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	Frequency characteristics of coherent structures and their excitations in small aspect-ratio rectangular jets using large eddy simulation
	Jiang, P. ; Guo, Y. C. ; Chan, C. K. ; Lin, W. Y.
	2010-05-07 ; 2010-05-07
关键词	NUMERICAL SIMULATIONS NONCIRCULAR JETS TURBULENT JET ELLIPTIC JET SQUARE JETS FLOW MODEL VELOCITY Computer Science, Interdisciplinary Applications Mechanics
中文摘要	Large eddy simulations of air jets from small aspect-ratio (AR) rectangular nozzles are performed with the dynamic subgrid-scale closure. Mean streamwise velocity profiles are in good agreement with experimental data. Results indicate that vortices originating from the longer side of the rectangular jet are dominant compared with that from the shorter side. Furthermore, entrainment is slight in the potential core, and significantly increases in the following vortex roll-up region. However, the jet entrains more with smaller AR. Power spectral density of the streamwise velocity indicates that the oscillations consist of a series of sub-harmonic frequencies, with the predominant frequencies reducing along the axial direction. Analysis shows that among multiple frequencies, there is a characteristic one at f = 0.22 which dominates the near field of the rectangular jet. The characteristic frequency is independent of velocity components, aspect ratios of the jet and locations. Based on this characteristic frequency, calculations with different forced frequencies imposed on the inlet nozzle are carried out. Results indicate that when the forced frequency is approximately equal to the characteristic frequency, development of the coherent structures is the most intense in the near field, and exhibits the strongest entrainment. (c) 2006 Elsevier Ltd. All rights reserved.
语种	英语 ; 英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD ; OXFORD ; THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/16282]
专题	清华大学
推荐引用方式 GB/T 7714	Jiang, P.,Guo, Y. C.,Chan, C. K.,et al. Frequency characteristics of coherent structures and their excitations in small aspect-ratio rectangular jets using large eddy simulation[J],2010, 2010.
APA	Jiang, P.,Guo, Y. C.,Chan, C. K.,&Lin, W. Y..(2010).Frequency characteristics of coherent structures and their excitations in small aspect-ratio rectangular jets using large eddy simulation..
MLA	Jiang, P.,et al."Frequency characteristics of coherent structures and their excitations in small aspect-ratio rectangular jets using large eddy simulation".(2010).

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