Aerodynamic Characteristics,Power Requirements and Camber Effects of the Pitching-Down Flapping Hovering

作     者：Peng Bai,Er-jie Cui,Hui-ling ZhanChina Academy of Aerospace Aerodynamics,Beijing 100074,P.R.China 

作者机构：China Academy of Aerospace Aerodynamics Beijing P. R. China 

出 版 物：《Journal of Bionic Engineering》 (仿生工程学报（英文版）)

年 卷 期：2009年第6卷第2期

页      面：120-134页

核心收录：

学科分类：0710[理学-生物学] 0831[工学-生物医学工程（可授工学、理学、医学学位）] 080103[工学-流体力学] 08[工学] 080104[工学-工程力学] 0836[工学-生物工程] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

主　　题：aerodynamic characteristics flapping wing power requirements camber effect pitching-down-flapping MAVs 

摘      要：The pitching-down flapping is a new type of bionic flapping,which was invented by the author based on previous studies on the aerodynamic mechanisms of fruit fly(pitching-up)*** motivation of this invention is to improve the aerodynamic characteristics of flapping Micro Air Vehicles(MAVs).In this paper the pitching-down flapping is briefly *** major works include:(1)Computing the power requirements of pitching-down flapping in three modes(advanced,symmetrical, delayed),which were compared with those of pitching-up flapping;(2)Investigating the effects of translational acceleration time,Δτ_t,and rotational time,Δτ_r,at the end of a stroke,and the angle of attack,α,in the middle of a stroke on the aerodynamic characteristics in symmetrical mode;(3)Investigating the effect of camber on pitching-down *** the above works, conclusions can be drawn that:(1)Compared with the pitching-up flapping,the pitching-down flapping can greatly reduce the time-averaged power requirements;(2)The increase in Δτt and the decrease in Δτ_r can increase both the lift and drag coefficients, but the time-averaged ratio of lift to drag changes a *** α has significant effect on the aerodynamic characteristics of the pitching-down flapping;(3)The positive camber can effectively increase the lift coefficient and the ratio of lift to drag.