlled, and each single fan is connected to a power supply and a control system; a wind field sensor acquisition array mechanism, which is arranged at the outlet of the multi-fan active control wind tunnel and is installed on an acquisition array bracket to measure and collect wind field parameters in real time; it includes a plurality of single sensors arranged in an array. The acquisition array bracket includes a plurality of sensor mounting positions arranged in an array, and each single sensor is correspondingly installed on the sensor mounting position; each single sensor is connected to a power supply and a signal acquisition system; the signal acquisition system can receive the wind field parameters and send them to the control system, and the wind field parameters can be adjusted in real time through the control system.

[0007] Further, the control system includes: a power module, which can convert alternating current into direct current required by the single fans; a display and adjustment module, which displays the wind field parameters and can correspondingly adjust them; a signal transmission module, which converts the wind field parameters into PWM signals capable of controlling the rotation speed of the single fans and transmits them to the motors of the single fans.

[0008] Further, the single fans are low-inertia, single-motor or double-reverse double-motor axial fans.

[0009] Further, the multiple single fans can be of the same specification or different specifications.

[0010] Further, a plurality of vibration wing grids are installed at the outlet of the fan array mechanism, and the vibration wing grids can be independently adjusted.

[0011] Further, the single sensors are pitot tube flow meters or hot wire anemometers.

[0012] Further, after the wind field is formed, the operating parameters of each single fan can be solidified, and they can be edited into a control program and saved in the control system. By triggering the control program through an operation instruction, the wind field corresponding to the operating parameters can be formed.

[0013] Further, an AI model is connected to the control system, and the fan array mechanism is adjusted and controlled through the AI model.

[0014] A multi-fan active control wind tunnel provided by the present invention uses a small multi-fan array to replace a single or multiple large fans in a conventional wind tunnel. The arrangement is flexible and the floor area is reduced. Moreover, small DC fans are adopted, with low energy consumption, energy conservation and environmental protection. Multiple single fans are independently controlled and adjusted, and various atmospheric boundary layer wind fields such as gusts, continuous winds, tangential winds, special winds, laminar flows, and turbulent flows can be realized, thereby expanding the application of the wind tunnel in the fields of architecture, transportation, wind energy, and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0016] Figure 1 Structural schematic diagram of the multi-fan active control wind tunnel provided by the embodiment of the present invention;

[0017] Figure 2 Structural schematic diagram of the single fan provided by the embodiment of the present invention;

[0018] Figure 3 Structural schematic diagram of the fan array mechanism provided by the embodiment of the present invention;

[0019] Figure 4 Structural schematic diagram of the wind field sensor acquisition array mechanism provided by the embodiment of the present invention.

[0020] Description of the reference numerals:

[0021] 1 - fan array mechanism; 11 - single fan; 2 - fan array support; 3 - control system; 4 - wind field sensor acquisition array mechanism; 5 - acquisition array support; 6 - signal acquisition system. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe the specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] As a tool for studying the effects of gas flow on objects, wind tunnels were first applied in the aerospace field. However, with the demands of other industries for aspects such as shape design, wind resistance, and wind energy utilization, wind tunnel tests on buildings, building complexes, and bridges can be applied to architectural design to study the wind resistance performance of buildings and building complexes, provide guidance for the streamlined design of transportation vehicles such as cars, trains, and ships, provide reliable technical support for cluster wind farms and wind farm construction, and study the atmospheric dispersion problems of nuclear accidents in environmental protection, etc. Therefore, the demand for wind tunnels is penetrating into more and more fields. However, except for the aerospace field, the air flow patterns required in other fields are concentrated within the atmospheric boundary layer near the ground, and wind tunnels are required to be able to blow out a wind field that conforms to the real one within this boundary layer, such as the four types of wind fields A, B, C, and D in the specification, spatially non-uniform wind fields, temporally non-steady wind fields, turbulence power spectral density, wind speed time history, etc.

