Throat structure capable of improving Reynolds number of tube wind tunnel test

Abstract

The invention relates to a throat structure capable of improving the Reynolds number of a tube wind tunnel test. An upstream section, a transition section and a downstream section constitute the throat structure from left to right; the upstream section, the transition section and the downstream section are fixed together by flanges; the throat structure is arranged between the tube wind tunnel driving section and test section of a wind tunnel test; the throat structure at the upstream section is a subsonic speed expansion section in a conical structure form; the middle of the transition section comprises a multi-throat parallel spray tube structure; the middle of the downstream section is a contracted downstream spray tube; and the right end of the downstream section is a supersonic expansion section. According to the throat structure of the present invention, it only requires to make local modification on a tube wind tunnel, and requirements can be met by means of an aerodynamic principle; and a rectifying device is additionally arranged in the transition section, so that the startup time of the wind tunnel can be shortened, and the quality of the flow field of the test section can be improved.

Description

technical field [0001] The invention relates to the field of tube wind tunnel equipment, in particular to a throat structure for increasing the Reynolds number of a tube wind tunnel test. Background technique [0002] The tube wind tunnel is a kind of high Ma number pulse type ground test equipment. The tunnel body consists of a long equal-diameter tube, one end is sealed, and the other end is equipped with a diaphragm or quick valve. The downstream is connected to the nozzle, test section and vacuum tank. composition. The effective test time of the pipe wind tunnel depends on the length and inner diameter of the pipe body. When the diaphragm is broken or the valve is opened, the high-pressure gas in the straight section will expand to the vacuum ball downstream of the nozzle, generating a beam of expansion waves. There will be a period of uniform airflow after the wave, which can be used for model tests and measurements. [0003] Due to the advantages of low construction ...

AI Technical Summary

Problems solved by technology

[0006] The present invention proposes a throat structure for increasing the Reynolds number of the tube wind tunnel test, so as to solve the problem that the test Reynolds number is low during the low Ma number operation in the prior art in the design of the wide Ma number tube wind tunnel

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