Optimization design of multistage centrifugal pump impeller by orthogonal experiment and CFD
WANG Wei1, SHI Weidong1, JIANG Xiaoping1, FENG Qi1, LU Weigang1, ZHANG Desheng1,2
1.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang, Jiangsu 212013, China
Abstract:In order to improve the hydrodynamic performance of a typical cantilevered multistage centrifugal pump, orthogonal experiment and numerical simulation are carried out when four main impeller geometric parameters including blade outlet width, impeller diameter, number of blades and exit blade angle are changed. A computational fluid dynamics(CFD)code is employed to simulate the three-dimensional steady turbulent flows in the pumps with the designed impellers and the same diffuser. It is shown that the predicted pump performance curves present good agreement with the experimental ones for the original pump model, indicating the numerical prediction of performance is correct and reliable. According to the L9(34)experimental design table., nine impellers are designed and the head and efficiency of the pumps with these impellers are obtained at the duty point. Simultaneously, the effect of geometric parameters on the pump performance is concluded through variance analysis, eventually an optimal set of parameters are resulted. Afterwards, by a comparison of head and efficiency between the optimized and the original models, it is illustrated that there is a significant improvement in performance in the optimized model. It is the absence of swirling and reverse flows and less hydraulic losses as well as the large pressure gradient that are responsible for the performance improvement.
[1]徐伟幸,袁寿其. 低比速离心泵叶轮优化设计进展[J]. 流体机械,2006,34(2):39-42. XU Weixing, YUAN Shouqi. Advances in optimal design of low specific speed centrifugal pump impellers[J]. Fluid machinery, 2006, 34(2): 39-42.(in Chinese)[2]BYRNE D M, TAGUCHI S. The taguchi approach to parameter design[J].Quality progress, 1987, 20(12):19-26.[3]王洪亮,施卫东,陆伟刚,等. 基于正交试验的深井泵优化设计[J]. 农业机械学报,2010,43(5):56-63. WANG Hongliang, SHI Weidong, LU Weigang, et al. Optimization design of deep well pump based on Latin square test[J]. Transactions of the CSAM, 2010, 43(5):56-63.(in Chinese)[4]司乔瑞,袁寿其,王川,等. 低比速多级潜水泵性能优化[J]. 农业工程学报,2012,28(8):122-127. SI Qiaorui, YUAN Shouqi, WANG Chuan, et al. Optimal design of submersible multistage pumps with low specific speed[J]. Transactions of the CSAE, 2012, 28(8):122-127.(in Chinese)[5]施卫东,周岭,陆伟刚,等. 高扬程深井离心泵的正交试验与优化设计[J]. 江苏大学学报(自然科学版),2011,32(4):400-404. SHI Weidong, ZHOU Ling, LU Weigang, et al. Orthogonal test and optimization design of high-head deep-well centrifugal pump[J]. Journal of Jiangsu University(natural science edition), 2011, 32(4):400-404.(in Chinese)[6]WANG H, TSUKAMOTO H. Experimental and numerical study of unsteady flow in a diffuser pump at off-design conditions[J]. Journal of fluids engineering, 2003, 125(5):767-778.[7]ENGIN T, KURT A. Prediction of centrifugal slurry pump head reduction: an artificial neural networks approach[J]. Journal of fluids engineering, 2003, 125(1):199-202.[8]MAJIDI K. Numerical study of unsteady flow in a centrifugal pump[J]. Journal of turbomachinery, 2006, 127(2):363-371.[9]关醒凡. 现代泵技术手册[M]. 北京:中国宇航出版社,2011.[10]ROSS P J. Taguchi techniques for quality engineering[M]. New York: Mc-GrawHill, 1988.[11]王福军. 计算流体动力学分析——CFD软件原理与应用[M]. 北京:清华大学出版社,2004.[12]SHOJAEEFARD M H, TAHANI M, EHGHAGHI M B, et al. Numerical study of the effects of some geometric characteristics of a centrifugal pump impeller that pumps a viscous fluid[J]. Computers and fluids, 2012, 60:61-70.[13]CHOI Y D, KUROKAWA J, MALSUI J. Performance and internal flow characteristics of a very low specific speed centrifugal pump[J]. Journal of fluids enginee-ring, 2006, 128(2):341-349.[14]GOLCU M, PANCAR Y, SEKMEN Y. Energy saving in a deep well pump with splitter blade[J]. Energy conversion and management, 2006, 47(5):638-651.[15]沈艳宁,袁寿其,陆伟刚,等. 复合叶轮离心泵数值模拟正交试验设计方法[J]. 农业机械学报,2010,41(9):22-26. SHEN Yanning, YUAN Shouqi, LU Weigang, et al. Orthogonal test design method based on numerical simulation for non-overload centrifugal pump with complex impeller[J]. Transaction of the CSAM, 2010, 41(9):22-26.(in Chinese)[16]李晓俊,袁寿其,潘中永,等. 基于结构化网格的离心泵全流场数值模拟[J]. 农业机械学报,2013,44(7):50-54. LI Xiaojun, YUAN Shouqi, PAN Zhongyong, et al. Numerical simulation of whole flow field for centrifugal pump with structural grid[J]. Transaction of the CSAM, 2013, 44(7):50-54.(in Chinese)[17]张淑佳,李贤华,朱保林,等. k-ε涡黏湍流模型用于离心泵数值模拟的适用性[J]. 机械工程学报,2009,45(4):238-242. ZHANG Shujia, LI Xianhua, ZHU Baolin, et al. Applicability of k-ε eddy viscosity turbulence models on numerical simulation of centrifugal pump[J]. Journal of mechanical engineering, 2009, 45(4):238-242.(in Chinese)[18]曹卫东,刘光辉,施卫东,等. 多级离心泵内部非定常压力分布特性[J]. 农业工程学报,2014,30(14):64-70. CAO Weidong, LIU Guanghui, SHI Weidong, et al. Distribution of unsteady pressure in multistage centrifugal pump[J]. Transactions of the CSAE, 2014, 30(14):64-70.(in Chinese)[19]王秀勇,王灿星,黎义斌. 离心泵泵腔内部流动特征的数值分析[J]. 农业机械学报,2009,40(4):86-90. WANG Xiuyong, WANG Canxing, LI Yibin. Numerical study of flow characteristics in the impeller side chamber of centrifugal pump[J]. Transaction of the CSAM, 2007, 40(4):86-90.(in Chinese)[20]夏雨鑫. 低比转速化工离心泵的可靠性预测[J]. 流体机械,2014,42(5):43-46. XIA Yuxin.Prediction on the reliability of a low specific centrifugal pump[J]. Fluid machinery, 2014, 42(5):43-46.(in Chinese)