摆动水翼的推力与流场结构数值研究

在一定的Reynolds数范围内，水生动物和微型仿生机械通常采用摆动的方式获得推力，这种摆动可以用行进波来表示，行进波的波长则描述了摆动生物的柔性．该文用浸入边界方法模拟了低Reynolds数情况下，水翼NACA-65-010在水中摆动时的流场．结果表明，水翼摆动产生推力的大小与行进波波长密切相关，随着波长的增大，推力系数减小，推进效率则在一定的波长值达到最大；推力的产生与两种流场结构有关:即反Krmn涡街和涡对，摆动水翼后缘尾迹中形成反Krmn涡街时产生的推力要大于尾迹中形成涡对产生时的推力．

Thrust Generation and Wake Structure of a Wiggling Hydrofoil

A wiggling motion is often used by marine animals and micro-machines to generate thrust.The wiggling motion can be modeled by a progressive wave where its wavelength describes the flexibility of wiggling animals.In the present study,an immersed boundary method was used to simulate the flows around the wiggling hydrofoil NACA-65-010 at low Reynolds numbers.It is found from the numerical simulations that the thrust generation is largely determined by the wavelength: The thrust coefficients decrease with incre...