离心泵内部两相流模拟及其叶轮的流固耦合分析

应用N-S方法和标准k-ε湍流模型,采用SIMPLE法,对离心泵内部三维固液两相流进行了模拟计算。得到不同固相(颗粒)浓度下的离心泵内部压力分布和内部颗粒浓度分布情况,并且基于流固耦合原理对离心泵叶轮进行结构分析,采用多物理场协同仿真平台ANASYS Workbench,通过单向流固耦合技术实现离心泵叶轮结构的仿真计算,获得了离心泵叶轮在同一工况、不同固相浓度下的等效应力及变形情况。计算结果表明,蜗壳中压力和固相体积浓度分布规律都是从进口处随蜗壳半径增大而增大,并且在隔舌处出现浓度分布不均匀的现象。各种计算条件下,叶轮的等效应力和总变形情况变化趋势基本上相同,叶轮的应力分布都不均并且存在局部应力集中,固相体积浓度越大离心泵叶片的变形也越严重。

Numerical simulation of two 2phase flow in centrifugal pump and analysis of fluid2structure interaction of the impeller

Based on the N2S equation and the traditional k 2E turbulent model, the SIM PLE method was applied to simulate the three 2dimensional solid 2liquid two 2phase flow field in the centrifugal pump. T he distributions of internal pressure and particle concentration were obtained under different concentrations of the solid phase in the centrifugal pump. The structure of centrifu2 gal impeller was analyzed based on the fluid2structure interaction theorem. T he multi 2physical co 2simulation platform ANASYS Workbench was used, and the numerical simulation of centrifugal impeller structure was conducted base on the one 2way fluid 2 structure interaction technology. The equivalent stress and deformation under the different concentrations of the solid phase and same working conditions were determined. The results showed that the volute pressure and solid volume concentration increase with the increasing of spiral radius from the entrance, and the uneven distribution of regional concentration appears at the tongue. Under all the calculation conditions, the variation trends of equivalent stress and total deformation of the impeller are ba 2 sically the same. The stress distribution of the impeller is uneven and local stress concentration occurs. The greater the solids volume concentration, the higher the deformation of centrifugal pump impeller.