Aerodynamic performance testing device based on rectification structure

Abstract

The invention relates to a pneumatic performance test device based on a rectification structure, the pneumatic performance test device comprises a ventilation pipeline and the rectification structure, the ventilation pipeline comprises a centrifugal fan, an air supply section and an air outlet section, the centrifugal fan is arranged at the inlet end of the air supply section, and the outlet end of the air supply section is communicated with the inlet end of the air outlet section; the rectification structure is arranged between the outlet end of the air supply section and the inlet end of the air outlet section; the rectification structure comprises a first damping net, a honeycomb device and a second damping net, and the first damping net and the second damping net are symmetrically arranged on the two sides of the honeycomb device. Compared with the prior art, the rectification structure has the advantages of being good in rectification effect, convenient to mount and dismount and the like.

Description

Technical Field

[0001] The invention relates to the technical field of aerodynamic performance testing, and in particular to an aerodynamic performance testing device based on a rectification structure. Background Art

[0002] Automobile sealing is an important evaluation indicator of vehicle quality, affecting the performance of vehicle air conditioning, refrigeration, heating, dust prevention, rain prevention, and vehicle noise. There are many links and factors that affect the sealing performance of automobiles. Researchers conduct vehicle sealing tests to find leakage points or gaps and optimize the structural design to improve the driving safety and riding comfort of the car. The vehicle sealing test is to keep the vehicle body in its original state, that is, the four doors, tailgate, sunroof, glass, etc. are closed, and use airtight test equipment to maintain a constant static pressure inside the vehicle body, so as to test the airtightness leakage of the vehicle. How to turn automobile sealing performance testing and analysis into a standard and standardized process has become a long-term research topic in the industry, and the design and construction of automobile air leakage test equipment provides the most efficient and accurate way to do this.

[0003] All aerodynamic performance test benches, including automobile wind tunnels and air leakage test devices, have high requirements for flow field quality. When evaluating the quality of a flow field, people generally choose to observe indicators such as the uniformity, turbulence intensity, and airflow deflection angle of the flow field. The flow field with higher uniformity, lower turbulence intensity, and smaller airflow deflection angle is considered to have better quality and can provide better conditions for aerodynamic tests. At the same time, indicators such as the pressure loss coefficient can intuitively reflect the energy loss caused by achieving the purpose of rectification. Therefore, improving the quality of the flow field efficiently and economically is the consistent purpose of rectification structure design and optimization.

[0004] As the most widely used rectifying device in pneumatic test equipment, damping screen and honeycomb structure can significantly improve the quality of flow field, and at the same time, they bring low resistance loss and cause less energy consumption. Therefore, the selection of rectifying device should consider both its rectifying effect and its energy loss, and also take into account its manufacturing process and cost.

[0005] However, existing pneumatic test devices mostly use a single damping net or honeycomb structure for rectification. Some patents also use a combination of a honeycomb structure and a damping net with intervals for rectification. However, the rectification effect is average and the error of the pneumatic test device is relatively large. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects of the above-mentioned prior art that a single damping mesh or honeycomb structure is used for rectification in the pneumatic test device, or the honeycomb structure and damping mesh are arranged at intervals, the rectification effect is relatively general, and the error of the pneumatic test device is large, and to provide a pneumatic performance test device based on a rectification structure.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] An aerodynamic performance test device based on a rectification structure comprises a ventilation duct and a rectification structure, wherein the ventilation duct comprises a centrifugal fan, an air supply section and an air outlet section, wherein the centrifugal fan is arranged at the inlet end of the air supply section, the outlet end of the air supply section is connected to the inlet end of the air outlet section, and the rectification structure is arranged between the outlet end of the air supply section and the inlet end of the air outlet section; the rectification structure comprises a first damping net, a honeycomb and a second damping net, wherein the first damping net and the second damping net are symmetrically arranged on both sides of the honeycomb.

[0009] Preferably, the ventilation duct further comprises a fixed lock, and the air supply section and the air outlet section are detachably connected via the fixed lock.

[0010] Preferably, the outlet of the air supply section is provided with a first card slot, and the air inlet of the air outlet section is provided with a second card slot, the first card slot and the second card slot are spliced ​​into an installation slot that matches the rectification structure, and the rectification structure can be detachably installed in the installation slot.

