Direct-current wind tunnel array system

Abstract

The invention discloses a straight-flow wind tunnel array system, and relates to the technical field of straight-flow wind tunnels. The system comprises a plurality of wind tunnel modules, and each wind tunnel module comprises a controller, a power section, an air inlet section, an expansion section and a stable section. According to the invention, the direct-current wind tunnel is miniaturized, standardized and modularized, the airflow speed (not lower than 40m / s) and the airflow quality of each small direct-current wind tunnel are kept, then the multiple standard modular small direct-current wind tunnels are quickly spliced and constructed into the wind tunnel array, and the rotating speed of each small direct-current wind tunnel can be independently controlled through a control program; the wind tunnel module is arranged in the wind tunnel module to realize natural wind field environments such as gust, tangential wind and abrupt change wind, the contraction section and the active grating are additionally arranged on the wind tunnel module, the contraction section generates stable wind speed close to 70 m / s-80 m / s in a slightly small test area, and the active grating can change the turbulence intensity of airflow in the test area so as to meet the requirements of various turbulence tests. And the wind tunnel array with higher wind speed, variable wind field and variable turbulence can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of direct-current wind tunnels, and particularly to a direct-current wind tunnel array system. Background Art

[0002] A direct-current wind tunnel, i.e., a wind tunnel laboratory, is a tubular experimental device that artificially generates and controls airflows to simulate the airflow around an aircraft or an entity, and can measure the effect of the airflow on the entity and observe physical phenomena. It is one of the most commonly used and effective tools for aerodynamic experiments, and wind tunnel experiments are an indispensable part of aircraft development work; The airflow velocity generated in the test section of a conventional direct-current wind tunnel can meet the usage scenarios with a velocity of not less than 30 m / s and generally not exceeding 100 m / s, and the quality of the airflow is very good (the turbulence intensity is very low, usually reaching 0.5% or even lower); However, the generated airflow usually has only a constant direction and a constant frequency, and it is difficult to simulate the natural airflow conditions near the ground surface, such as gusts, tangential winds, sudden winds, and continuous winds with a relatively high turbulence intensity; The fan array patents with publication numbers CN109477770A and CN219865511U form a fan array through individually controllable fans, and the airflow generated downstream of the array can achieve a usage scenario with a velocity of not less than 20 m / s, and can better simulate the natural airflow conditions near the ground surface, but the usage scenarios with a higher wind speed cannot be satisfied; In addition, limited by the fan size of the fan array and the array function, its turbulence intensity often exceeds 1% (after rectification) or even 6% or higher (without rectification), and low-turbulence-intensity test scenarios cannot be carried out; In view of the above problems, the inventor proposes a direct-current wind tunnel array system to solve the above problems. Summary of the Invention

[0003] In order to solve at least one technical problem involved in the background art, the purpose of the present invention is to provide a direct-current wind tunnel array system.

[0004] To solve the above technical problems, the present invention adopts the following technical solution: a direct-current wind tunnel array system, which is composed of several wind tunnel modules; Each wind tunnel module includes a controller, a power section, an intake section, a diffuser section, and a stabilization section. One end of the power section is fixedly connected to one end of the intake section, the end of the power section far from the intake section is fixedly connected to one end of the diffuser section, and one end of the stabilization section is fixedly connected to the end of the diffuser section far from the power section; Among them, the cross-sectional area of the power section is smaller than the cross-sectional area of the end of the intake section far from the power section, and the cross-sectional area of the power section is smaller than the cross-sectional area of the end of the expansion section far from the power section; Adjacent wind tunnel modules are connected through the intake section and / or the expansion section; A fan is assembled on the inner wall of the power section, and the fan transports the gas from the intake section through the expansion section to the stabilization section; An air flow stabilization device is provided on the inner wall of the stabilization section.

[0005] Preferably, the air flow stabilization device includes a honeycomb device and a plurality of damping nets arranged at intervals; Among them, the honeycomb device is arranged at one end close to the expansion section, and the plurality of damping nets arranged at intervals are arranged at one end far from the expansion section.

[0006] Preferably, an accommodation space is formed between the power sections of adjacent wind tunnel modules, and the controller is arranged in the accommodation space.

[0007] Preferably, the controller includes a plurality of control modules, and the control modules control the fans in the wind tunnel modules.

[0008] Preferably, the inlet cross-section of the intake section is square, the outlet of the intake section is circular, and the inner diameter of the circular outlet of the intake section is the same as the inner diameter of the power section.

[0009] Preferably, the inlet of the expansion section is circular, the inner diameter of the circular inlet of the expansion section is the same as the inner diameter of the power section, and the outlet cross-section of the expansion section is square.

