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	Two-dimensionality of a cantilevered-cylinder wake in the presence of an oscillating upstream cylinder
	Xu, S. J. ; Zhou, Y. ; Tu, J. Y.
	2010-05-10 ; 2010-05-10
关键词	2 CIRCULAR-CYLINDERS SPANWISE CORRELATION FLUCTUATING LIFT VORTEX FORMATION FORCED SYSTEM FLOW TANDEM ARRANGEMENT MOMENTUM NUMBERS Engineering, Mechanical Mechanics
中文摘要	The effect of a longitudinally oscillating cylinder on the two-dimensionality of flow around a downstream cylinder is studied based on a two-point correlation measured using two hot-wires. The oscillation amplitude is A/d = 0.472 and, = 0.0372 and 0.186, where d is the cylinder diameter and f(s) the frequency of natural vortex the oscillation frequency f(e)/f(s) shedding from an isolated stationary cylinder. Three centre-to-centre spacing (L) ratios of the two cylinders were examined, i.e., L/d = 1.8, 2.5 and 4.8, representing three typical flow regimes. The experiment was conducted at a Reynolds number (Re) of 5920, based on d and the free-stream velocity. It is found that the spanwise correlation of the flow depends on not only the oscillation but also the flow regimes. At L/d = 1.8, the correlation is strongest among the three regimes, but worst in the co-shedding regime (L/d = 4.8). The upstream cylinder oscillation improves the spanwise correlation of the flow in the gap of the cylinders, irrespective of regimes, especially for L/d = 1.8 and 2.5, but impairs that behind the cylinders for L/d = 1.8 and 2.5 due to a change in the flow regime. A theoretical analysis based on the boundary vorticity theory indicates that the oscillation increases the vorticity flux, in particular, in the spanwise direction between the cylinders, resulting in a significantly improved spanwise correlation, though this increase is negligibly small behind the downstream cylinder. (c) 2007 Elsevier Ltd. All rights reserved.
语种	英语 ; 英语
出版者	ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD ; LONDON ; 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/22539]
专题	清华大学
推荐引用方式 GB/T 7714	Xu, S. J.,Zhou, Y.,Tu, J. Y.. Two-dimensionality of a cantilevered-cylinder wake in the presence of an oscillating upstream cylinder[J],2010, 2010.
APA	Xu, S. J.,Zhou, Y.,&Tu, J. Y..(2010).Two-dimensionality of a cantilevered-cylinder wake in the presence of an oscillating upstream cylinder..
MLA	Xu, S. J.,et al."Two-dimensionality of a cantilevered-cylinder wake in the presence of an oscillating upstream cylinder".(2010).

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