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

doi:10.1007/s10483-015-1931-7

Applied Mathematics and Mechanics (English Edition) ›› 2015, Vol. 36 ›› Issue (5): 669-680.doi: https://doi.org/10.1007/s10483-015-1931-7

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

Ziwu GUAN^1,2, Yongliang YU¹

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

收稿日期:2014-09-07 修回日期:2015-01-23 出版日期:2015-05-01 发布日期:2015-05-01
通讯作者: Yongliang YU E-mail:ylyu@ucas.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (No. 10602061)

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

Ziwu GUAN^1,2, Yongliang YU¹

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:2014-09-07 Revised:2015-01-23 Online:2015-05-01 Published:2015-05-01
Contact: Yongliang YU E-mail:ylyu@ucas.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (No. 10602061)

摘要/Abstract

摘要： 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.

关键词: area-changing, bat wing, bending, cambering, aerodynamic force

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

中图分类号:

O351.2
O355

Ziwu GUAN, Yongliang YU. Aerodynamics and mechanisms of elementary morphing models for flapping wing in forward flight of bat[J]. Applied Mathematics and Mechanics (English Edition), 2015, 36(5): 669-680.

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

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

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