水轮机混凝土蜗壳液固两相流的CFD分析

CFD Analysis of Liquid-solid Two-phase Flow in Concrete Volute of Water Turbine

根据标准k-epsilon湍流模型,采用欧拉法对水轮机混凝土蜗壳内水沙两相流进行仿真分析。仿真条件是两因素三水平。第一个因素是含沙量,设为0.5%、1%和1.5%3个水平;第二个因素是颗粒直径,设为0.05、0.1和0.5 mm 3个水平。结果表明:随着含沙量的增加,蜗壳内的压力升高。在含沙量相同的条件下,粒径的增加会引起蜗壳内沙粒体积分数的增大。在粒径相同的条件下,随着蜗壳进口含沙量的增加,蜗壳内沙粒的体积分数也随之增加。

Based on the standard k-epsilon liquid turbulence model,Eulerian method is used to simulate the two-phase flow of water and sand in concrete volute of turbine.The simulation conditions contain two factors with three levels each.The first factor is the sand content,which is set at 0.5%,1%and 1.5%.The second factor is particle diameter,which is set at 0.05mm,0.1mm and 0.5mm.The results show that the pressure increases with the increase in sand content.Under the condition of the same sand content,the increase in diameter will lead to the increase in the volume fraction of sand in the volute.Under the condition of the same diameter,the volume fraction of the sand increases in the volute with the increase in the sand content at the inlet of the volute.