[0024] Currently, conventional wind tunnels mainly generate laminar flow. Therefore, there is an urgent need to transform or design conventional wind tunnels accordingly. To solve the problems existing in the prior art, this embodiment provides a multi-fan actively controlled wind tunnel, as Figure 1 shown, which includes a fan array mechanism 1 and a wind field sensor acquisition array mechanism 4. The fan array mechanism 1 is installed on the fan array bracket 2 and is formed by arranging multiple single-body fans 11 in an array. The single-body fans 11 are preferably small-sized, low-inertia, single-motor or double-reverse double-motor axial fans, which can obtain sufficient wind speed and wind pressure. As Figure 2 shown in the figure is a double-reverse double-motor axial fan, which is powered by low-voltage 12V DC. Each of its motors can be independently wired, so that each single-body fan 11 is connected to the power supply and the control system 3, and thus can be independently controlled and adjusted.

[0025] The cross-section of the multi-fan actively controlled wind tunnel is composed of a stack of multiple small fans. As Figure 3 shown, it can also be composed of 9, 16 or any number of single-body fans 11 to form the smallest installation module. The blowing cross-sections with different size requirements are composed of the smallest installation modules, and each installation module is installed on a dedicated supporting fan array bracket 2. There are multiple fan installation positions on the fan array bracket 2, and the single-body fans 11 are respectively installed on the fan installation positions one by one.

[0026] The wind field sensor acquisition array mechanism 4 is installed on the acquisition array bracket 5, as Figure 4As shown, for an 8×8 array or other quantity matrix, a wind field sensor acquisition array mechanism 4 is uniformly distributed on the acquisition array support 5. Specifically, a plurality of sensor mounting positions arranged in an array are provided on the acquisition array support 5, and each single sensor is correspondingly mounted on the sensor mounting position. Moreover, the wind field sensor acquisition array mechanism 4 is connected to a power supply and a signal acquisition system 6 for the acquisition and feedback of wind field parameters. After receiving the wind field parameters measured by the wind field sensor acquisition array mechanism 4, the signal acquisition system 6 can send them to the control system 3, and then the wind field parameters can be adjusted in real time through the control system 3, thereby controlling the fan array mechanism 1.

[0027] Specifically, the control system 3 includes a power module that converts alternating current into direct current required by the single fan 11; a display and adjustment module that displays the wind field parameters and can correspondingly adjust them; and a signal transmission module that converts the wind field parameters into PWM signals capable of controlling the rotation speed of the single fan 11 and transmits them to the motor of the single fan 11, thereby controlling the rotation speed of each single fan 11. Finally, the required wind field parameters are formed at the outlet of the multi-fan active control wind tunnel. At the same time, the wind field sensor acquisition array real-time collects the wind field parameters and feeds them back to the control system 3, and then the wind field parameters are adjusted in real time through the control system 3 to ensure the accuracy of the wind field parameters.

[0028] In a specific implementation, a fan array mechanism 1 can be composed of 16 double-reverse axial flow fans in a 4×4 configuration. Then, 100 fan array mechanisms 1 are used to form a multi-fan active control wind tunnel composed of 1600 single fans 11 in a 40×40 configuration, which are installed on a suitable fan array support 2. All 40×40 single fans 11 are connected to the power supply and the control system 3. An 8×8 wind field sensor acquisition array mechanism 4 and an acquisition array support 5 are designed at the outlet of the multi-fan active control wind tunnel; the 8×8 wind field sensor acquisition array mechanism 4 is connected to the signal acquisition system 6, and the signal acquisition system 6 is connected to the power supply and the control system 3 to form a complete multi-fan active control wind tunnel.

[0029] When the multi-fan active control wind tunnel operates, first, wind profile parameters such as the wind speed, blowing area, turbulence intensity, and operation time of the required wind field are input into the power supply and the control system 3, and then the system is started. The 8×8 wind field sensor acquisition array mechanism 4 and the signal acquisition system 6 real-time collect and send wind field data, and data such as the fan operation schematic diagram, wind profile schematic diagram, and operation parameters of each fan are visually displayed on the display module of the control system 3.

[0030] The multi-fan active control wind tunnel can solidify the fan operation parameters corresponding to all wind field parameters in the program to achieve one-key startup.

[0031] Preferably, for new requirements that need to customize the wind field parameters by oneself, the multi-fan active control wind tunnel provides access to the training algorithm based on the AI model. After inputting the required wind field parameters, it can be debugged by itself through the AI model. After obtaining the required wind field, the fan operation parameters can be saved in the program, so as to obtain an extended customized wind field test. Through the training of the AI model, the wind field parameters can be quickly realized, and a fast acquisition of any specified wind profile can be achieved.

