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RESEARCH ON FUNCTION OF 8-SHAPED VORTEX IN OSCILLATORY PROPULSION

Wu Jing and Gao Ge (Beijing University of Aeronautics and Astronautics)  
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.
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