Effect of tip vortices on membrane vibration of flexible wings with different aspect ratios
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Tarih
2016
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
E D P Sciences
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
In this study, the effect of the aspect ratio on the aerodynamics characteristic of flexible membrane wings with different aspect ratios (AR = 1 and AR = 3) is experimentally investigated at Reynolds number of 25000. Time accurate measurements of membrane deformation using Digital Image Correlation system (DIC) is carried out while normal forces of the wing will be measured by helping a load-cell system and flow on the wing was visualized by means of smoke wire technic. The characteristics of high aspect ratio wings are shown to be affected by leading edge separation bubbles at low Reynolds number. It is concluded that the camber of membrane wing excites the separated shear layer and this situation increases the lift coefficient relatively more as compared to rigid wings. In membrane wings with low aspect ratio, unsteadiness included tip vortices and vortex shedding, and the combination of tip vortices and vortex shedding causes complex unsteady deformations of these membrane wings. The characteristic of high aspect ratio wings was shown to be affected by leading edge separation bubbles at low Reynolds numbers whereas the deformations of flexible wing with low aspect ratio affected by tip vortices and leading edge separation bubbles.
Açıklama
10th Anniversary International Conference on Experimental Fluid Mechanics -- NOV 17-20, 2015 -- Prague, CZECH REPUBLIC
WOS:000400395300030
WOS:000400395300030
Anahtar Kelimeler
Kaynak
EFM15 - Experimental Fluid Mechanics 2015
WoS Q Değeri
N/A
Scopus Q Değeri
N/A
Cilt
114
