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昆虫垂直下飞时的气动特性

发表时间:2014-02-15  浏览量:1556  下载量:592
全部作者: 梁彬,孙茂
作者单位: 北京航空航天大学航空科学与工程学院
摘 要: 通过数值求解N-S方程,研究模型昆虫在不同速度垂直下飞时翅膀尾迹对其气动性能的影响。选取了悬停,无量纲下飞速度分别为0.1,0.2,0.5等几种运动状态作为研究对象。结果表明:悬停飞行和小速度下飞时尾迹影响较小,平均气动力和力矩(拍动周期上的时间平均值)的变化小于2%;下飞速度较大时,由于翅膀进入了先前拍动所遗留的尾迹中,平均气动力和力矩形成振荡,但不会对昆虫的稳定飞行造成太大影响。这些结果对昆虫飞行性能的研究以及仿昆虫式微型飞行器(micro air vehicle, MAV)设计具有一定的指导意义。
关 键 词: 流体力学;昆虫;下飞;气动力;飞行稳定性
Title: Aerodynamic force of insect in downward flight
Author: LIANG Bin, SUN Mao
Organization: School of Aeronautic Science and Engineering, Beihang University
Abstract: The effects of wake on the aerodynamic force production of model insect wings in stroking motion were investigated when the insect hovering and downward flight, using the method of numerically solving the Navier-Stokes (N-S) equations over moving overset grids. Various speeds of downward flight were considered (the nondimensional speed of downward flight is 0.1, 0.2 and 0.5). The main results were as the following: the force coefficients varied slightly when the insect hovering and having small speed of downward flight, the change of the force coefficients and moment of force coefficient generally was less than 2%; when the insect having large speed of downward flight, the effect of wake was relatively large, which resulted in the oscillation of the average force coefficients and moment of force coefficient, but it had only minor effects on the insect stable flight. Results of the paper would have important academic value and engineering significance in study of the insect flight and design of micro air vehicle (MAV).
Key words: fluid mechanics; insect; downward flight; aerodynamic force; flight stability
发表期数: 2014年2月第3期
引用格式: 梁彬,孙茂. 昆虫垂直下飞时的气动特性[J]. 中国科技论文在线精品论文,2014,7(3):277-284.
 
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