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aerodynamics of Ascending Flight in Fruit Flies

Journal of Bionic Engineering 2017年第1期14卷 75-87页

作者： Xueguang Meng Yanpeng Liu Mao Sun Institute of Fluid Mechanics Beijing University of A eronautics and Astronautics Beijing 100191 China

As a very basic flight mode, ascending flight is obviously of great importance to all kinds of manmade and natural fliers. Yet, for the most commonly seen fliers - insects, researches on this flight mode are rare. In this paper, we combined both experimental measurements and numerical simulations to investigate the kinematical characteristics, aerodynamic performance and power requirement of ascending flight in fruit flies （Drosophila virilis）. The flies ascend at an advance ratio of about 0.12. The most significant characteristic of ascending flight is larger stroke amplitude compared to hovering, while the other kinematics is very similar. From an aerodynamics point of view, this increased stroke amplitude is needed to overcome the negative effects of＂downwash flow＂, caused by the upward motion of the fly. Same as hovering, the ascending fruit flies utilize delayed stall and fast pitching-up mechanisms to generate the majority of the lift required for balancing the weight and body drag. By using a larger stroke-amplitude to overcome the negative effects of＂downwash flow＂, larger energy cost （about 20%） than that of equivalent hovering is required.

关键词： fruit fly ascending flight Computational Fluid Dynamics (CFD) low reynolds number aerodynamics power requirement

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aerodynamics of climbing flight in fruit flies

Aerodynamics of climbing flight in fruit flies

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中国力学大会-2017暨庆祝中国力学学会成立60周年大会

作者： Bi Hongxiao Liu Yanpeng Sun Mao School of Aeronautic Science and Engineering Beihang University Institute of Fluid Mechanics Beihang University

aerodynamics of insects’ hovering,forward and ascending flight are well known up to *** for another common flight mode – climbing along a tilting path,there are few *** this research,we study the climbing flight of fruit flies(Drosophila virilis) along about 45° upward path,which is considered as *** experimental measurements and numerical simulations are used to investigate the kinematical characteristics and aerodynamic performances of such flight *** a flight mode similar to both ascending and forward flight,climbing along a 45°path has its specific kinematical *** stroke amplitude,wingbeat frequency and pitch angle of the wing are noticeably larger than that of hovering,which is needed to overcome the negative effects come along with the "downwash flow" that is induced by the upward *** stroke plane is slightly forward-tilting in order to provide enough thrust to overcome the drag caused by the forward *** kinematics are quite similar to hovering *** stall and fast pitching-up rotation mechanisms are utilized to generate most of the vertical force required for balancing the weight and body drag.

关键词： fruit fly climbing flight Computational Fluid Dynamics (CFD) low reynolds number aerodynamics

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