仿生鳍形状与运动模式对推进性能的影响

摘要

为探究仿生鳍形状与其运动模式间的内在关系,采用非耦合隐式求解器求解非定常不可压缩NAVIER-STOKES方程和连续性方程.分析相同运动学参数和面积时,菱形、正方形、长方形和三角形4种形状仿生鳍在波动和摆动2种运动模式下产生的推进力大小;从压力分布、涡街结构等方面给出差异存在的原因,并找出鳍面形状和推进模式之间的内在联系.结果显示:相同运动学参数和鳍面形状时,不同推进模式产生的推进力存在较大差异;同样,相同运动学参数和推进模式时,鳍面形状对推进力也有较大影响.该研究为仿鱼推进器选择合适的鳍面形状和匹配的推进模式以实现较优推进性能提供参考.%In order to illustrate the inner relationship between shape and motion patterns of the biomimetic fin, the unsteady incompressible N-S equation and continuity equation were solved by an uncoupled implicit solver.The forces generated from four kinds of fin shapes ( diamond, square, rectangle and triangle ) in undulating and oscillating propulsion patterns under the same kinematic parameters and area were analyzed. From aspects of the pressure distribution and the structure of vortex street, the reasons of the differences were presented, the inner relationship between the fin shape and propulsion mode was also illustrated.The results show that the different propulsion modes have different propulsion forces when the kinematics parameters and fin shapes are the same.Similarly, when the same kinematic parameters and propulsion modes are used, the fin shapes have a great influence on propulsion forces.The study provides a reference for the selection of suitable fin shape and matching propulsion mode for bionic fish thrusters to achieve better propulsion performance.