Aerodynamics of a translating comb-like plate inspired by a fairyfly wing = 페어리 플라이 날개 모사 빗 모양 모델의 공력 특성

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Unlike the smooth wings of common insects or birds, micro-scale insects such as the fairyfly have a distinctive wing geometry, comprised of a frame with several bristles. Motivated by this peculiar wing geometry, we experimentally investigated the flow structure of a translating comb-like wing for a wide range of gap size, angle of attack and Reynolds number, Re = O(10) - O($10^3$), and the correlation of these parameters with aerodynamic performance. The flow structures of a smooth plate without a gap and a comb-like plate are significantly different at high Reynolds number, while little difference was observed at the low Reynolds number of $O(10)$. At low Reynolds number, shear layers that were generated at the edges of the tooth of the comb-like plate strongly diffuse and eventually block a gap. This gap blockage increases the effective surface area of the plate and alters the formation of leading-edge and trailing-edge vortices. As a result, the comb-like plate generates larger aerodynamic force per unit area than the smooth plate. In addition to a quasi-steady phase after the comb-like plate travels several chords, we also studied a starting phase of the shear layer development when the comb-like plate begins to translate from rest. While a plate with small gap size can generate aerodynamic force at the starting phase as effectively as at the quasi-steady phase, the aerodynamic force drops noticeably for a plate with a large gap, because the diffusion of the developing shear layers is not enough to block the gap.
Advisors
Kim, Dae Gyoumresearcher김대겸researcher
Description
한국과학기술원 :기계공학과,
Publisher
한국과학기술원
Issue Date
2017
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 기계공학과, 2017.8,[iv, 21 p. :]

Keywords

Fairyfly▼aComb-like wing▼aBristled wing; 페어리 플라이▼a빗모양 날개▼a강모 날개

URI
http://hdl.handle.net/10203/242885
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=718547&flag=dissertation
Appears in Collection
ME-Theses_Master(석사논문)
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