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	Investigation of feedback loop in the impinging jet
	Gan Caijun ; He Feng ; Yao Zhaohui ; Yang Jinglong
	2010-10-12 ; 2010-10-12
关键词	Theoretical or Mathematical/ acoustic wave propagation aerodynamics aircraft jets noise abatement nozzles velocimeters vortices wavelet transforms/ impinging jet short take-off landing vertical landing aircraft air nozzle vortex structure feedback wave propagation wavelet analysis acoustic analogy particle image velocimetry biorthogonal wavelet transform frequency distribution discrete tone large-scale structure coustic source/ A4755C Jets in fluid dynamics A4350 Acoustic noise, its effects and control A4730 Rotational flow, vortices, buoyancy and other flows involving body forces A4780 Measurement instrumentation and techniques for fluid dynamics A0230 Function theory, analysis A4735 Waves in fluid dynamics A4755E Nozzles A4785 Applied fluid mechanics A4740 Compressible flows shock and detonation phenomena
中文摘要	It is important to take noise control of impinging jets in many engineering fields, such as a short take-off and vertical landing (SVTOL) aircraft as well as air nozzle. In general, the impinging jet noise is associated with the relationship between the impinging tone and the scale of vortex structure, and the propagating direction of feedback waves. In the present study, the propagation direction of impinging tone was investigated with wavelet analysis and acoustic analogy. The velocity field of impinging jet was obtained by particle image velocimetry (PIV) technique and decomposed by means of biorthogonal wavelet transform. The frequency distribution of discrete tone was obtained from its noise field. The results show that large-scale structure can be viewed as "coustic source" of discrete tone. Moreover, the direction of upstream-propagating feedback waves is about 60 degrees oriented from the impinging plane and agrees with Ho's experimental results.
语种	中文
出版者	Chinese Journal of Mechanics Press ; China
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/79039]
专题	清华大学
推荐引用方式 GB/T 7714	Gan Caijun,He Feng,Yao Zhaohui,et al. Investigation of feedback loop in the impinging jet[J],2010, 2010.
APA	Gan Caijun,He Feng,Yao Zhaohui,&Yang Jinglong.(2010).Investigation of feedback loop in the impinging jet..
MLA	Gan Caijun,et al."Investigation of feedback loop in the impinging jet".(2010).

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