[0010] Preferably, the cross-sectional dimensions of the stabilization section, the cross-sectional dimensions of the outlet of the expansion section, and the cross-sectional dimensions of the inlet of the intake section are all the same.

[0011] Preferably, a protective net is assembled at one end of the intake section far from the power section.

[0012] Preferably, a stabilizing frame is fixedly installed at the gap between several wind tunnel modules.

[0013] Preferably, a contraction section is fixedly installed at one end of the stabilization section far from the expansion section, and an active grille is fixedly assembled at the outlet of the contraction section, and the active grille is controlled by the controller corresponding to the wind tunnel module.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the present invention, by miniaturizing, standardizing, and modularizing the direct-current wind tunnel, the air flow velocity (not less than 40 m / s) and air flow quality of each small direct-current wind tunnel are maintained. Then, numerous standard modular small direct-current wind tunnels are quickly spliced and built into a wind tunnel array. The rotation speed of each small direct-current wind tunnel can be individually controlled through a control program to achieve natural wind field environments such as gusts, tangential winds, and sudden winds. 2. In the present invention, by adding a contraction section and an active grid to the wind tunnel module, the contraction section generates a stable wind speed close to 70 m / s - 80 m / s in a slightly smaller test area, and the active grid can change the turbulence intensity of the air flow in the test area to meet the needs of various turbulence tests, and a wind tunnel array with higher wind speed, variable wind field, and variable turbulence can be satisfied. 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 use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a schematic diagram of the overall structure of a direct-current wind tunnel array system of the present invention.

[0017] Figure 2 It is a side view of the wind tunnel module in Embodiment 1 of the present invention.

[0018] Figure 3 It is a front view of the wind tunnel module in Embodiment 1 of the present invention.

[0019] Figure 4 It is a schematic diagram of the composition structure of the wind tunnel module in Embodiment 1 of the present invention.

[0020] Figure 5 It is a side view of the wind tunnel module in Embodiment 2 of the present invention.

[0021] Figure 6 It is a front view of the wind tunnel module in Embodiment 2 of the present invention.

[0022] Figure 7 It is a schematic diagram of the structure of the contraction section and the active grid in Embodiment 3 of the present invention.

[0023] In the figure: 10, wind tunnel module; 20, controller; 1, power section; 2, intake section; 3, expansion section; 5, stabilization section; 11, fan; 21, protective net; 51, honeycomb device; 52, damping net; 6, contraction section; 61, active grid; 7, stabilizing frame. Detailed Embodiments

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] Series of Embodiments I: As Figure 2-4 shown, the present invention provides a direct-current wind tunnel array system. The direct-current wind tunnel array system is composed of 9 wind tunnel modules 10, and the wind tunnel modules 10 are combined in a 3*3 array to form a square cross-section. In some alternative embodiments, the wind tunnel modules 10 can also be combined in a 2*2 or 4*4 array. Or in some specific scenarios, the wind tunnel modules 10 can also be an asymmetric array, such as a 2*3 or 4*5 array.

[0026] The wind tunnel module 10 includes a controller 20, a power section 1, an intake section 2, an expansion section 3, and a stabilization section 5. One end of the power section 1 is fixedly connected to one end of the intake section 2, the end of the power section 1 away from the intake section 2 is fixedly connected to one end of the expansion section 3, and one end of the stabilization section 5 is fixedly connected to the end of the expansion section 3 away from the power section 1; Among them, the cross-sectional area of the power section 1 is smaller than the cross-sectional area of the end of the intake section 2 away from the power section 1, and the cross-sectional area of the power section 1 is smaller than the cross-sectional area of the end of the expansion section 3 away from the power section 1. In some embodiments, the cross-sectional area of the end of the intake section 2 away from the power section 1 is the same as or nearly the same as the cross-sectional area of the end of the expansion section 3 away from the power section 1, and the cross-sectional area of the power section 1 is 90%, or 81%, or 80%, or 64%, or 60%, or 50%, or 49%, or 40%, etc. of the two.

