Abstract：The standard k-ε turbulence model, homogeneous multiphase model and Rayleigh-Plesset equation were applied to simulate cavitation characteristics in a centrifugal pump with specific speed of 94 under different conditions based on ANSYS CFX software. According to the simulation results, the energy characteristics under the no-cavitation conditions and cavitation characteristics of the model pump were predicted, and the vapor volume distribution on the middle stream surface of impellerand the blade loading characteristics on the middle stream line under different cavitation conditionswere analyzed. The comparison between prediction values and experimental values indicates that the prediction results are accurate to some extent, and the absolute errors of net positive suction head under different conditions are 0.25, 0.29 and 0.06 m, respectively. The flow field analysis indicates that the vapors generated at suction side of blade near the leading edge at firstand then extended to the outlet of impeller with the reduction of inlet total pressure. Compared with other blades, the loading on the blade that against the volutetongue is the least and the loading on the other blades at the relative position of 0.35-0.80increased obviously with the deterioration of cavitation condition,which shows that the blade loading is significantly affected by cavitation.
王 勇, 刘厚林, 袁寿其, 谈明高, 王 凯. 离心泵内部空化特性的CFD模拟[J]. 排灌机械工程学报, 2011, 29(2): 99-103.
Wang Yong， Liu Houlin， Yuan Shouqi， Tan Minggao， Wang Kai. CFD simulation on cavitation characteristics in centrifugal pump. Journal of Drainage and Irrigation Machinery Engin, 2011, 29(2): 99-103.
［1］Brennen C E.Hydrodynamics of Pumps［M］. Oxford:Oxford University Press,1994.［2］Dular M,Bachert R,Bernd S,et al.Experimental evaluation of numerical simulation of cavitating flow around hydrofoil［J］. European Journal of Mechanics B:Fluids,2005,24:522-538.［3］张乐福,张 亮,张 梁,等.混流式水轮机的三维空化湍流计算［J］.水力发电学报,2008,27(1):135-138.Zhang Lefu,Zhang Liang,Zhang Liang,et al. 3D cavitation turbulent flow simulation of Francis turbine［J］. Journal of Hydroelectric Engineering ,2008,27(1):135-138.(inChinese)［4］陈庆光,吴玉林,刘树红,等.轴流式水轮机全流道内非定常空化湍流的数值模拟［J］.机械工程学报,2006,42(6):211-216.Chen Qingguang,Wu Yulin,Liu Shuhong,et al.Numerical simulation of unsteady cavitating turbulent flow in the whole flow passage of a Kaplan turbine ［J］. Journal ofMechanical Engineering ,2006,42(6):211-216.(in Chinese)［5］甘加业,薛永飞,吴克启.混流泵叶轮内空化流动的数值模拟［J］.工程热物理学报,2007,28(S1):165-168.Gan Jiaye,Xue Yongfei,Wu Keqi.Numerical prediction of cavitation in a mixed flow pump［J］. Journal of Engineering Thermophysics ,2007,28(S1):165-168.(in Chinese)［6］Medvitz R B,Kunz R F,Boger D A,et al.Performance analysis of cavitating flow in centrifugal pumps using multiphase CFD［J］. Journal of Fluids Engineering,2002,124(2):377-383.［7］Liu Houlin,Wang Yong,Yuan Shouqi,et al.Effect of blade number on characteristics of centrifugal pumps［J］. Chinese Journal of Mechanical Engineering, 2010,23(6):742-747.［8］刘 宜,张文军,杜 杰.离心泵内部空化流动的数值预测［J］.排灌机械,2008,26(3):19-21,29.Liu Yi,Zhang Wenjun,Du Jie.Numerical prediction of cavitation flow in centrifugal pump［J］. Drainage and Irrigation Machinery ,2008,26(3):19-21,29.(in Chinese)［9］何希杰,劳学苏.离心泵效率计算若干公式评价［J］.水泵技术,2009(6):16-19.He Xijie,Lao Xuesu.The evaluation of some formulas for calculating efficiency of centrifugal pumps［J］. Pump Technology ,2009(6):16-19.(in Chinese)［10］Jeanty F,Andrade J D,Asuaje M,et al. Numerical simulationof cavitation phenomena in a centrifugal pump［C］∥ Proceedings of the ASME 2009 FluidsEngineering Division Summer Meeting ,2009.
