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Lift enhancement by bats' dynamically changing wingspan
Wang SZ(王士召); Zhang X(张星); He GW(何国威); Liu TS; He GW(何国威)
Source PublicationJournal of Royal Society Inerface

This paper elucidates the aerodynamic role of the dynamically changing wingspan in bat flight. Based on direct numerical simulations of the flow over a slow-flying bat, it is found that the dynamically changing wingspan can significantly enhance the lift. Further, an analysis of flow structures and lift decomposition reveal that the elevated vortex lift associated with the leading-edge vortices intensified by the dynamically changing wingspan considerably contributed to enhancement of the time-averaged lift. The nonlinear interaction between the dynamically changing wing and the vortical structures plays an important role in the lift enhancement of a flying bat in addition to the geometrical effect of changing the lifting-surface area in a flapping cycle. In addition, the dynamically changing wingspan leads to the higher efficiency in terms of generating lift for a given amount of the mechanical energy consumed in flight.

KeywordBat Flight Flapping Flight Dynamically Changing Wingspan Unsteady Aerodynamics
Subject Area力学
Indexed BySCI ; EI
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorHe GW(何国威)
Recommended Citation
GB/T 7714
Wang SZ,Zhang X,He GW,et al. Lift enhancement by bats' dynamically changing wingspan[J]. Journal of Royal Society Inerface,2015,12:20150821.
APA Wang SZ,Zhang X,He GW,Liu TS,&He GW.(2015).Lift enhancement by bats' dynamically changing wingspan.Journal of Royal Society Inerface,12,20150821.
MLA Wang SZ,et al."Lift enhancement by bats' dynamically changing wingspan".Journal of Royal Society Inerface 12(2015):20150821.
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