[0027] Adjacent wind tunnel modules 10 are connected through the intake section 2 and / or the expansion section 3; A fan 11 is assembled on the inner wall of the power section 1. The fan 11 conveys gas from the intake section 2 through the expansion section 3 to the stabilization section 5. The fan 11 adopts a ducted fan. The interior of the power section 1 is used to fix the fan 11, the intake section 2, and the expansion section 3 and is connected to the stabilization section 5. The inlet of the power section 1 is the inlet of the expansion section 3. After the fan 11 is powered on, the motor of the fan 11 rotates at a high speed to generate an air flow of not less than 40 m / s, and the diameter of the fan 11 does not exceed 90 mm; The inlet of the intake section 2 is a square with a side length of not more than 100 mm * 100 mm, and the outlet is a circle with the same diameter as the fan 11. The cross-sectional curve from the inlet to the outlet gradually changes from a square to a circle, with a certain contraction angle, and the contraction angle can be 5°, or 10°, or 15°, or 20°, or 30°; The inlet of the expansion section 3 is circular with the same diameter as that of the fan 11, and the outlet is a square with a size not exceeding 100mm * 100mm. The cross-sectional curve from the inlet to the outlet changes from circular to square with a certain expansion angle, which can be 5°, or 10°, or 15°, or 20°, or 30°. The dimensions of the inlet, outlet of the stabilization section 5 and each cross-section in the length direction of the stabilization section 5 are the same as those of the outlet of the expansion section 3. An air flow stabilization device is provided on the inner wall of the stabilization section 5.

[0028] The air flow stabilization device includes a honeycomb 51 and a number of damping meshes 52 arranged at intervals. Among them, the honeycomb 51 is arranged at one end close to the expansion section 3, and a number of damping meshes 52 arranged at intervals are arranged at one end far from the expansion section 3. In some embodiments, the interval between the damping meshes 52 is smaller than the interval between the honeycomb 51 and the damping meshes 52. In some embodiments, let the distance between the honeycomb 51 and the outlet of the expansion section 3 be a, and the distance between the honeycomb 51 and the damping meshes 52 be b, where 0.5b ≤ a ≤ 2b to improve the stability of the air flow.

[0029] The honeycomb 51 can be composed of a series of small short tubes with equal cross-sections arranged in parallel, which is used to straighten the air flow, make it parallel to the central axis of the wind tunnel module 10, improve the velocity distribution of the flow field, reduce the non-uniformity of the flow field, and at the same time divide the large-scale turbulent vortices in the flow field into small-scale (not larger than the grid scale of the honeycomb 51) turbulent vortices, which is beneficial to accelerating the decay of turbulence. The damping mesh 52 can further reduce the turbulence intensity downstream of the honeycomb 51 to the requirements of low turbulence intensity in the experimental area.

[0030] An accommodation space is formed between adjacent wind tunnel modules 10 in the power section 1, and the controller 20 is arranged in the accommodation space.

[0031] The controller 20 includes 9 control modules, and the control modules control the fans 11 in the wind tunnel module 10. The 9 control modules can independently control each fan 11 on the wind tunnel module 10.

[0032] The inlet cross-section of the intake section 2 is square, the outlet of the intake section 2 is circular, and the inner diameter of the circular outlet of the intake section 2 is the same as the inner diameter of the power section 1.

[0033] The inlet of the expansion section 3 is circular, the inner diameter of the circular inlet of the expansion section 3 is the same as the inner diameter of the power section 1, and the outlet cross-section of the expansion section 3 is square.

[0034] The cross-sectional dimensions of the stabilization section 5, the cross-sectional dimensions of the outlet of the expansion section 3, and the cross-sectional dimensions of the inlet of the intake section 2 are the same.

[0035] A protective net 21 is assembled at one end of the intake section 2 away from the power section 1.

[0036] A stabilizing frame 7 is fixedly installed at the gap between the 9 wind tunnel modules 10. The stabilizing frame 7 is used to place multiple wind tunnel modules 10. Since the fan 11 in the wind tunnel module 10 rotates too fast, there is a risk of product overturning. It is necessary to place the wind tunnel module 10 in a specially designed stabilizing frame 7 for fixation, so as to ensure the stability and safety of the product during operation.

[0037] Example Series Two: As Figure 5-6 shown, the present invention provides a direct current type wind tunnel array system, and the direct current type wind tunnel array system is composed of 16 wind tunnel modules 10; The wind tunnel module 10 includes a controller 20, a power section 1, an intake section 2, a diffuser section 3 and a stabilizing section 5. One end of the power section 1 is fixedly connected to one end of the intake section 2, and one end of the power section 1 away from the intake section 2 is fixedly connected to one end of the diffuser section 3. One end of the stabilizing section 5 is fixedly connected to one end of the diffuser section 3 away from the power section 1; Among them, the cross-sectional area of the power section 1 is smaller than the cross-sectional area of one end of the intake section 2 away from the power section 1, and the cross-sectional area of the power section 1 is smaller than the cross-sectional area of one end of the diffuser section 3 away from the power section 1; Adjacent wind tunnel modules 10 are connected through the intake section 2 and / or the diffuser section 3; In some embodiments, the intake section 2 has a first connection surface. Adjacent wind tunnel modules 10 may include a first wind tunnel module and a second wind tunnel module. The first connection surface of the first wind tunnel module has a first connection mechanism, and the first connection surface of the second wind tunnel module has a second connection mechanism. The first connection mechanism and the second connection mechanism cooperate to fix the first wind tunnel module and the second wind tunnel module; it can be understood that the positional relationship between the first wind tunnel module and the second wind tunnel module can be an up-down relationship or a left-right relationship; the first connection mechanism and the second connection mechanism can be a buckle and a slot respectively, or a clamping claw and a slot respectively, or a slider and a slide rail respectively, or a screw hole and a screw respectively.

