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김주하

Kim, Jooha
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dc.citation.startPage 9914 -
dc.citation.title SCIENTIFIC REPORTS -
dc.citation.volume 5 -
dc.contributor.author Lee, Sang-im -
dc.contributor.author Kim, Jooha -
dc.contributor.author Park, Hyungmin -
dc.contributor.author Jablonski, Piotr G. -
dc.contributor.author Choi, Haecheon -
dc.date.accessioned 2023-12-22T01:13:32Z -
dc.date.available 2023-12-22T01:13:32Z -
dc.date.created 2015-11-09 -
dc.date.issued 2015-05 -
dc.description.abstract The alula is a small structure located at the joint between the hand-wing and arm-wing of birds and is known to be used in slow flight with high angles of attack such as landing. It is assumed to function similarly to a leading-edge slat that increases lift and delays stall. However, in spite of its universal presence in flying birds and the wide acceptance of stall delay as its main function, how the alula delays the stall and aids the flight of birds remains unclear. Here, we investigated the function of alula on the aerodynamic performance of avian wings based on data from flight tasks and wind-tunnel experiments. With the alula, the birds performed steeper descending flights with greater changes in body orientation. Force measurements revealed that the alula increases the lift and often delays the stall. Digital particle image velocimetry showed that these effects are caused by the streamwise vortex, formed at the tip of the alula, that induces strong downwash and suppresses the flow separation over the wing surface. This is the first experimental evidence that the alula functions as a vortex generator that increases the lift force and enhances manoeuvrability in flights at high angles of attack. -
dc.identifier.bibliographicCitation SCIENTIFIC REPORTS, v.5, pp.9914 -
dc.identifier.doi 10.1038/srep09914 -
dc.identifier.issn 2045-2322 -
dc.identifier.scopusid 2-s2.0-84929000064 -
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/17803 -
dc.identifier.url http://www.nature.com/articles/srep09914 -
dc.identifier.wosid 000354109900001 -
dc.language 영어 -
dc.publisher NATURE PUBLISHING GROUP -
dc.title The function of the alula in avian flight -
dc.type Article -
dc.description.journalRegisteredClass scie -
dc.description.journalRegisteredClass scopus -

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