“8”字涡在摆动中作用之探讨及实验研究

RESEARCH ON FUNCTION OF 8-SHAPED VORTEX IN OSCILLATORY PROPULSION

通过对鱼类摆动推进的观测研究 ,提出了摆动推进的波涡原理 ,理论分析认为“8”字涡的存在与相互作用是提供推力的原因。通过对刚性摆动翼的有关实验 ,得到启发性的有力证据。并发现“8”字涡具有储能特性。这一新型原理对分析鱼类游泳及设计高效推进器具有重大意义。

A wave-vortex principle of oscillating propulsion is presented,which is based upon the observation and experimental study of fish′s oscillating propulsion.The theoretical analysis shows,that the occurence and interaction of 8-shaped vortex is the reason for creation of thrust.The experiments accomplished with oscillating stiff blades give a strong heuristic evidence.It is that the discovered 8-shaped vortex possesses behaviour of energy storage.This new principle is of great significance for analysing fish′s swimming and designing high efficiency propeller.