基于流固耦合方法的斜流泵叶轮强度分析

摘要

叶轮作为斜流泵的核心关键部件,其安全性和稳定性对泵机组的稳定运行和使用效率有较大影响.本文基于CFX软件,选用标准k-ε模型,采用SIMPLEC算法对斜流泵内部流动进行三维数值模拟.将流场的计算结果作为已知条件导入ANSYS Workbench界面,采用单向流固耦合方法对叶轮耦合系统进行仿真计算.研究结果表明,数值模拟采用的网格类型、湍流模型能够较为准确地计算斜流泵的内部流动特性.叶轮叶片最大应力出现在叶片的中部区域,最大等效应力值为53.24MPa,远小于材料的疲劳极限；最大的变形发生在叶片外缘处,整体变形在许用范围之内；流体作用力是影响叶轮强度的主要因素.%The security and stability of impeller which is the core of the key components of the mixed flow pump become the important factors with an impact on the stable operation and efficient of the pump unit. The three-dimensional flow field in mixed-flow pump were numerically simulated based on CFX software, a standard k-e model, SIMPLEC algorithm. The calculation results of the flow field as the known conditions import ANSYS Workbench interface, the impeller coupled system were simulated by the one-way fluid-structure interaction method. The results show that the type of numerical simulation grid, turbulence model can accurately predict the internal flow characteristics of the mixed-flow pump. The maximum stress of the impeller blades occurs at the middle region of the blades, and the maximum stress value is 53. 24MPa, far less than the fatigue limit of the material; maximum deformation occurs at the blade outer edge, within the allowable range; the fluid forces are the major factors influencing the impeller strength.