[0011] Preferably, the device further comprises a first movable frame and a second movable frame, the air supply section is fixed on the first movable frame, and the air outlet section is fixed on the second movable frame.

[0012] Preferably, the honeycomb is a round tube honeycomb, and the aspect ratio of the honeycomb is in the range of 11.5-12.5.

[0013] Preferably, the circular tube honeycomb comprises a plurality of circular tube units, each of which is stacked, and the first damping net and the second damping net are clamped and installed on both sides of the circular tube honeycomb.

[0014] Preferably, the air supply section comprises a first DC section, a diffusion section and a first rectifying section which are connected in sequence; the cross-sectional area of ​​the first rectifying section is larger than the cross-sectional area of ​​the first DC section, and the centrifugal fan is located at one end of the first DC section away from the diffusion section.

[0015] Preferably, the air outlet section includes a second rectifying section, a contraction section and a second direct current section which are connected in sequence; the cross-sectional area of ​​the second rectifying section is larger than the cross-sectional area of ​​the second direct current section, and the end of the second rectifying section away from the contraction section is connected to the first rectifying section.

[0016] Preferably, a differential pressure gauge is provided in the second direct current section.

[0017] Preferably, the second direct current section comprises a flow guiding section and a mounting section, the flow guiding section and the mounting section are connected via a flange connector, and the differential pressure gauge is fixed in the mounting section.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] (1) The airflow generated by the centrifugal fan of this scheme is transported to the rectification structure through the air supply section of the ventilation duct, and is rectified by the first damping net, the honeycomb and the second damping net in sequence, and then transported through the air outlet section. The rectification structure reduces the airflow deflection angle in the ventilation duct, improves the airflow uniformity in the air outlet section, and reduces the airflow turbulence intensity.

[0020] The ventilation duct of the aerodynamic performance test device is rectified by adopting a rectification structure in which the first damping net and the second damping net are equipped with a honeycomb. Compared with the rectification structure in which the damping net is arranged downstream of the honeycomb, it has a better rectification effect, improves the flow field quality of the uneven flow field caused by the centrifugal fan, further reduces the experimental error of the aerodynamic performance test bench, and improves the test accuracy.

[0021] (2) In this scheme, the ventilation duct is constructed by splicing an air supply section and an air outlet section, and a fixed lock is used for detachable connection. The rectification structure is arranged between the air supply section and the air outlet section. The fixed lock can be opened to replace the rectification structure. The installation and disassembly of the rectification structure is faster, which facilitates the replacement of the rectification structure and reduces the cost of the device.

[0022] (3) In this solution, the air supply section and the air outlet section are fixed on the first movable frame and the second movable frame respectively. The distance between the air supply section and the air outlet section can be adjusted by moving the first movable frame and the second movable frame. The movement of the air supply section and the air outlet section is more labor-saving and quick, thereby improving the efficiency of installation and disassembly of the ventilation duct.

[0023] (4) In this scheme, the rectifying structure is composed of a circular tube honeycomb clamped by two layers of damping mesh. The circular tube honeycomb can be made of easily available materials, which greatly saves costs. The unit structure of the circular tube honeycomb is stacked and fixed with two layers of damping mesh clamps. There is no need to use traditional laser welding and other processes, which shortens the construction period and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of the aerodynamic performance test device provided by the present invention;

[0025] Figure 2 A schematic diagram of a rectifier structure provided by the present invention;

[0026] Figure 3 A schematic diagram of the structure of a honeycomb device provided by the present invention;

[0027] Figure 4 A schematic diagram of the structure of the damping net provided by the present invention;

[0028] Figure 5 A schematic diagram of the structure of the connection between the air supply section and the air outlet section provided by the present invention;

[0029] In the figure: 1, ventilation duct, 2, rectification structure, 3, first mobile frame, 4, second mobile frame; 11, centrifugal fan, 12, air supply section, 13, air outlet section, 14, fixed lock, 15, differential pressure gauge, 16, flange connector; 21, first damping net, 22, honeycomb, 23, second damping net; 121, first DC section, 122, diffusion section, 123, first rectification section; 131, second rectification section, 132, contraction section, 133, second DC section. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0034] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] Example 1

