仿鱼尾潜器推进系统的水动力分析

Hydrodynamic analysis of submersible propulsion system imitating tuna-tail

以开发适用于小型潜器的仿生操纵与推进系统为研究背景 ,对金枪鱼的月牙形尾鳍进行水动力分析。文中将金枪鱼的尾鳍处理为在做横移和摇摆的耦合运动的同时 ,以某一匀速向前运动的月牙形刚性尾翼。计算中应用了双曲面元和压力库塔条件 ,利用面元法计算分析该三维尾翼的非定常水动力性能。探讨了前进速度、横荡和摇首的幅度。

In this paper, the unsteady hydrodynamic characteristics of oscillating tuna tail are analyzed numerically by surface panel method. The tuna tail is considered as a three dimensional lunate fin oscillating with the mode combined swaying and yawing in uniform flow. The low order potential based surface panel method using the hyperboloidal quadrilateral panels is applied to solve numerically the unsteady flow. On the trailing edge of the fin the pressure Kutta condition is satisfied. The thrust coefficient, the lateral force coefficient and the propulsion efficiency can be obtained. The effects of the oscillating amplitude and the phase difference between swaying and yawing are investigated. The analytical result indicates that the present numerical method is effective for researching into the hydrodynamic characteristics of oscillating tuna tail.