不同离散格式下的离心泵内部流动数值模拟研究  

Numerical Simulation on a Centrifugal Pump Under Different Discrete Scheme

作　　者：吴大转[1] 黄滨[1] 胡芳芳[1] 武鹏[1] 王乐勤[1] 

机构地区：[1]浙江大学化工机械研究所,浙江杭州310027

出　　处：《工程热物理学报》2012年第1期55-58,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50906074);中央高校基本科研业务费专项资金资助

摘　　要：为研究离散格式对离心泵性能预测精度的影响,本文以自吸式离心泵为计算模型,采用Realizableκ-ε湍流模式进行三维内流场的数值模拟研究,分析了从零流量到最大工作流量下的内部流动和水力性能。建立了考虑内部间隙影响的自吸式离心泵全三维计算模型,分析了动量方程对流项采用一阶差分和二阶差分格式对计算精度的影响,同时分析了压力项的Standard和PRESTO离散格式对计算精度的影响。结果表明,在小流量工况下,采用二阶迎风格式具有较高的计算精度,而在大流量工况下采用一阶迎风格式更为合适。该结果可为准确预测离心泵全工况外特性提供参考依据。A self-priming pump was adopted to research the effects of discrete scheme on performance prediction accuracy of the centrifugal pump. The Realizable k - s turbulent model was applied to simulate the three dimensional flow in a self-priming pump, and the pump performance from zero flow-rate to maximal flow-rate were analyzed. The three dimensional model considering seal clearance was set up, and then the effects of first-order differential and second-order differential scheme of convection item in the momentum equation on calculation precision were analyzed, as well as the Standard and PRESTO differential scheme of pressure item. The results show that the second-order differential scheme has higher accuracy for solving the small flow-rate condition of pump, and the first-order differential is more appropriate for large flow-rate condition. Such result provides reference for accurate perforraance prediction of a centrifugal pump in full operating condition.

关 键 词：自吸式离心泵 数值模拟 性能预测 离散方式 

分 类 号：TH311[机械工程—机械制造及自动化]