基于沉浸边界法的二维拍动翼数值模拟  

Numerical simulation of 2-D flapping foil by using immersed-boundary method

作　　者：潘定一[1] 邓见[1] 邵雪明[1] 

机构地区：[1]浙江大学力学系,流体传动及控制国家重点实验室,浙江杭州310027

出　　处：《空气动力学学报》2008年第4期419-424,共6页Acta Aerodynamica Sinica

基　　金：水动力学国防重点实验室基金;高等学校博士点专项科研基金(20070335066)

摘　　要：运用沉浸边界法对二维拍动翼流场进行了数值模拟,系统地分析了最大俯仰角、拍动频率和升沉俯仰运动的相位差等参数对拍动翼流场的影响。结果显示:当达到一定条件时,尾流出现反卡门涡街,使机翼得到正的推力而产生逆流前行的趋势。在本文的研究范围内发现,拍动翼的平均推力系数随最大俯仰角的增大先增大后减小,随着频率的增大而增大,同时,拍动翼的推进效率随最大俯仰角的增大而增大,随拍动频率的增大而减小,且当升沉俯仰运动的相位差在90°～100°之间时,存在着最大推进效率。本文所得结果为进一步研究鸟类飞行和鱼游等仿生力学提供了理论基础。The flow field of the foil with both the heave and pitch motion was simulated by using immersed-boundary method. The affection of the maximum pitch angle, flapping frequency and the phase difference of pitch and heave motion were analyzed systemically. It is shown that the reversed Kaman vortex street was generated,and then the foil get the positive thrust. The results also show that, with the increasing of maximum pitch angle,the foil＇s thrust coefficients increased first, then decreased, and increased with the increasing of frequency, the propulsive efficiencies increase with the increasing of maximum pitch angle whereas decrease with the increasing flapping frequency. The obtained results supply the foundational theoretical basis for the studies of bird flight and fish-swimming.

关 键 词：沉浸边界法 仿生力学 反卡门涡街 拍动翼 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]