[0038] In some embodiments, the expansion section 3 has a second connection surface. Adjacent wind tunnel modules 10 may include a first wind tunnel module and a second wind tunnel module. The second connection surface of the first wind tunnel module has a third connection mechanism, and the second connection surface of the second wind tunnel module has a fourth connection mechanism. The third connection mechanism and the fourth connection mechanism cooperate to fix the first wind tunnel module and the second wind tunnel module. Understandably, the positional relationship between the first wind tunnel module and the second wind tunnel module can be an up-and-down relationship or a left-and-right relationship. The third connection mechanism and the fourth connection mechanism can be a buckle and a slot respectively, or a claw and a slot respectively, or a slider and a slide rail respectively, or a screw hole and a screw, etc. In some embodiments, adjacent wind tunnel modules 10 can be fixed only through the intake section 2, or only through the expansion section 3, or simultaneously through the intake section 2 and the expansion section 3.

[0039] A fan 11 is assembled on the inner wall of the power section 1, and the fan 11 conveys gas from the intake section 2 through the expansion section 3 to the stabilization section 5. An air flow stabilization device is provided on the inner wall of the stabilization section 5.

[0040] The air flow stabilization device includes a honeycomb device 51 and a number of damping nets 52 arranged at intervals. Among them, the honeycomb device 51 is arranged at one end close to the expansion section 3, and a number of damping nets 52 arranged at intervals are arranged at one end far from the expansion section 3.

[0041] Adjacent wind tunnel modules 10 form an accommodation space between the power sections 1, and a controller 20 is arranged in the accommodation space.

[0042] The controller 20 includes 16 control modules, and the control modules control the fans 11 in the wind tunnel modules 10.

[0043] The inlet section 2 has a square inlet cross-section, and the outlet of the inlet section 2 is circular. The inner diameter of the circular outlet of the inlet section 2 is the same as the inner diameter of the power section 1.

[0044] The inlet of the expansion section 3 is circular, the inner diameter of the circular inlet of the expansion section 3 is the same as the inner diameter of the power section 1, and the outlet cross-section of the expansion section 3 is square.

[0045] The cross-sectional dimensions of the stabilization section 5, the cross-sectional dimensions of the outlet of the expansion section 3, and the cross-sectional dimensions of the inlet of the intake section 2 are all the same.

[0046] A protective net 21 is assembled at one end of the intake section 2 far from the power section 1.

[0047] A stabilizing frame 7 is fixedly installed in the gaps between the 16 wind tunnel modules 10.

[0048] Example Series Three: As Figure 7As shown, at one end of the stable section 5 far from the expansion section 3, a contraction section 6 is fixedly installed. At the outlet of the contraction section 6, an active grid 61 is fixedly assembled. The active grid 61 is controlled by the corresponding controller 20 of the wind tunnel module 10. The main function of the contraction section 6 is to accelerate the air flow so that it reaches the air flow speed required in the test section. At the same time, it improves the flow field quality in the test section. The air flow contracts and speeds up through the contraction section 6, and can generate an air flow of no less than 80 m / s in the test area. The active grid 61 is used to adjust the air flow turbulence in the test area. The active grid 61 is installed at the downstream outlet of the contraction section 6, connected to a motor installed outside the tunnel structure and driven by the motor. The motor drives the active grid 61 to move, and the turbulence of the wake flow after the air flow passes through the active grid 61 will be controlled to increase, so as to realize the function of accurately adjusting the air flow turbulence in the test area.

