长鳍波动推进水动力效率计算分析

Numerical calculation of hydrodynamic efficiency of long undulating fin

"尼罗河魔鬼"鱼在保持身体不变形的情况下依靠其长背鳍波动推进实现直线巡游,通过改变波动传播方向,即可实现前进或后退。鉴于其独特的优点,长鳍波动推进成为仿生推进研究重要的推进模式之一。目前对这种仿生推进模式的水动力学研究还相对较少,已有的一些研究工作中相当一部分还不涉及推进效率。该文通过数值计算,对柔性长鳍波动推进的水动力和推进效率进行研究。该研究对于长鳍沿轴向各部分鳍面的输入功率的要求及其对总推力的贡献分析具有参考价值。

The amiiform fish Gymnarchusniloticus is able to swim as easily forward as backward just by switching the spread direction of its long dorsal fin while keeping its body almost straight.Its extraordinary ability on swimming manners is of great inspiration to us on propulsor design.However,there are relativelyfew hydrodynamic studies on this bionic propulsion model at present,and quite a few of the existing research work does not involve propulsion efficiency.In this paper,the hydrodynamic force and propulsion efficiency of the undulating fin is studied based on series of numerical simulation.This study has reference value for the input power requirements along the a xia lundulating fins and their contribution to the total thrust.