不同工况下仿生叶轮水上推进性能数值分析

Numerical Simulation of Water-Propulsion Performance of Bionic Impeller under Different Working Conditions

研究采用蛇怪蜥蜴踏水机理设计的轮-叶复合式仿生推进装置,针对实现推进性能最大化的仿生叶轮装置设计的难点,从减少叶片能量损失的角度设计了一种压水防溅型仿生叶轮结构,如何有效获取新型叶轮结构的水上推进性能,应用计算流体力学数值方法,通过构建不可压缩非稳态的N-S主控制方程,采用欧拉网格有限体积法的离散化处理方式,综合应用VOF模型和动网格技术,实现对新型仿生叶轮水上推进性能的数值模拟,着重讨论了不同转速ω和负载P下的仿生叶轮水平速度v1和水平位移s1的变化规律,研究仿生叶轮运动中压力场、速度场和气液相的分布特点,获得了转速ω和负载P对仿生叶轮水上推进性能的影响规律。仿真分析结果表明转速ω和负载P均存在一合理区间范围,使得新型仿生叶轮推进性能最优,仿真结果可为实现仿生叶轮模型水上推进性能最优提供了理论基础。

A wheel -blade compound propulsive device is designed,which is based on the mechanism of a basi- lisk lizard treading water. In order to design the device to gain the most excellent propulsive performance, an uncom- pressed N - S main control equation is established, the diseretization of the finite volume method is used based on the Euler grid, the VOF model and the dynamic mesh technique are comprehensively applied, and the numerical simula- tion of the propulsion performance of the bionic impeller on water is obtained. The change rule of the horizontal veloc- ity v1 and the horizontal displacement s1 is analyzed under different rotate speeds to and different loads P,and the nu- merical simulation of water - propulsion performance of bionic impeller is realized. The simulation result indicates that both the rotate speed to and load P have reasonable ranges to make the most excellent propulsive performance, and it will provide the theoretical basis for the propulsion performance optimization of the bionic impeller on water un- der different working conditions.