[0049] Working principle: When the wind tunnel module 10 is powered on, each wind tunnel module 10 is controlled by the control software to work according to the requirements of unified consistency or customized difference in rotation speed and direction; The motor of the control module of the controller 20 drives the fan 11 to rotate. The air flow flows in from the intake section 2 upstream of the fan 11 and the power section 1, and a high-speed air flow of no less than 40 m / s is pushed out to its downstream expansion section 3. After the high-speed air flow passes through the stable section 5 and the honeycomb device 51 and the damping net 52 installed inside the stable section 5, a continuous, stable and relatively low-turbulence (0.5%) air flow with good quality is formed; When all the wind tunnel modules 10 of the wind tunnel array are under unified consistency control, the air flow generated by them will be a continuous and stable air flow. When all the fans 11 of the wind tunnel array are controlled according to a certain customized difference, the air flow generated by them will be a dynamically controllable air flow, and natural wind field environments such as gusts, tangential winds, and sudden winds can be realized; A contraction section 6 is installed at the downstream outlet of the stable section 5 of the wind tunnel module 10. When the air flow flows along the contraction section 6, the air flow will not separate on the wall of the contraction section 6, and the air flow at the outlet of the contraction section 6 will be very uniform, straight and stable, with an air flow speed of no less than 80 m / s and good turbulence (0.5%); At the downstream outlet of the contraction section 6 of the wind tunnel module 10, by installing the active grid 61, the active grid 61 accurately controls the turbulence of the air flow entering the test area. The active grid 61 is connected to a motor installed outside the tunnel structure and driven by the motor. The motor drives the active grid 61 to move, and the turbulence of the wake flow after the air flow passes through the active grid 61 will be controlled to increase, so as to realize the function of accurately adjusting the air flow turbulence in the test area.

[0050] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A direct-flow wind tunnel array system, characterized in that: The direct-flow wind tunnel array system is composed of a number of wind tunnel modules (10); The wind tunnel module (10) includes a controller (20), a power section (1), an intake section (2), a diffuser section (3), and a stabilization section (5). One end of the power section (1) is fixedly connected to one end of the intake section (2), one end of the power section (1) far from the intake section (2) is fixedly connected to one end of the diffuser section (3), and one end of the stabilization section (5) is fixedly connected to one end of the diffuser section (3) far from the power section (1); Among them, the cross-sectional area of the power section (1) is smaller than the cross-sectional area of the end of the intake section (2) far from the power section (1), and the cross-sectional area of the power section (1) is smaller than the cross-sectional area of the end of the diffuser section (3) far from the power section (1); Adjacent wind tunnel modules (10) are connected through the intake section (2) and / or the diffuser section (3); A fan (11) is assembled on the inner wall of the power section (1), and the fan (11) transports gas from the intake section (2) through the diffuser section (3) to the stabilization section (5); An air flow stabilizing device is provided on the inner wall of the stabilization section (5).

2. A direct-flow wind tunnel array system according to claim 1, characterized in that The air flow stabilizing device includes a honeycomb device (51) and a number of damping nets (52) arranged at intervals; Among them, the honeycomb device (51) is arranged at one end close to the diffuser section (3), and a number of the damping nets (52) arranged at intervals are arranged at one end far from the diffuser section (3).

3. A direct-flow wind tunnel array system according to claim 1, characterized in that Adjacent wind tunnel modules (10) form an accommodation space between the power sections (1), and the controller (20) is arranged in the accommodation space.

4. A direct-flow wind tunnel array system according to claim 3, characterized in that The controller (20) includes a number of control modules, and the control modules control the fans (11) in the wind tunnel module (10).

5. The direct-flow wind tunnel array system according to claim 1, wherein, The inlet cross-section of the intake section (2) is square, the outlet of the intake section (2) is circular, and the inner diameter of the circular outlet of the intake section (2) is the same as the inner diameter of the power section (1).

6. The direct-current wind tunnel array system according to claim 1, wherein The inlet of the diffuser section (3) is circular, the inner diameter of the circular inlet of the diffuser section (3) is the same as the inner diameter of the power section (1), and the outlet cross-section of the diffuser section (3) is square.

7. The direct-current wind tunnel array system according to claim 1, wherein, The cross-sectional dimensions of the stabilization section (5), the cross-sectional dimensions of the outlet of the diffuser section (3), and the cross-sectional dimensions of the inlet of the intake section (2) are all the same.

8. The direct-flow wind tunnel array system according to claim 1, wherein A protective net (21) is assembled at one end of the intake section (2) far from the power section (1).

9. The direct-current wind tunnel array system according to claim 1, wherein A stabilizing frame (7) is fixedly installed at the gap between a number of the wind tunnel modules (10).

10. A direct-flow wind tunnel array system according to claim 1, characterized in that, A contraction section (6) is fixedly installed at one end of the stabilization section (5) far from the diffuser section (3), and an active grille (61) is fixedly assembled at the outlet of the contraction section (6), and the active grille (61) is controlled by the corresponding controller (20) of the wind tunnel module (10).

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