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摘要:
This study focuses on a noise emitted from a radial underexpanded jet. The underexpanded jet is well known as one of supersonic jets and it is formed when the pressure ratio across a convergent nozzle is more than the critical value. The underexpanded jet has been used in many fields, such a propulsion of rocket, laser cutting and a glass tempering process. Such jet is exhausted from a circular nozzle. The expansion wave, the compression wave and the shock wave are periodically formed in the jet, which leads to quasi-periodical shock-cell structure. On the other hand, an underexpanded jet radially issues from intake and exhaust valves of an internal combustion engine and a pressure control valve. The radial underexpanded jet does not have the quasi- periodical shock-cell structure such as the jet from the circular nozzle, its cell length decreasing along jet axis. In this study, an underexpanded jet radially discharged from a circular slit nozzle, which consists of two circular tubes, is experimentally examined for different nozzle pressure ratios. The jet structure is visualized using Schlieren method and a noise emitted from the jet is measured. Typically, the shock associated broadband noise is analyzed and a relation between the jet structure and the radiation noise frequency is discussed. As a result, it is found that the broadband noise lies on lower frequency than a screech tone and that the 1st cell length plays an important role in broadband noise radiation.
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篇名 A Study on Broad Band Noise Emitted from Underexpanded Radial Jet
来源期刊 流体动力学(英文) 学科 医学
关键词 BROADBAND Noise Shock WAVE Underexpanded JET VISUALIZATION
年,卷(期) 2019,(1) 所属期刊栏目
研究方向 页码范围 72-81
页数 10页 分类号 R73
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BROADBAND
Noise
Shock
WAVE
Underexpanded
JET
VISUALIZATION
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研究来源
研究分支
研究去脉
引文网络交叉学科
相关学者/机构
期刊影响力
流体动力学(英文)
季刊
2165-3852
武汉市江夏区汤逊湖北路38号光谷总部空间
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302
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