[0032] Preferably, at the outlet of the fan array mechanism 1 of the multi-fan active control wind tunnel, vibration wing grids with different numbers and independently adjustable are installed to increase the turbulence intensity of the wind field by adjusting the frequency and amplitude of the vibration wing grids.

[0033] The multi-fan active control wind tunnel uses a pitot tube or a hot-wire anemometer array as the wind field sensor acquisition array mechanism 4, which can collect, realize, and calibrate the wind field parameters.

[0034] The present invention uses a small multi-fan array to replace the large fan of the conventional wind tunnel. The fan array can be installed in a modular or independent installation manner with any combination to achieve blowing cross-sections of different sizes; and the small fan uses a double-reverse fan type with two independent motors, and at the same time, higher wind speeds can be achieved by selecting different specifications of fans.

[0035] The multi-fan active control wind tunnel adopts the method of independently controlling each single fan 11, and independently controls based on the PWM speed regulation principle, and uses but is not limited to the PLC or single-chip microcomputer method to independently control each single fan 11.

[0036] In the description of this embodiment, it should be noted that those skilled in the art can understand that all or part of the processes of implementing the above embodiment methods can be completed by instructing a control device through a computer program. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the above method embodiments. The storage medium can be a memory, a disk, an optical disc, etc.

[0037] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

[0038] Finally, it should also be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0039] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0040] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-fan active control wind tunnel, characterized in that: include: A fan array mechanism (1) is mounted on a fan array bracket (2), comprising a plurality of individual fans (11) arranged in an array, wherein the fan array bracket (2) comprises a plurality of fan mounting positions arranged in an array, and each of the individual fans (11) is correspondingly mounted on the fan mounting position; each of the individual fans (11) is independently controlled, and each of the individual fans (11) is connected to a power supply and a control system (3); A wind field sensor collection array mechanism (4) is arranged at the exit of a multi-fan active control wind tunnel, and is mounted on a collection array bracket (5) to measure and collect wind field parameters in real time; it comprises a plurality of single sensors arranged in an array, the collection array bracket (5) comprises a plurality of sensor installation positions arranged in an array, and each of the single sensors is correspondingly installed on the sensor installation position; each of the single sensors is connected to a power supply and a signal collection system (6); The signal acquisition system (6) is capable of receiving the wind farm parameters and sending them to the control system (3), and the wind farm parameters can be adjusted in real time through the control system (3).

2. The multi-fan active control wind tunnel according to claim 1, characterized in that: The control system (3) comprises: A power module, wherein the power module can convert alternating current into direct current required by the single fan (11); A display and adjustment module, which displays the wind farm parameters and enables corresponding adjustments; A signal transmission module converts the wind field parameter into a PWM signal capable of controlling the rotation speed of the single-unit fan (11), and transmits the PWM signal to the motor of the single-unit fan (11).

3. The multi-fan active control wind tunnel according to any one of claims 1-2, characterized in that: The single fan (11) is a low moment of inertia, single-motor or double-reverse dual-motor axial flow fan.

4. The multi-fan active control wind tunnel according to claim 3, characterized in that: The plurality of single fans (11) may be of the same specification or of different specifications.

5. The multi-fan active control wind tunnel according to claim 3, characterized in that: A plurality of vibrating wing grids are installed at the outlet of the fan array mechanism (1), and the vibrating wing grids can be adjusted independently.

6. The multi-fan active control wind tunnel according to claim 3, characterized in that: The single sensor is a Pitot tube flowmeter or a hot wire anemometer.

7. The multi-fan active control wind tunnel according to claim 3, characterized in that: After the wind field is formed, the operating parameters of each of the single fans (11) can be solidified and edited into a control program and saved in the control system (3). The control program can be triggered by operating instructions to form a wind field corresponding to the operating parameters.

8. The multi-fan active control wind tunnel according to claim 7, characterized in that: An AI model is connected to the control system (3), and the fan array mechanism (1) is regulated and controlled by the AI ​​model.

Images