Abstract:In order to develop a CFD-based method for predicting hydraulic performance of multistage centrifugal pump, a multistage centrifugal pump is selected as the study object, and the information of flow field in the whole pump is obtained as well. Specially, the three-dimensional flow domain models of single-, two- and three-stage for the pump are generated and the hydraulic loss across each through-flow component in every stage in those models is obtained. It is shown that the hydraulic loss across a through-flow component in the single-stage model is basically similar to that across the counterpart in the two- or three-stage model, implying the loss is independent of the number of stages chosen and a model with less number of stages can be used to predict performance of a multistage centrifugal pump. By analyzing the energy loss in the models of multistage centrifugal pump to demonstrate the loss characteristics and flow features in each stage, it is found that the vortex structure is nearly consistent across every stage except the diffuser in the last stage. By making use of energy analysis combined with vortex dynamics approach, a set of formulas for predicting the performance of multistage centrifugal pump are established according to a computational model with a few stages.
[1]汪家琼, 孔繁余. 多级离心泵叶轮与导叶水力性能优化研究[J]. 华中科技大学学报(自然科学版), 2013, 41(3):92-96. WANG Jiaqiong, KONG Fanyu. Optimization on multistage centrifugal pump impeller and guide vane hydraulic performance[J].Journal of Huazhong University of Scie-nce and Technology(natural science edition), 2013,41(3):92-96.(in Chinese)[2]宋志光. 多级离心泵导叶流动性能及优化设计的研究[D]. 广州:华南理工大学, 2014.[3]薛睿, 李家文, 唐飞. 多级泵级间导叶的优化与数值仿真[J]. 火箭推进, 2011, 37(5):24-29. XUE Rui, LI Jiawen, TANG Fei. Multistage pump interstage guide blade optimization and numerical simulation[J]. Rocket propulsion, 2011, 37(5):24-29.(in Chinese)[4]吴大转, 许斌杰, 武鹏,等. 多级离心泵内部间隙流动与泄漏损失[J]. 浙江大学学报(工学版), 2011, 45(8):1393-1398. WU Dazhuan, XU Binjie, WU Peng, et al. Multistage centrifugal pump clearance leakage flow and internal loss[J]. Journal of Zhejiang University(engineering science edition),2011,45(8):1393-1398.(in Chinese)[5]赵阳. 轴流泵叶轮与导叶轴向间隙内流场的3D-PIV测量[D]. 扬州:扬州大学, 2006.[6]李伟, 施卫东, 蒋小平,等. 多级离心泵平衡装置间隙流动的数值计算[J]. 中国农村水利水电, 2012(12):137-139. LI Wei, SHI Weidong, JIANG Xiaoping, et al. Multistage centrifugal pump balance device clearance flow numerical calculation[J]. Chinese rural water conservancy and hydroelectric power, 2012(12):137-139.(in Chinese)[7]王广业. 不锈钢冲压焊接多级离心泵叶轮优化设计及CFD分析[D]. 淄博:山东理工大学, 2006.[8]钱万钧. 低比转速多级泵优化设计探讨[J]. 通用机械, 2009(10):43-45. QIAN Wanjun. Research on the design of multistage pump and optimization of low specific speed pump[J]. General machinery, 2009(10):43-45.(in Chinese)[9]刘超. 一种新的模糊神经网络的多级离心压缩机性能预测方法[J]. 计算机测量与控制, 2013, 21(9):2422-2424. LIU Chao. A new kind of fuzzy neural network method of multistage centrifugal compressor performance prediction[J]. Computer measurement and control, 2013,21(9):2422-2424.(in Chinese)[10]魏培茹, 刘卫伟, 见文. 多级离心泵内部流动的数值模拟与优化[J]. 流体机械, 2010, 38(9):31-34. WEI Peiru, LIU Weiwei, JIAN Wen. Numerical simulation and optimization on the internal flow of multistage centrifugal pump[J]. Fluid machinery,2010, 38(9):31-34.(in Chinese)[11]SCHIFFMANN J, FAVRAT D. Design, experimental investigation and multi-objective optimization of a small-scale radial compressor for heat pump applications[J]. Energy, 2010,35:436-450.[12]吴宏, 蒋洪德. 燃气轮机压气机涡量动力学理论及分析方法[J]. 航空动力学报, 2013, 28(4):903-910. WU Hong, JIANG Hongde. Theoretical and analytical methods of the gas turbine compressor vorticity dynamics [J]. Journal of aerospace power, 2013, 28(4): 903-910.(in Chinese)[13]张梁, 刘树红, 张乐福,等. 混流式转轮内部流场的涡动力学分析[J]. 水力发电学报, 2007, 26:106-110. ZHANG Liang, LIU Shuhong, ZHANG Lefu, et al. Vorticity dynamics analysis of internal flow field of Francis Runner[J]. Journal of hydroelectric power,2007,26:106-110.(in Chinese)[14]ZHANG Desheng, SHI Weidong, VAN Esch B P M, et al. Numerical and experimental investigation of tip lea-kage vortex trajectory and dynamics in an axial flow pump[J]. Computers & fluids, 2015,112:61-71.