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Estimating lift from wake velocity data in flapping flight

文献类型：期刊论文

作者Wang SZ(王士召)1,3; He GW(何国威)1,3; Liu TS(刘天舒)2,3
刊名JOURNAL OF FLUID MECHANICS
出版日期2019-06-10
卷号868页码:501-537
ISSN号0022-1120
关键词swimming/flying
DOI10.1017/jfm.2019.181
通讯作者Liu, Tianshu(tianshu.liu@wmich.edu)
英文摘要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.
分类号一类/力学重要期刊
URL标识查看原文
WOS关键词AERODYNAMIC FORCE ; ANIMAL FLIGHT ; VORTEX THEORY ; KINEMATICS ; MODEL ; BAT ; DYNAMICS ; THRUST ; POWER ; FLOW
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]
WOS研究方向Mechanics ; Physics
语种英语
WOS记录号WOS:000465309800001
资助机构National Natural Science Foundation of China ; Strategic Priority Research Programme ; Key Research Programme of Frontier Sciences of the Chinese Academy of Sciences
其他责任者Liu, Tianshu
源URL[http://dspace.imech.ac.cn/handle/311007/79173]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
2.Western Michigan Univ, Mech & Aerosp Engn, Kalamazoo, MI 49008 USA;
3.Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, 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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来源：力学研究所

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