侧风对拍动翅气动力的影响  

Effects of lateral wind on aerodynamic force of a flapping wing

作　　者：牟晓蕾[1] 许娜[2] 

机构地区：[1]烟台大学土木工程学院,烟台264005 [2]烟台大学机电汽车工程学院,烟台264005

出　　处：《北京航空航天大学学报》2017年第11期2310-2315,共6页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家自然科学基金(11502228);山东省自然科学基金(ZR2016AL08;BS2014SW016)~~

摘　　要：昆虫在自然界中飞行时多会受到侧风的干扰,因此了解侧风作用下昆虫拍动翅上气动力的变化对昆虫飞行机理的研究工作具有重要意义。应用计算流体力学(CFD)方法模拟了存在侧风时拍动翅上绕流,并与正常悬停情况进行对比,从侧风的方向和强度2个方面考察了其对拍动翅气动特性的影响。结果表明:侧风对拍动翅气动特性的改变包含2个流动机制的贡献,即相对速度效应和前缘涡轴向速度效应,且从翅尖吹向翅根的侧风与从翅根吹向翅尖的侧风对气动力的影响有着显著的不同;而不同强度的同向侧风下,气动力的改变类似,仅存在数值上的差异。Insects are often disturbed by lateral wind when flying in nature. Thus understanding the variation of aerodynamic force of the flapping wing under the lateral wind is significant to the research on flying mechanism of insects. The fluid fields around the flapping wing under the lateral winds were simulated using the method of computational fluid dynamic（ CFD）,which were then compared with the hovering situation（ with no lateral wind）,and the effects of the dynamic characteristics of flapping wing was investigated from two aspects of the strength and direction of the lateral wind. The results indicate that the lateral wind has two contributions to the aerodynamics of the flapping wing： one is＂changing-relative-velocity＂effect,and the other is ＂changing-LEV-axial-velocity＂effect. Lateral winds in different directions（ from wing-tip to wing-root or from wing-root to wing-tip） have obviously different effect on the aerodynamics; however,under lateral winds with different intensities but the same direction,the variations of aerodynamic force are similar,and there are only numerical differences.

关 键 词：侧风 昆虫 气动力 悬停 数值模拟 

分 类 号：V221.3[航空宇航科学与技术—飞行器设计] TB553[理学—物理]