大型双吸离心泵内流场的数值模拟与性能预估  

Numerical Simulation and Performance Forecast of Flow Field in Large Double-Suction Centrifugal Pump

作　　者：徐存东[1] 南瑞芳 谢利云 王亚楠[1] 魏怀东[2] 

机构地区：[1]华北水利水电大学水利学院,河南郑州450011 [2]甘肃省治沙研究所,甘肃武威733000

出　　处：《人民黄河》2014年第5期126-129,共4页Yellow River

基　　金：国家自然科学基金资助项目(51279064;31360204);华北水利水电大学高层次人才科研启动计划项目(201069)

摘　　要：针对高扬程大流量的大型双吸离心泵的汽蚀问题进行了数值模拟。依据k-ε紊流模型加壁面函数法对叶轮内的三维紊流流动进行数值计算与分析,采用雷诺时均Navier-Stokes方程进行模拟并通过压力耦合方程组的半隐式方法进行求解。利用FLUENT软件模拟得到叶片流速分布、压力分布及全流道流线分布图,分析出离心泵叶轮通道内的流动规律,并将模拟结果与试验值进行对比,可知在设计工况点时相对误差最小,扬程相对误差为1.75%,效率相对误差为2.27%。结果表明:利用计算流体动力学进行三维紊流数值模拟可以反映大型双吸离心水泵内部真实流动,效率的变化趋势符合离心泵工作特性的一般规律,模拟结果与试验结果一致。Numerical simulation was carried out in allusion to the cavitation problem of large double-suction centrifugal pump. Three-dimensional turbulence on the impeller was conducted numerical computation and analysis based on standard k-εturbulence model and the wall function. Simu-lation was carried out by adopting time-averaged N-S equations,and a SIMPLE-based semi-implicit solution algorithm was applied to calculate. The distribution maps,those that involved the blade velocity,pressure and the full passage flow line,were used to analyze the flow law of impeller chan-nel in centrifugal pump by FLUENT Software. Compared with the simulation results and test value,the conclusion that relative error was the mini-mal when designing point was 1. 0 Q could be obtained,and the relative error of lift and efficiency was 1. 75% and 2. 27% respectively. The re-sults show that the computational fluid dynamics （CFD）can be used to conduct three-dimensional numerical simulation of turbulent flow,which can reflect the internal real flow of large double-suction centrifugal pump,and the change trend of efficiency conforms to the general law of the working characteristics of centrifugal pump. Simulation results are identical with the conclusion by experiment.

关 键 词：大型双吸离心泵 叶轮 内部流态 三维紊流 数值计算 

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