基于Euler-Lagrange方法,采用CFX软件对抽送黄河水的离心泵内的流动进行了数值计算,根据计算结果可知在固体颗粒直径相同的情况下,随着固相体积分数的增加,离心泵的扬程和水力效率都随着固相体积分数的增加而下降,叶道间出现明显的涡流,从而使得泵性能变差.其次采用Particle模型和颗粒单向耦合模型,对离心泵抽送不同直径的泥沙颗粒的混合液进行了数值模拟,分析探讨了泥沙颗粒的运动规律和泵内部的磨损情况.结果表明:颗粒的分布与流道的布置方式、颗粒的大小均有重要关系,泵内部磨损与固体颗粒的相对速度、浓度、颗粒大小也有直接关系,叶片出水边吸力面靠近后盖板处是磨损最为严重的区域.%Firstly,the numerical simulation of internal flow of the centrifugal pump pumping Yellow River water is conducted by CFX on account of the Euler-Lagrange method in this paper,and it is found that the head and efficiency values of the pump present a continuous downward trend with increase of the solid-phase volume fraction with the same particle diameter,there appearing the obvious vortex in the blade channels which worsens the pump performance.Secondly,the particle model and one-way coupling model are adopted to conduct calculation of centrifugal pump as it pumps slurry containing solid particles with the same and different diameters respectively,with the motion law of solid particles and abrasion pattern inside the pump researched.The results show that distribution of particles are related closely to layout of the flow channel and size of particles,and that pump abrasion is affected by the relative velocity,concentration as well as size of the solid particles,with location near the rear cover in suction surface of the outlet edge of the blade being the most seriously abraded area.
展开▼
