Aerodynamics and mechanisms of elementary morphing models for flapping wing in forward flight of bat

Ziwu GUAN, Yongliang YU

doi:10.1007/s10483-015-1931-7

Applied Mathematics and Mechanics >

2015 , Vol. 36 >Issue 5: 669 - 680

DOI: https://doi.org/10.1007/s10483-015-1931-7

Articles

Aerodynamics and mechanisms of elementary morphing models for flapping wing in forward flight of bat

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1. The Laboratory for Biomechanics of Animal Locomotion, University of Chinese Academy of Sciences, Beijing 100049, China;
2. Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, China

Received date: 2014-09-07

Revised date: 2015-01-23

Online published: 2015-05-01

Supported by

Project supported by the National Natural Science Foundation of China (No. 10602061)

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Abstract

Large active wing deformation is a significant way to generate high aerodynamic forces required in bat's flapping flight. Besides the twisting, elementary morphing models of a bat wing are proposed, including wing-bending in the spanwise direction, wing-cambering in the chordwise direction, and wing area-changing. A plate of aspect ratio 3 is used to model a bat wing, and a three-dimensional unsteady panel method is used to predict the aerodynamic forces. It is found that the cambering model has great positive influence on the lift, followed by the area-changing model and then the bending model. Further study indicates that the vortex control is a main mechanism to produce high aerodynamic forces. The mechanisms of aerodynamic force enhancement are asymmetry of the cambered wing and amplification effects of wing area-changing and wing bending. Lift and thrust are generated mainly during downstroke, and they are almost negligible during upstroke by the integrated morphing model-wing.

Key words： bending; cambering; bat wing; aerodynamic force; area-changing

Cite this article

Ziwu GUAN, Yongliang YU . Aerodynamics and mechanisms of elementary morphing models for flapping wing in forward flight of bat[J]. Applied Mathematics and Mechanics, 2015 , 36(5) : 669 -680 . DOI: 10.1007/s10483-015-1931-7

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