Numerical calculation and analysis on axial thrust in screw centrifugal pump
LI Ren-Nian, QUAN Hui, HAN Wei, LI Qi-Fei, SU Qing-Miao
(1. School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou,Gansu 730050, China; 2. School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou,Gansu 730050, China)
Abstract：When the axial thrust is estimated in a screw centrifugal pump under solidliquid twophase flow conditions by means of ordinary analytical methods, there exists problems, such as mathematic models establishment of flow and difficulties in closure of the models. Thus in order to predict the axial thrust precisely and to correlate it to the physical property parameters of the medium handled by the pump, the axial thrust in the screw centrifugal pump of type 150×100LN-32 was calculated when it transported a sandwater twophase fluid by using CFD codeFluent. The twophase flow in the pump was described by the timeaveraged Navier-Stokes equations in relative coordinate systems and the mixture model. The standard k-ε twoequation turbulence model and the SIMPLE algorithm were used in numerical simulations. An axial thrust was calculated after the pressure distributions in the pump were available. In this way, the problems and the difficulty aforementioned can be avoided. The relations of axial thrust to solid volume fraction, particle diameter and flow rate of the twophase flow were explored by using the computational results. The results showed that the axial thrust rises with increasing solid volume fraction, but reduces with increasing flow rate and particle diameter. The conclusion is of great significance for improving the stability of the pump and extending its lifespan.
李仁年1, 权辉1, 韩伟1, 李琪飞1, 苏清苗2. 螺旋离心泵轴向力的数值计算与分析[J]. 排灌机械工程学报, 2012, 30(5): 527-531.
LI Ren-Nian-1, QUAN Hui-1, HAN Wei-1, LI Qi-Fei-1, SU Qing-Miao-2. Numerical calculation and analysis on axial thrust in screw centrifugal pump. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(5): 527-531.
［1］Elsevier Science Ltd. Experimental evaluation of axial thrust in pump［J］. World Pumps, 1999 (393): 34-37.［2］Stepanoff A J. Centugal and Axial Flow Pumps: Theory, Design, and Application［M］. New York: John Wiley ＆ Sons Inc,1948.［3］关醒凡.现代泵技术手册［M］.北京:中国宇航出版社,2011.［4］高红俐,杨继隆,叶力,等.分段式多级离心泵的轴向力计算［J］.水泵技术,2000(2):8-12.Gao Hongli, Yang Jilong, Ye Li, et al. Axial force calculation of segmented multistage centrifugal pump ［J］. Pump Technology,2000(2):8-12.(in Chinese)［5］李仁年,陈冰,韩伟,等.变螺距螺旋离心泵叶片型线参数方程的分析［J］.排灌机械,2007, 25 (6):1-3.Li Rennian, Chen Bing, Han Wei, et al. Analysis of vane profile parameter equation for variablepitch screw centrifugal pump.［J］.Drainage and Irrigation Machinery,2007,25(6):1-3. (in Chinese)［6］Van H K, Bailey J, Majumdar A. Numerical prediction of transient axial thrust and internal flows in a rocket engine turbopump［C］//Proceedings of the 35th AIAA／ASME／SAE／ASEE Joint Propulsion Conference and Exhibit. Los Angeles:［s.n.］, 1999.［7］Gantar Marjan, Florjancic Dusan, Sirok Brane. Hydraulic axial thrust in multistage pumps origins and solutions ［J］. Journal of Fluids Engineering, 2002, 124 (2):336-341.［8］Rikke K B. Flow in a centrifugal pump impeller at design and offdesign conditions—Part II:Large eddy simulations ［J］. Journal of Fluids Engineering,2003,125(1):73-83.［9］施卫东,李启锋,陆伟刚,等.基于CFD的离心泵轴向力计算与试验［J］.农业机械学报,2009,40(1):61-63.Shi Weidong, Li Qifeng, Lu Weigang, et al. Estimation and experiment of axial thrust in centrifugal pump based on CFD［J］. Transaction of the Chinese Society for Agricultural Machinery, 2009,40(1):61-63.(in Chinese)［10］王福军.CFD在水力机械湍流分析与性能预测中的应用［J］.中国农业大学学报,2005,10(4):75-80.Wang Fujun. Application of CFD to turbulent flow anlysis and performance prediction inhydraulic machinery［J］. Journal of China Agricultural University, 2005,10(4):75-80.(in Chinese)［11］张启华,施卫东,陆伟刚.新型深井离心泵轴向力的数值计算及平衡分析［J］.排灌机械, 2007,25(6):7-10.Zhang Qihua,Shi Weidong,Lu Weigang. Numerical calculation of axical force and balancing newtype deep well pump［J］. Drainage and Irrigation Machinery,2007,25(6):7-10.(in Chinese)［12］李仁年,王秋红,沈建锋,等.螺旋离心泵内固液两相流的数值模拟［J］.流体机械,2008,12(36):24-25.Li Rennian, Wang Qiuhong, Shen Jianfeng, et al. Numerical simulation of solidliquid twophase flow in the screw centrifugal pump［J］.Fluid Machinery,2008, 12(36): 24-25. (in Chinese)［13］李仁年,王秋红.固液两相流对螺旋离心泵流场影响的数值分析［J］.兰州理工大学报,2009,35(2):52-53.Li Rennian, Wang Qiuhong. Numerical analysis of influence of solidliquid twophase flow on flow field in screw centrifugal pump［J］.Journal of Lanzhou University of Technology,2009,35(2):52-53.(in Chinese)
