Estimating lift from wake velocity data in flapping flight

doi:10.1017/jfm.2019.181

IMECH-IR > 非线性力学国家重点实验室

	Estimating lift from wake velocity data in flapping flight
	Wang SZ(王士召)1,3 ; He GW(何国威)1,3 ; Liu TS(刘天舒)1,2
通讯作者	Liu, Tianshu(tianshu.liu@wmich.edu)
发表期刊	JOURNAL OF FLUID MECHANICS
	2019-06-10
卷号	868 页码:501-537
ISSN	0022-1120
摘要	The application of the Kutta-Joukowski (KJ) theorem to estimating the lift of a flying animal based on wake velocity fields often leads to significant underprediction of the lift, which is known as the wake momentum paradox. This work attempts to answer the puzzling question on whether the KJ theorem is legitimate in its use for complex viscous unsteady wakes generated by flapping wings. The limitations in applying the KJ theorem to flapping wings are quantitatively examined through numerical simulations of viscous incompressible flows over three flapping wing models. The three flapping wing models studied in this work are a flapping wing with a fixed wingspan, a flapping wing with a dynamically changing wingspan and a dihedral flapping wing. The KJ theorem fails to give a satisfactory prediction of the time-averaged lift unless an effective span length is correctly computed. We propose a wake-sectional Kutta-Joukowski (WS-KJ) model to predict the time-averaged lift, where the effective span length is computed based on the time-averaged distance between the streamwise vorticity centroids in the right and left half sides of the Trefftz plane. The WS-KJ model incorporates the spatial evolutionary effects of the complex vortex structures in the wake and significantly improves the prediction of the time-averaged lift. The physical foundation for such improvement is explored. In addition, the time-dependent amplitude and phase changes of the unsteady lift are discussed as the fluid acceleration effect.
关键词	swimming/flying
DOI	10.1017/jfm.2019.181
URL	查看原文
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000465309800001
关键词[WOS]	AERODYNAMIC FORCE ; ANIMAL FLIGHT ; VORTEX THEORY ; KINEMATICS ; MODEL ; BAT ; DYNAMICS ; THRUST ; POWER ; FLOW
WOS研究方向	Mechanics ; Physics
WOS类目	Mechanics ; Physics, Fluids & Plasmas
资助项目	National Natural Science Foundation of China[91752118] ; National Natural Science Foundation of China[11672305] ; National Natural Science Foundation of China[11232011] ; National Natural Science Foundation of China[11572331] ; Strategic Priority Research Programme[XDB22040104] ; Key Research Programme of Frontier Sciences of the Chinese Academy of Sciences[QYZDJ-SSW-SYS002]
项目资助者	National Natural Science Foundation of China ; Strategic Priority Research Programme ; Key Research Programme of Frontier Sciences of the Chinese Academy of Sciences
论文分区	一类/力学重要期刊
力学所作者排名	1
RpAuthor	Liu, Tianshu
引用统计	被引频次：18[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/79173
专题	非线性力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China; 2.Western Michigan Univ, Mech & Aerosp Engn, Kalamazoo, MI 49008 USA; 3.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wang SZ,He GW,Liu TS. Estimating lift from wake velocity data in flapping flight[J]. JOURNAL OF FLUID MECHANICS,2019,868:501-537.
APA	王士召,何国威,&刘天舒.(2019).Estimating lift from wake velocity data in flapping flight.JOURNAL OF FLUID MECHANICS,868,501-537.
MLA	王士召,et al."Estimating lift from wake velocity data in flapping flight".JOURNAL OF FLUID MECHANICS 868(2019):501-537.

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