双吸式离心泵叶轮泥沙磨损数值模拟  

Numerical simulation of sediment erosion in double-suctions centrifugal pump

作　　者：钱忠东[1] 王焱[1] 郜元勇[1] 

机构地区：[1]武汉大学水资源与水电工程国家重点实验室,武汉430072

出　　处：《水力发电学报》2012年第3期223-229,共7页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金资助项目(51079106);中央高校基本科研业务费专项资金资助(2103002;5082019)

摘　　要：采用欧拉—拉格朗日多相流模型,对双吸式离心泵内的水流和泥沙颗粒运动进行了模拟,并采用离散相冲击磨损模型对不同泥沙浓度和粒径条件下的叶轮磨损进行了分析,分析结果表明:离散相冲击磨损模型可以准确预测叶轮的磨损位置和磨损强度;随着泥沙浓度的增加,叶片的磨损强度显著提高;叶片吸力面的磨损强度明显高于压力面,压力面的磨损位置集中在叶片的进口和出口处,吸力面的磨损位置则随着泥沙浓度的增加而改变;泥沙粒径是影响磨损强度的重要因素,随着粒径的减小,磨损强度显著降低。Water flow and sediment movement in a double-suctions centrifugal pump were simulated with an Euler-Lagrange multiphase flow model,and erosion of the runner by different sediments was predicted with a particle erosion model.The results show that the erosion model can accurately predict the erosion rate and erosion position on the runner.The erosion rate increases significantly with sediment concentration inereasing and decreases with the decreasing of sediment diameter.For different sediment concentrations,the erosion rate on the blade′s suction side is always greater than that on its pressure side.On the pressure side the erosion near the passage inlet and outlet is more severe,while on the suction side the erosion location changes with different sediment concentration.

关 键 词：双吸式离心泵 磨损 离散相模型 数值模拟 

分 类 号：TH311[机械工程—机械制造及自动化] TV136.2[水利工程—水力学及河流动力学]