Aerodynamic mechanism of forces generated by twisting model-wing in bat flapping flight  

作　　者：管子武 余永亮 

机构地区：[1]Department of Modern Mechanics, University of Science and Technology of China [2]The Laboratory for Biomechanics of Animal Locomotion,University of Chinese Academy of Sciences

出　　处：《Applied Mathematics and Mechanics(English Edition)》2014年第12期1607-1618,共12页应用数学和力学（英文版）

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

摘　　要：The aerodynamic mechanism of the bat wing membrane Mong the lateral border of its body is studied. The twist-morphing that alters the angle of attack （AOA） along the span-wise direction is observed widely during bat flapping flight. An assumption is made that the linearly distributed AOA is along the span-wise direction. The plate with the aspect ratio of 3 is used to model a bat wing. A three-dimensional （3D） unsteady panel method is used to predict the aerodynamic forces generated by the flapping plate with leading edge separation. It is found that, relative to the rigid wing flapping, twisting motion can increase the averaged lift by as much as 25% and produce thrust instead of drag. Furthermore, the aerodynamic forces （lift/drag） generated by a twisting plate-wing are similar to those of a pitching rigid-wing, meaning that the twisting in bat flight has the same function as the supination/pronation motion in insect flight.The aerodynamic mechanism of the bat wing membrane Mong the lateral border of its body is studied. The twist-morphing that alters the angle of attack （AOA） along the span-wise direction is observed widely during bat flapping flight. An assumption is made that the linearly distributed AOA is along the span-wise direction. The plate with the aspect ratio of 3 is used to model a bat wing. A three-dimensional （3D） unsteady panel method is used to predict the aerodynamic forces generated by the flapping plate with leading edge separation. It is found that, relative to the rigid wing flapping, twisting motion can increase the averaged lift by as much as 25% and produce thrust instead of drag. Furthermore, the aerodynamic forces （lift/drag） generated by a twisting plate-wing are similar to those of a pitching rigid-wing, meaning that the twisting in bat flight has the same function as the supination/pronation motion in insect flight.

关 键 词：bat wing TWISTING panel method aerodynamic mechanism 

分 类 号：V211[航空宇航科学与技术—航空宇航推进理论与工程]