Investigation of CFD Calculation Method of a Centrifugal Pump with Unshrouded Impeller

查看全文 作　　者：WU [1,2]Dazhuan;YANG [1,2]Shuai;XU [1,2]Binjie;LIU [1,2]Qiaoling;WU [1,2]Peng;WANG [1,2]Leqin

机构地区：[1]Institute of Process Equipment, Zhejiang University;[2]Engineering Research Center of High Pressure Process Equipment and Safety of Ministry of Education, Zhejiang University

出　　处：《Chinese Journal of Mechanical Engineering》索引2014年第27卷第2期,共9页

基　　金：supported by National Natural Science Foundation of China(Grant No.51276213);Zhejiang Provincial Science and Technology Project of China(Grant No.2012R10001-07) 摘　　要：Currently, relatively large errors are found in numerical results in some low-specific-speed centrifugal pumps with unshrouded impeller because the effect of clearances and holes are not accurately modeled. Establishing an accurate analytical model to improve performance prediction accuracy is therefore necessary. In this paper, a three-dimensional numerical simulation is conducted to predict the performance of a low-specific-speed centrifugal pump, and the modeling, numerical scheme, and turbulent selection methods are discussed. The pump performance is tested in a model pump test bench, and flow rate, head, power and efficiency of the pump are obtained. The effect of taking into consideration the back-out vane passage, clearance, and balance holes is analyzed by comparing it with experimental results, and the performance prediction methods are validated by experiments. The analysis results show that the pump performance can be accurately predicted by the improved method. Ignoring the back-out vane passage in the calculation model of unshrouded impeller is found to generate better numerical results. Further, the calculation model with the clearances and balance holes can obviously enhance the numerical accuracy. The application of disconnect interface can reduce meshing difficulty but increase the calculation error at the off-design operating point at the same time. Compared with the standard k–ε, renormalization group k–ε, and Spalart–Allmars models, the Realizable k–ε model demonstrates the fastest convergent speed and the highest precision for the unshrouded impeller flow simulation. The proposed modeling and numerical simulation methods can improve the performance prediction accuracy of the low-specific-speed centrifugal pumps, and the modeling method is especially suitable for the centrifugal pump with unshrouded impeller. 关键词：离心泵叶轮 CFD计算性能预测预测精度建模方法低比转速三维数值模拟数值模拟方法

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Investigation of CFD Calculation Method of a Centrifugal Pump with Unshrouded Impeller

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