基于双向流固耦合仿真的新月形尾鳍水动力学特性研究

Research on hydrodynamic characteristics of crescent-shaped tail fins based on bidirectional fluid-structure coupling simulation

以新月形仿生机器鱼尾鳍为研究对象,基于双向流固耦合仿真技术,研究了新月形仿生机器鱼尾鳍的结构参数和运动参数对其水动力学参数的影响关系。结果表明:增大尾鳍摆角幅度和摆动频率有利于提高推进力,同时也带来了游动的不稳定性;相比于等厚度柔性尾鳍,变厚度柔性尾鳍具有更好的推进性能,符合真实鱼类尾鳍结构特征;柔性大面积新月形尾鳍的推进性能最优。

This paper takes the tail fin of a crescent-shaped bionic robotic fish as the research object,and studies the influences of the structure and motion parameters of the tail fin of a crescent shaped bionic robot fish on its hydrodynamic parameters based on the bidirectional fluid-structure coupling simulation technology.The results show that the increase of the swing angle amplitude and swing frequency of the tail fin is conducive to improving the propulsion force,but also brings the instability of swimming;compared with the flexible tail fin of equal thickness,the flexible tail fin of variable thickness has better propulsive performance,which accords with the structural characteristics of real fish tail fin.The crescent-shaped tail fin with flexible large area has the best propulsion performance.