摆动水翼绕流的数值研究  

NUMERICAL STUDIES ON FLOWS AROUND A FLEXIBLLY WIGGLING HYDROFIOL

作　　者：何国毅[1] 张星[2] 张曙光[3] 

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100191 [2]中国科学院力学研究所LNM室,北京100190 [3]北京航空航天大学交通科学与工程学院,北京100191

出　　处：《力学学报》2010年第1期15-22,共8页Chinese Journal of Theoretical and Applied Mechanics

基　　金：国家自然科学基金(10732090;10872201);973项目非线性科学(2007CB814800)资助项目~~

摘　　要：鱼类经常采用垂直流向的摆动进行游动,这种摆动可以用行进波来表示.应用浸入边界方法模拟了低雷诺数条件下水翼NACA65-010在水中摆动时的流场,并研究了雷诺数对水生动物推进效率的影响.结果表明:随着雷诺数的增大,推力系数和推进效率增大,而功率系数减小;在Re<20时,推力系数,推进效率和功率系数的变化尤为剧烈.随雷诺数增加,由于水翼摆动诱导的流场变化也更加复杂,水翼后缘处的涡量场强度逐渐增强.摆动诱导反卡门涡街产生推力.Fishes often use a wiggling motion to generate propulsion for swimming.The wiggling motion can be modeled by a progressive wave.In the present study,an immersed boundary method is used to simulate the flows around the wiggling hydrofoil NACA 65-010 at low Reynolds numbers,and the effects of Reynolds numbers on the propulsion generation are investigated.It is observed that,as the Reynolds number ranges from 1 to 200,both the thrust coefficient and the propulsion efficiency increase with the increase of the Reynolds number,while the power efficiency decreases.Especially in the ranges of the Reynolds number smaller than 20, the lift,thrust and power coefficients exhibit a large change.With the increase of the Reynolds number,the flow patterns around the wiggling foils become more complex：the vorticity becomes more intensive near the trailing edge and the wiggling foil produces reversed von Karman vortex streets to generate propulsion.

关 键 词：水翼 摆动 推进 浸入边界方法 反卡门涡街 

分 类 号：O257[理学—数学] O351