叶片泵内气液两相流的三维流动数值模型

基于双流体模型建立针对叶片泵内气液两相三维湍流流动的数学模型和数值计算方法.相间作用力考虑了阻力和附加质量力,湍流模型考虑了因相含量脉动引起的附加源项,在SIMPLEC算法基础上提出了一种气液两相流的压力修正算法.运用所建模型计算了叶片式气液混输泵在进口含气率分别为5%,15%,25%的系列工况下叶轮的内部两相流场,并作了扬程特性预测.与实验结果的对比表明,所提出的流动模型是可靠的,并具有较宽的进口含气率适用范围.

A Numerical Model for 3-D Gas-Liquid Two-Phase Flow in Vane Pumps

A two-phase 3-D turbulence model is presented based on the two-fluid model for the simulation of gas-liquid bubbly flow in vane pumps. The model accounts for the interracial momentum transfer terms arising from the effects of drag and virtual mass. The turbulence is modeled by an extension of the standard k-e turbulence model which accounts for fluctuations of gas volume fractions. The discrete equations are solved using a developed two-phase SIMPLEC algorithm. The method is applied to the turbulent gas-liquid two-phase flow in a multiphase rotodynamic pump impeller in a series of cases, and the pump performance is predicted. Comparision with the experimental results showed that the numerical model is reliable in a wide range of inlet gas volume fractions.