Abstract:To investigate the characteristics of solid-liquid two-phase flow in a screw axial-flow pump, the internal flow field inside the flow passages of the pump were numerically simulated by using Ansys CFX software with the RNG k-ε turbulence model. The diameter of sand is 2 mm, and sand initial volume fractions are 5%, 10% and 15%, respectively; whilst the initial volume fractions of oil are 5%, 10% and 15% as well. It was demonstrated that sand and oil are mainly accumulated around the leading edge of blade on the hub, and at the impeller tip. If the initial volume fractions of sand and oil are changed, then their distributions in the flow passages are changed simultaneously, and the areas with a higher concentration of them are varied too, indicating that both sand and oil phases can influence the distribution of each other in the flow passages. When the initial volume fractions of sand and oil are kept constant, the relative velocity pattern of every phase in the flow passages generally tends to be consistent with each other. The magnitude of the relative velocity of sand is the highest, but that of water is the lowest, and that of oil is in between. The estimated head and efficiency curves are essentially consistent with the experimental ones because the errors in head and efficiency between estimate and measurement are 3% and 4% only. This suggests that the performance test protocol is reasonable and feasible, and the numerical simulation results are relatively accurate.
朱荣生,, 林鹏, 龙云, 王振伟, 习毅. 螺旋轴流泵的固液两相流动数值模拟[J]. 排灌机械工程学报, 2014, 32(1): 6-11.
Zhu Rongsheng,, Lin Peng, Long Yun, Wang Zhenwei, Xi Yi. Numerical simulation of solid-liquid two-phase flow in screw axial-flow pump. Journal of Drainage and Irrigation Machinery Engin, 2014, 32(1): 6-11.
[1]付强,袁寿其,朱荣生,等.离心泵气液固多相流动数值模拟与试验[J].农业工程学报,2012,28(14):52-57. Fu Qiang,Yuan Shouqi, Zhu Rongsheng,et al. Numerical simulation and experiment on gas-liquid-solid multiphase flow in centrifugal pump[J].Transactions of the CSAE, 2012,28(14):52-57.(in Chinese)[2]Li Wei, Shi Weidong, Jiang Xiaoping,et al. Analysis on internal solid-liquid two-phase flow in the impellers of sewage pump[J]. Procedia Engineering, 2012, 31:170-175.[3]Noghrehkar G R, Kawaji M, Chan A M C, et al. Investigation of centrifugal pump performance under two-phase flow conditions [J]. Journal Fluids Engineering, 1995, 117(3): 129-137.[4]Tang Xuelin, Wang Fujun, Wu Yulin. An improved large eddy simulation of two-phase flows in a pump impeller [J].ACTA Mechanica Sinica, 2007, 23(6): 635-643.[5]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].兰州理工大学学报,2009,35(2):51-54. Li Rennian, Wang Qiuhong. Numerical analysis of influence of solid/liquid two-phase flow on flow field in screw centrifugal pump [J]. Journal of Lanzhou University of Technology, 2009,35(2):51-54.(in Chinese)[6]刘栋,杨敏官,高波. 离心泵叶轮内部伴有盐析流场的PIV试验[J]. 农业机械学报,2008,39(1):55-58,63. Liu Dong, Yang Minguan, Gao Bo. PIV measurement of flow with salt-out in centrifugal pump[J]. Transactions of the Chinese Society for Agricultural Machinery, 2008, 39(1): 55-58, 63.(in Chinese)[7]杨敏官,顾海飞,刘栋,等. 离心泵叶轮内部湍流流动的数值计算及试验[J]. 机械工程学报,2006,42(12):180-185. Yang Minguan, Gu Haifei, Liu Dong, et al. Numerical simulation and experiment study for turbulent flow in the impeller of centrifugal pump[J]. Journal of Mechanical Engineering, 2006, 42(12): 180-185.(in Chinese)[8]李斌,戚蒿,郭岳新,等. 圆盘泵叶轮结构改进及固液两相流的数值模拟[J]. 排灌机械,2009,27(2):95-99. Li Bin, Qi Hao, Guo Yuexin, et al. Structure improvement of disc pump and its solid/liquid two-phase flow simulation[J]. Drainage and Irrigation Machinery, 2009, 27(2): 95-99.(in Chinese)[9]刘建瑞,徐永刚,王董梅,等. 离心泵叶轮固液两相流动及泵外特性数值分析[J]. 农业机械学报,2010,41(3): 86-90. Liu Jianrui, Xu Yonggang, Wang Dongmei,et al. Numerical simulation of solid-liquid two-phase turbulent flow in impeller channel and pump characteristics analysis[J]. Transactions of the Chinese Society for Agricultural Machinery, 2010, 41(3): 86-90.(in Chinese)[10]赵斌娟,袁寿其,刘厚林,等. 基于Mixture 多相流模型计算双流道泵全流道内固液两相湍流[J].农业工程学报,2008,24(1):7-12. Zhao Binjuan, Yuan Shouqi, Liu Houlin, et al. Simulation of solid-liquid two-phase turbulent flow in double-channel pump based on Mixture model[J]. Transactions of the CSAE, 2008, 24(1):7-12.(in Chinese)[11]徐海良,屈科辉. 双流道泵固液两相流的数值计算与分析[J].广西大学学报:自然科学版,2010,35(2):249-253. Xu Hailiang, Qu Kehui. Numerical calculation and analysis of solid-liquid two-phase flow in double-channel pump[J]. Journal of Guangxi University:Natural Science Edition, 2010, 35(2):249-253.(in Chinese)[12]齐学义,阎晓伟,姬孝斌,等. 双流道污水泵内固相体积分数分布规律 [J]. 江苏大学学报:自然科学版,2009,30(2):156-159. Qi Xueyi, Yan Xiaowei, Ji Xiaobin, et al. Volume fraction distribution rules for solid-phase in double channel sewage pump[J].Journal of Jiangsu University:Natural Science Edition, 2009, 30(2): 156-159.(in Chinese)[13]王春刚.混流式脱硫泵参数化三维建模及磨损特性分析[D].北京:华北电力大学能源与动力工程学院,2010.[14]Schneider G E, Raw M J.Control volume finite-element method for heat transfer and fluid flow using collocated variables:Computational procedure[J]. Numerical Heat Transfer, 1987, 11(4):363-390.[15]Stephan B, Thomas P, Peer S. Effects of impeller geometry on reliability and costs of waste water pumps [J]. World Pumps, 2004(452): 34-38.[16]Sakr S A. Type curves for pumping test analysis in coast alaquifers [J]. Ground Water, 2001, 39(1):5-9.