气液两相介质时液力透平径向力分析

基于N-S方程和标准κ-ε湍流模型，采用SIMPLE算法，选择Mixture多相流模型，以比转速为41的离心泵反转作透平为研究对象，通过CFD软件对透平在气体体积分数为0%、5%、10%、15%的两相流介质中进行数值模拟，得到透平在不同气体体积分数下的外特性、静压力以及所受径向力的大小和方向，分析径向力对液力透平的影响。结果表明:透平的压头随着流量增大而逐渐增大；两相流时透平的径向力随着流量的增加而逐渐增大，随着气体体积分数的增大而逐渐变小，径向力的方向在沿液流距隔舌80°~130°角之间。  

Numerical Simulation of Hydraulic Turbines Working in the Medium of Gas Liquid two-phase and Analysis of the Force Performance

The numerical simulation is based on N - S equations and the standard equations κ -ε turbulent model. By usingSIMPLE algorithm and Mixture model, a pump inversion whose specific speed is 41 is useed as the object of the study. By using CFD method to conduct numerical simulation of PAT modes in air content of 0% ,5%, 10% and 15%. The external characteristics, static pressure and the radial force of the size and direction of PAT are obtained in different volume fractions of gas. The influence of radial force on PAT is attained and the result shows that numerical simulation has certain guiding significance for the design of PAT. The re- suits indicate that the pressure head of PAT increases with the flow increased. The radial force of PAT increases rapidly as the flow increases and decreases rapidly as the air content increases. The direction of the radial force is concentrated in the Angle between 80° to 130°.