仿生机器鱼胸尾鳍协同推进的水动力学分析

利用CFD技术对仿箱鲀科胸尾鳍协同推进机器鱼的水动力学特性进行分析,将整个机器鱼放入流场,对其胸鳍推进模式、尾鳍推进模式和胸尾鳍协同推进模式的水动力学特性进行对比,得出不同模式下机器鱼水动力学的变化规律。分析得出,在压力变化云图中,胸尾鳍协同推进产生的压力变化最为复杂;在速度涡量变化图中,胸尾鳍协同推进产生最为复杂的涡量变化,胸鳍运动产生的涡会逐渐脱落向后移动,与尾鳍产生的涡互相作用,增加尾鳍的推力,从而证明胸尾鳍协同推进模式是一种高效的推进机制。

Hydrodynamics analysis of the cooperative propulsion of the pectoral tail fin of a bionic robot fish

Hydrodynamic characteristics of fish with co-propulsion of pectoral and caudal fins in Puffer fish (Ostracidae) were analyzed by CFD ( Computation Fluid Dynamics) technique, compared with the previous analysis of only fins or fish bodies,this paper puts the whole robot fish into the flow field for analysis. The hydrodynamic characteristics of the pectoral fin, the caudal fin and pectoral tail propulsion models were compared, and the variation law of the hydrodynamics of the robot fish in different modes was obtained. The analysis shows that the pressure variation caused by the cooperative propulsive of the pectoral tail is the most complicated in the pressure change cloud picture. in the velocity vorticity change diagram, the most complex vortex changes are generated by the concerted advancement o-f the pectoral tail fin, and the vortices generated by the pectoral fin move back and gradually fall off.After the movement, the interaction of the vortex and tail fin can increase the thrust of the caudal fin, which proves that the copropulsion mode of pectoral tail is an efficient propulsion mechanism.