基于CFD的喷水推进泵导叶三维反设计研究

导叶整流效果不佳是某喷水推进船未达到设计航速的一个重要原因.介绍基于三维理论的喷水推进泵导叶设计方法,叶片形状通过给定轴面轮廓和环量分布规律后经迭代计算得出.基于计算流体力学工具建立描述喷水推进泵内流场的数值模型,采用六面体网格划分计算域,选用SST湍流模型封闭雷诺时均方程.通过周向动能与轴向动能的比值来评估导叶的整流效果,分析喷口直径和导叶轴面形状对喷水推进泵性能的影响规律.结果表明:三维反设计方法和CFD可在喷水推进泵导叶设计中发挥重要作用,导叶经优化设计后可使喷水推进泵推力提高约5%.

3D inverse design of waterjet stator based on CFD

The bad commutating performance of a waterjet stator is one important reason that the waterjet ship failed to achieve the expected speed. The 3D inverse design method of waterjet stator is introduced, the blade shape is designed for a specified distribution of circulation and meridional geometry. A numerical model based on CFD describing interior flow of waterjet is built up, which is meshed with hexahedral grids and computed by solving RANS equations and SST turbulent model. Ratio of the circumferential energy to the axial energy at nozzle outlet is used to check commutating performance of the stator. The results show that 3D inverse design method and CFD tool can play a important role in waterjet stator design and optimization. The optimized stator largely increases the waterjet thrust about 5%.