Lift enhancement on spanwise oscillating flat-plates in low-Reynolds-number flows

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	Lift enhancement on spanwise oscillating flat-plates in low-Reynolds-number flows
	Wang SZ(王士召); He GW(何国威); Zhang X(张星)
刊名	Physics of Fluids
	2015
卷号	27 期号:6 页码:061901
ISSN号	1070-6631
中文摘要	Numerical simulations are performed to study the influence of spanwise oscillations on the three-dimensional flows around low-aspect-ratio flat-plates at a low Reynolds number of 300. The harmonic spanwise oscillations of the plate are controlled by two parameters: the reduced frequency k and the dimensionless amplitude Ay . It is found that in a certain range of the parameter space (k, Ay ), spanwise oscillations are effective in enhancing the average lift and augmenting the average lift-to-drag ratio. To elucidate the mechanism of lift enhancement due to the spanwise oscillations, the wake structures behind flat-plates with and without spanwise oscillations are compared. It is observed that the spanwise oscillation stabilizes the leading-edge vortex and presses it to a place very close to the upper surface. Since a leading-edgevortex corresponds to a low-pressure core, the stably attached leading-edge vortex benefits liftproduction. This lift-enhancement mechanism is also verified by using a simplified lift formula which links the lift force with the Lamb vector term. The imposed spanwise oscillation is found to enhance the vorticity transport along the spanwise direction, which in turn improves thestability of the leading-edge vortex. The results of this study provide new insight into the counterintuitive high-lift in the gliding flights of tree snakes.
分类号	一类/力学重要期刊
类目[WOS]	Mechanics ; Physics, Fluids & Plasmas
研究领域[WOS]	Mechanics ; Physics
关键词[WOS]	LEADING-EDGE VORTICES ; IMMERSED BOUNDARY METHOD ; CHRYSOPELEA-PARADISI ; GLIDING FLIGHT ; WAKE STRUCTURE ; FLYING SNAKE ; WINGS ; PERFORMANCE ; KINEMATICS
收录类别	SCI ; EI
原文出处	http://dx.doi.org/10.1063/1.4922236
语种	英语
WOS记录号	WOS:000357688800007
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/50520]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Wang SZ,He GW,Zhang X. Lift enhancement on spanwise oscillating flat-plates in low-Reynolds-number flows[J]. Physics of Fluids,2015,27(6):061901.
APA	Wang SZ,He GW,&Zhang X.(2015).Lift enhancement on spanwise oscillating flat-plates in low-Reynolds-number flows.Physics of Fluids,27(6),061901.
MLA	Wang SZ,et al."Lift enhancement on spanwise oscillating flat-plates in low-Reynolds-number flows".Physics of Fluids 27.6(2015):061901.