轮-叶复合式推进装置运动仿真分析

摘要

We simulated the move status of a basilisk lizard running on the water to develop a wheel - blade compound propulsion unit. In order to get the thrust, lift and flow changes of the propulsion unit, this paper used the CFD software to calculate the performance of a wheel - blade compound propulsion unit, applied the VOF Model and Dynamic Mesh Update Method to simulate the movement of the bionic propulsion unit at different solutions. The simulation results show that this unit can provide an efficient propulsive force and lift force, and achieve maximum at zero immersion depth. Changing the conditions and structure have great influences on the performance of the propulsion uint. As the symmetric structure of the propulsion unit, thrust and lift cyclical shocks is in line with the movement of the impeller.%研究水陆两用车辆的推进装置推动力的有效性设计,可通过模仿双嵴冠蜥在水上行走时腿部的运动姿态,设计了一种新型轮-叶复合式推进装置.为获得推进装置在一个运动周期内的推进力、升力和流场变化情况,采用VOF模型和动网格方法对在不同浸水深度、夹角条件下的水动力性能进行动力学仿真.结果表明,装置能够提供有效的推进力和升力,在零浸水深度处推进力和升力均可得最大值；改变叶片夹角时,推进力和升力有较大变化,且在一个周期内,推进装置产生的推进力和升力呈现交替性波动.