摘要
泥沙磨损是沿黄泵站水泵运行中不可避免的一个重要问题。通过对沿黄泵站广泛使用的双吸式离心泵进行数值模拟研究,分析叶片压力面出口的磨损机理。采用欧拉-拉格朗日多相流模型对离心泵内的水沙两相流进行模拟,分析叶轮流道内固体颗粒的特征及分布情况,应用颗粒磨损模型,预测叶片出口面的磨损破坏程度;通过对叶轮流道内固体颗粒轨迹的追踪与流道内涡旋的分析,分析流道涡对泥沙颗粒轨迹的影响,进而说明叶片出口面磨损的原因。研究结果表明:泥沙颗粒的分布与相对速度的大小是影响叶片压力面出口段磨损的重要因素;流道涡的产生会显著改变附近颗粒的轨迹,导致颗粒集中在叶片出口表面附近,加剧叶轮压力面出口的磨损。
In order to study the erosion of the pressure surface of the double-suction centrifugal pump,the Euler-Lagrange multiphase flow model is used to simulate the water and sand movement in the flow path of the centrifugal pump,and the discrete phase model is used to simulate the wear of the particles on the flow parts.In the case,CFD is used to simulate the full flow channel of the 800S-76 pump.By analyzing the characteristics and distribution of solid particles in the impeller flow passage,we know that the erosion at the end of the pressure surface of the blade is due to the high solid particle accumulation rate and the relative velocity of the solid particles,thus increasing the interaction between the solid particles and the blade.Secondly,through the tracking of the solid particle trajectory in the impeller flow channel and the analysis of the vortex in the flow channel,the influence of the flow vortex on the trajectory of the sediment particle and the structural characteristics of the flow vortex are studied.The results show that the distribution of solid particles and the relative velocity are important factors affecting the wear of the end of the pressure surface of the blade and that the flow vortex affects the particle trajectory in the flow channel,which indirectly affects the distribution of the impeller wear area.The research findings can provide a guidance for the optimization and transformation of the double suction centrifugal pump impeller,and have some reference significance for the wear research.
作者
王杰
钱忠东
WANG Jie;QIAN Zhong-dong(State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China)
出处
《中国农村水利水电》
北大核心
2020年第6期120-124,共5页
China Rural Water and Hydropower
关键词
离心泵
泥沙磨损
数值模拟
double-suctions centrifugal pump
sediment erosion
numerical simulation
