摘要
This paper investigates the swimming performance of fish undulatory motion which is the basic form in locomotion of aquatical animal from a hydrodynamics point of view.In particular,the propulsive characteristics is discussed.The three-dimensional potential flow over a model rectangular flexible plate performing the motion which consists of a progressive wave of a given wave length and phase velocity along the chord is treated.Vortex ring method is used to calculate the thrust,the power required and the hydrodynamic propulsive efficiency,etc.The dependence of these energetics on certain physical parameters,such as the aspect ratio,the reduced frequency and the wave number,is discussed.It is found that as the wave tength gets close to the body length,propulsive performance is no longer sensitive to the aspect ratio.Some qualitative explanation of the fish swimming phenomena is also given.
This paper investigates the swimming performance of fish undulatory motion which is the basic form in locomotion of aquatical animal from a hydrodynamics point of view.In particular,the propulsive characteristics is discussed.The three-dimensional potential flow over a model rectangular flexible plate performing the motion which consists of a progressive wave of a given wave length and phase velocity along the chord is treated.Vortex ring method is used to calculate the thrust,the power required and the hydrodynamic propulsive efficiency,etc.The dependence of these energetics on certain physical parameters,such as the aspect ratio,the reduced frequency and the wave number,is discussed.It is found that as the wave tength gets close to the body length,propulsive performance is no longer sensitive to the aspect ratio.Some qualitative explanation of the fish swimming phenomena is also given.
