离心泵叶轮内的网格生成与计算流体力学分析

Grid generation in the centrifugal pump impeller and computational fluid dynamics analysis

根据离心泵叶轮通道的几何和流场特点,探讨了离心泵叶轮通道结构化多块网格划分中的一些处理方法。同时应用标准k-ε紊流模型加壁面函数法对离心水泵叶轮内部的三维紊流流动进行了雷诺平均N-S方程的数值计算与分析。分析了离心泵叶轮叶型对流速分布、压力分布和泵性能的影响,研究了离心泵叶轮通道内流动规律,并以计算流体力学(CFD)分析结果为依据,对离心泵叶轮进行了叶型优化设计。结果表明进行离心泵叶轮内三维紊流数值计算可为离心泵叶轮叶型优化提供详细的数据,应用CFD分析技术可提高离心泵叶轮的设计水平。

Structured grids are applied widely due to its lower memory consuming and its convenient grid numbering. It is unfavorable to describe the complicated fluid channel in the centrifugal pump impeller by mono-block grid. In this paper, based on the feature of geometry and fluid field, multi-block grid technique was used to generate the complicated fluid channel mesh in the centrifugal pump impeller, and the standard k-ε turbulence model and wall function were adopted to solve 3D turbulent flow field in the impeller of a centrifugal pump. The influences of the blade profile on speed distributions, press distributions and pump performance were analyzed. The flow regulation pattern in the impeller of a centrifugal pump was also investigated. A redesign and optimizing method of the impeller blade profile based on numerical analysis of 3D turbulent flow was put forward. The results show that accurate and abundant flow field data were provided for the impeller modification. The proposed method is a very outstanding tool to improve the level of the impeller modification.