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Collection opening structure for open closed-circuit wind tunnel

A collection port and wind tunnel technology, which is applied in the field of collection port structure of open-type automotive aeroacoustic wind tunnels, and can solve problems such as affecting and destroying wind tunnel structures.

Inactive Publication Date: 2007-11-14
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The experience of foreign wind tunnel construction shows that if the low-frequency flutter phenomenon cannot be effectively suppressed, it will not only have a serious impact on related wind tunnel experiments, but may even damage the structure of the wind tunnel itself.
Since people are not very clear about the mechanism of such flutter, various control methods have emerged. However, different control methods have different effects on different wind tunnels, and each has its own advantages and disadvantages.

Method used

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  • Collection opening structure for open closed-circuit wind tunnel
  • Collection opening structure for open closed-circuit wind tunnel
  • Collection opening structure for open closed-circuit wind tunnel

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Embodiment Construction

[0020] As shown in Figure 2, the present invention is a collection port structure of an open backflow type wind tunnel, including an upper deflector 1 and two side deflectors 2, each deflector can adjust the angle, which can suppress Low frequency chatter. But after the deflector adjusts the angle, a gap will be formed between the upper deflector 1 and the two side deflectors 2, and the present invention is provided with a sealing member 3 in these two gaps, thereby sealing the gap. The closing part 3 can be a wedge-shaped block, the upper and lower sides of the wedge-shaped block are respectively connected with the upper deflector and the side deflector through sealant, or it can be a telescopic slide plate, a telescopic folding plate, etc.

[0021] The use of the present invention produces different suppression effects on low-frequency flutter amplitudes at different angles of the collection port, and the effect of reducing low-frequency flutter can be measured by calculatin...

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Abstract

The invention discloses an open-mouth returned wind tunnel collection structure, including a piece of up plate and two lateral plates. Every plate can adjust angle, and there is the gap between the plates in a closed case. This invention sets up a closed case to be closed because of the adjustment angle formed the gap between the up plate and side plate, which can stop the flow of jet role again, and make the collection more airflow can be collected. At the same time, the closed case can reduce the reflection in the room downstream airflow and thus achieve a lower value of the low-frequency amplitude flutter role.

Description

technical field [0001] The invention belongs to the technical field of automobile wind tunnels, and in particular relates to a collection opening structure of an open-type automobile aeroacoustic wind tunnel. Background technique [0002] The speed of development of expressways and high-speed rail transit is changing with each passing day. In addition to automobiles, other high-speed rail transit vehicles (such as high-speed trains, maglev trains, etc.) are also emerging. In this way, design lightweight cars and high-speed rail transit rolling stock with good aerodynamic characteristics, improve the aerodynamic stability of high-speed vehicles, improve their power and economy and the inflow characteristics of the cab, and improve the performance of engines and braking systems. The effectiveness of reducing aerodynamic noise has become a key research and development content for such vehicles and high-speed rail vehicles. Vehicle wind tunnel test equipment plays an irreplacea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/04
Inventor 万钢杨志刚王毅刚郑志强
Owner TONGJI UNIV