船舶反弯扭螺旋桨水力特性的数值模拟与分析

运用计算流体力学方法(CFD)对船舶反弯扭螺旋桨的水力特性进行数值模拟计算,获得了螺旋桨的推力系数、扭矩系数及敞水效率等水力特性参数,与试验结果进行了比较,两者吻合良好.模拟计算提供了详细的三维流场分布,可对反弯扭桨叶的工作特性和叶梢涡、尾涡及气蚀的分布状态进行深入的分析.在叶面邻近区域采用层叠式的半结构网格以适应边界层的计算要求,在边界层外的流动区域采用非结构网格,取得了较高的计算精度.

Numerical analysis for hydraulic characteristics of marine propeller under reverse bent and twist

The computational fluid dynamics(CFD) method is used to simulate numerically the hydraulic characteristics of a marine propeller under reverse bent and twist.The hydraulic parameters such as thrust coefficient,torque coefficient and open-water efficiency etc,are acquired and compared with the experimental results.Both agree with each other fairly well.The detailed distribution of the 3-D flow field obtained from the simulation can be used to analyze the operation performances of the propeller under reverse bent and twist.The conditions of the tip and trailing vortices.The layer mesh,which is referred to as "semistructured"mesh,is used in the vicinity of the propeller surfaces to meet the requirement of boundary layer calculation,while the unstructured mesh is adopted in the flow domain outside the boundary layer.This mesh arrangement is beneficial to raise the calculation accuracy.