Scaling law and enhancement of lift generation of an insect-size hovering flexible wing

Author:

Kang Chang-kwon1,Shyy Wei2

Affiliation:

1. Department of Aerospace Engineering, University of Michigan, Ann Arbor, MI 48109, USA

2. Department of Mechanical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong

Abstract

We report a comprehensive scaling law and novel lift generation mechanisms relevant to the aerodynamic functions of structural flexibility in insect flight. Using a Navier–Stokes equation solver, fully coupled to a structural dynamics solver, we consider the hovering motion of a wing of insect size, in which the dynamics of fluid–structure interaction leads to passive wing rotation. Lift generated on the flexible wing scales with the relative shape deformation parameter, whereas the optimal lift is obtained when the wing deformation synchronizes with the imposed translation, consistent with previously reported observations for fruit flies and honeybees. Systematic comparisons with rigid wings illustrate that the nonlinear response in wing motion results in a greater peak angle compared with a simple harmonic motion, yielding higher lift. Moreover, the compliant wing streamlines its shape via camber deformation to mitigate the nonlinear lift-degrading wing–wake interaction to further enhance lift. These bioinspired aeroelastic mechanisms can be used in the development of flapping wing micro-robots.

Publisher

The Royal Society

Subject

Biomedical Engineering,Biochemistry,Biomaterials,Bioengineering,Biophysics,Biotechnology

Reference43 articles.

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2. Leading-edge vortices in insect flight

3. Wing Rotation and the Aerodynamic Basis of Insect Flight

4. The influence of wing–wake interactions on the production of aerodynamic forces in flapping flight

5. The aerodynamic effects of wing rotation and a revised quasi-steady model of flapping flight;Sane S;J. Exp. Biol.,2002

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