[0037] like Figure 1 and Figure 2 As shown, this embodiment provides an aerodynamic performance test device based on a rectification structure, including a ventilation duct 1 and a rectification structure 2, the ventilation duct 1 includes a centrifugal fan 11, an air supply section 12 and an air outlet section 13, the centrifugal fan 11 is arranged at the inlet end of the air supply section 12, the outlet end of the air supply section 12 is connected to the inlet end of the air outlet section 13, the rectification structure 2 is arranged between the outlet end of the air supply section 12 and the inlet end of the air outlet section 13; the rectification structure 2 includes a first damping mesh 21, a honeycomb 22 and a second damping mesh 23, the first damping mesh 21 and the second damping mesh 23 are symmetrically arranged on both sides of the honeycomb 22.

[0038] Working principle: The airflow generated by the centrifugal fan 11 is transported to the rectification structure 2 through the air supply section 12 of the ventilation duct 1, and is rectified in turn by the first damping net 21, the honeycomb 22 and the second damping net 23, and then transported through the air outlet section 13. The rectification structure 2 reduces the airflow deflection angle in the ventilation duct 1, improves the airflow uniformity of the air outlet section 13, and reduces the airflow turbulence intensity.

[0039] The ventilation duct of the aerodynamic performance test device is rectified by adopting a rectification structure in which the first damping net 21 and the second damping net 23 are equipped with a honeycomb 22. Compared with the ordinary rectification structure in which the damping net is arranged downstream of the honeycomb, it has a better rectification effect, improves the flow field quality of the uneven flow field caused by the centrifugal fan, further reduces the experimental error of the aerodynamic performance test bench, and improves the test accuracy.

[0040] Preferred implementation mode, as Figure 5 As shown, the ventilation duct 1 further includes a fixing lock buckle 14 , and the air supply section 12 and the air outlet section 13 are detachably connected via the fixing lock buckle 14 .

[0041] Among them, the outlet of the air supply section 12 is provided with a first card slot, and the air inlet of the air outlet section 13 is provided with a second card slot. The first card slot and the second card slot are spliced ​​into an installation slot that matches the rectification structure 2, and the rectification structure 2 can be detachably installed in the installation slot.

[0042] The ventilation duct is constructed by splicing an air supply section and an air outlet section, and is detachably connected using a fixed lock. The rectification structure is arranged between the air supply section and the air outlet section. The fixed lock can be opened to replace the rectification structure. The installation and disassembly of the rectification structure is faster, which facilitates the replacement of the rectification structure and reduces the cost of the device.

[0043] Furthermore, the device also includes a first movable frame 3 and a second movable frame 4 , the air supply section 12 is fixed on the first movable frame 3 , and the air outlet section 13 is fixed on the second movable frame 4 .

[0044] The air supply section and the air outlet section are fixed on the first movable frame and the second movable frame respectively. The distance between the air supply section and the air outlet section can be adjusted by moving the first movable frame and the second movable frame. The movement of the air supply section and the air outlet section is more labor-saving and quick, thereby improving the efficiency of installation and disassembly of the ventilation duct.

[0045] Preferred implementation mode, as Figure 3 and Figure 4 As shown, the honeycomb 22 is a circular tube honeycomb, and the slenderness ratio of the honeycomb is in the range of 11.5-12.5, and the slenderness ratio of the honeycomb is preferably 12.

[0046] Furthermore, the circular tube honeycomb includes a plurality of circular tube units, each of which is stacked, and the first damping net 21 and the second damping net 23 are clamped and installed on both sides of the circular tube honeycomb.

[0047] The rectifier structure is composed of a circular tube honeycomb clamped by two layers of damping mesh. The circular tube honeycomb can be made of easily available materials, which greatly saves costs. The unit structure of the circular tube honeycomb is stacked in a combined manner with two layers of damping mesh clamps, eliminating the need for traditional laser welding and other processes, thereby shortening construction time and saving costs.

[0048] Specifically, the air supply section 12 includes a first direct current section 121, a diffuser section 122 and a first rectifying section 123 which are connected in sequence; the cross-sectional area of ​​the first rectifying section 123 is larger than the cross-sectional area of ​​the first direct current section 121, and the centrifugal fan 11 is located at one end of the first direct current section 121 away from the diffuser section 122.

