在鱼鳍的推进性能的研究中,鱼鳍波状运动产生推进力使鱼类具有很高的机动性,可以在复杂的水下环境中穿梭自如,可以实现精确的位置和姿态控制,且运动更具连续性和平稳性.针对上述问题,建立了鱼鳍摆动和波动的运动学方程,并借助于流体动力学软件比较分析了鱼鳍在没有前端扰动和加入前端扰动两种情况下的波动推进力和升力产生的机理,分析前后缘涡产生、脱泻、相互作用的过程,揭示前端周期性扰动对鱼鳍波动推进性能的影响及其规律.仿真结果显示:波动鳍对前端周期性扰动形成的尾迹反卡门涡街进行重新调制,可以从中获取能量用于提高自身波动推进性能.研究为研制高性能的多鱼鳍协调控制推进的仿鱼鳍推进器提供理论依据.%Fishes that rely on their fin undulatory motion to generate thrust usually have high maneuverability. They can swim freely in the complex underwater environment and realize the accurate position and posture control with more continuous and smooth motion. We established the kinematical equation of both oscillating motion and undulating motion of the fin. With the help of fluid dynamic analysis software, a comparative analysis of the thrust and lift force generating of the fin with or without anterior periodic disturbance was conducted. We then focused on the generation, shedding and interaction process of leading edge vortex and the trailing edge vortex and revealed the influence of the anterior periodic disturbance on the fin undulatory propulsion performance. From the simulation results we concluded that: the reversed Kaman vortex street in the wake produced by the anterior periodic disturbance is re -adjusted by the fin which provides extra energy for fin propulsion. The research provides some theoretical basis for the development of high performance and multiple fin coordination controlled underwater propellers.
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