[0049] Furthermore, the air outlet section 13 includes a second rectifying section 131, a contraction section 132 and a second direct current section 133 which are connected in sequence; the cross-sectional area of ​​the second rectifying section 131 is larger than the cross-sectional area of ​​the second direct current section 133, and one end of the second rectifying section 131 away from the contraction section 132 is connected to the first rectifying section 123.

[0050] A differential pressure gauge 15 is provided in the second direct current section 133. The second direct current section 133 includes a flow guiding section and a mounting section, the flow guiding section and the mounting section are connected via a flange connector 16, and the differential pressure gauge 15 is fixed in the mounting section.

[0051] The area of ​​the rectifying structure 2 between the first rectifying section 123 and the second rectifying section 131 is increased by the diffusion section 122 of the air supply section 12 to improve the rectifying effect. The cross-sectional area of ​​the contraction section 132 in the air supply section 13 is reduced to increase the flow rate in the air supply section 13 and ensure the detection effect of the differential pressure gauge 15.

[0052] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. An aerodynamic performance test device based on a rectification structure, comprising a ventilation duct (1) and a rectification structure (2), characterized in that: The ventilation duct (1) comprises a centrifugal fan (11), an air supply section (12) and an air outlet section (13); the centrifugal fan (11) is arranged at the inlet end of the air supply section (12); the outlet end of the air supply section (12) is connected to the inlet end of the air outlet section (13); the rectifying structure (2) is arranged between the outlet end of the air supply section (12) and the inlet end of the air outlet section (13); the rectifying structure (2) comprises a first damping net (21), a honeycomb (22) and a second damping net (23); the first damping net (21) and the second damping net (23) are symmetrically arranged on both sides of the honeycomb (22).

2. The aerodynamic performance test device based on a rectifier structure according to claim 1, characterized in that: The ventilation duct (1) further comprises a fixing lock (14), and the air supply section (12) and the air outlet section (13) are detachably connected via the fixing lock (14).

3. The aerodynamic performance test device based on a rectifier structure according to claim 2, characterized in that: The outlet of the air supply section (12) is provided with a first card slot, and the air inlet of the air outlet section (13) is provided with a second card slot. The first card slot and the second card slot are spliced ​​to form an installation slot that matches the rectification structure (2), and the rectification structure (2) can be detachably installed in the installation slot.

4. The aerodynamic performance test device based on a rectifier structure according to claim 2, characterized in that: The device also comprises a first movable frame (3) and a second movable frame (4), the air supply section (12) being fixed on the first movable frame (3), and the air outlet section (13) being fixed on the second movable frame (4).

5. The aerodynamic performance test device based on a rectifier structure according to claim 1, characterized in that: The honeycomb (22) is a circular tube honeycomb, and the aspect ratio of the honeycomb is in the range of 11.5-12.

5.

6. The aerodynamic performance test device based on a rectifier structure according to claim 5, characterized in that: The circular tube honeycomb comprises a plurality of circular tube units, each of which is stacked, and the first damping net (21) and the second damping net (23) are clamped and installed on both sides of the circular tube honeycomb.

7. The aerodynamic performance test device based on a rectifier structure according to claim 1, characterized in that: The air supply section (12) comprises a first direct-flow section (121), a diffuser section (122) and a first rectifying section (123) which are connected in sequence; the cross-sectional area of ​​the first rectifying section (123) is greater than the cross-sectional area of ​​the first direct-flow section (121); and the centrifugal fan (11) is located at one end of the first direct-flow section (121) away from the diffuser section (122).

8. The aerodynamic performance test device based on a rectifier structure according to claim 7, characterized in that: The air outlet section (13) comprises a second rectifying section (131), a contraction section (132) and a second direct current section (133) which are connected in sequence; the cross-sectional area of ​​the second rectifying section (131) is greater than the cross-sectional area of ​​the second direct current section (133); and one end of the second rectifying section (131) away from the contraction section (132) is connected to the first rectifying section (123).

9. The aerodynamic performance test device based on a rectifier structure according to claim 8, characterized in that: A differential pressure gauge (15) is provided in the second direct current section (133).

10. The aerodynamic performance test device based on a rectifier structure according to claim 9, characterized in that: The second direct current section (133) comprises a flow guiding section and a mounting section, wherein the flow guiding section and the mounting section are connected via a flange connector (16), and the differential pressure gauge (15) is fixed in the mounting section.

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