Numerical analysis of effect of sand volume fractions on erosion characteristics of centrifugal pump
ZHAO Weiguo1,2, ZHENG Yingjie1,2, LIU Yi1,2, HAN Xiangdong1,2
1.School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050,China; 2. Key Laboratory of Fluid Machinery and System of Gansu Province, Lanzhou, Gansu 730050, China
Abstract:In order to study the effect of sand volume fractions on erosion characteristics of the centrifugal pump in sandladen water flow, RNG k-ε turbulence model, SIMPLE algorithm, discrete phase model, Finnie ductile material erosion model, and Rosin-Rammler particle size distribution approach were employed. The full threedimensional numerical simulation about solid-liquid twophase flow in the singlestage singlesuction centrifugal pump with a specific speed of 196 was carried out by using Fluent software, and the effect of wall roughness was taken into account. By comparing the test data of the external characteristics of fresh water pump to the numerical simulation result, the reliability of numerical calculation method was verified. The results show that with the increasing of sand volume fractions, the erosion intensity of the centrifugal pump increases gradually, and the key sand erosion position is concentrated on start side of blade, suction side of blade, pressure side of blade close to the blade outlet and the volute near the second section and the fourth section. Additionally, sand tracks tend to be mussy, and head and efficiency of the pump are decreased gradually.
[1]刘娟,许洪元,齐龙浩.水力机械中冲蚀磨损规律及抗磨措施研究进展[J].水力发电学报,2005,24(1):113-117.LIU Juan,XU Hongyuan,QI Longhao. The development of study on the abrasive rules and antiabrasive technique of hydraulic machines[J]. Journal of hydroelectric engineering,2005,24(1):113-117.(in Chinese)[2]周林玉. 偏离工况下离心泵的压力脉动和振动分析[J]. 流体机械, 2015,43(2):52-55.ZHOU Linyu. Analysis on pressure fluctuation and vibration of a centrifugal pump for offdesign conditions[J]. Fluid machinery, 2015,43(2):52-55.(in Chinese)[3]李仁年,韩伟,刘胜,等.小粒径固液两相流在螺旋离心泵内运动的数值分析[J].兰州理工大学学报,2007,33(1):55-58.LI Rennian,HAN Wei,LIU Sheng,et al. Numerical analysis of interior flow in screw centrifugal pump for liquid-solid twophase medium with small size particles[J].Journal of Lanzhou University of Technology,2007,33(1):55-58.(in Chinese)[4]杨从新,董富弟,程效锐,等.含沙水流中粒径对离心泵叶轮磨损特性影响的数值分析[J].兰州理工大学学报,2014,40(4):45-50.YANG Congxin,DONG Fudi,CHENG Xiaorui,et al. Numerical analysis of effect of sand particle size of siltladen water flow on wear characteristics of centrifugal pump impeller[J].Journal of Lanzhou University of Technology,2014,40(4):45-50.(in Chinese)[5]刘娟,许洪元,唐澍,等.离心泵内固体颗粒运动规律与磨损的数值模拟[J].农业机械学报,2008,39(6):54-59.LIU Juan,XU Hongyuan,TANG Shu,et al.Numerical simulation of erosion and particle motion trajectory in centrifugal pump[J].Transactions of the CSAM,2008,39(6):54-59.(in Chinese)[6]汪家琼,蒋万明,孔繁余.固液两相流离心泵内部流场数值模拟与磨损特性[J].农业机械学报,2013,44(11):53-60.WANG Jiaqiong,JIANG Wanming,KONG Fanyu,et al.Numerical simulation of solid-liquid twophase turbulent flow in centrifugal pump based on particle model[J].Transactions of the CSAM,2013,44(11):53-60.(in Chinese)[7]〓WU Bo, YAN Hongzhi, XU Hailiang, et al. Numerical simulation about erosion characteristics of solid particle in slurry pump[J]. Journal of Central South University(science and technology), 2012, 43(1):124-129.[8]〓[JP2]Help navigator.ANSYS,release 150 ANSYS fluent theo[JP]ry guide[M].New York:Ansys Inc,2013.[9]邵晨, 王小鹏, 邢桂坤,等. 石油化工装置离心泵最小流量浅析[J]. 化工设备与管道, 2015, 52(6):51-54.SHAO Chen, WANG Xiaopeng, XING Guikun, et al. Analysis of minimum flow of centrifugal pump used in petrochemical plant[J].Process equipment & piping, 2015, 52(6):51-54.(in Chinese)[10]〓范贤旗.离心泵泥沙磨损机理的数值研究[D].陕西:西安理工大学,2011.[11]〓赵啸冰.渣浆泵内清水流场及离散固体颗粒轨迹的模拟与研究[D].北京:清华大学,2002.[12]董文龙,李昳.离心泵内大颗粒下运动特性数值模拟与磨损分析[J].机电工程,2015,32(3):324-327.DONG Wenlong,LI Yi.Numerical simulation of erosion and particle motion trajectory in centrifugal pump with major diameter particles[J].Journal of mechanical & electrical engineering,2015,32(3):324-327.(in Chinese)[13]〓LI G,WANG Y,HE R,et al. Numerical simulation of predicting and reducing solid particle erosion of solid-liquid twophase flow in a choke[J].Petroleum science,2009,6(1):91-97.[14]〓LI Yi,ZHU Zuchao,HE Weiqiang,et al. Numerical simulation and experimental research on the influence of solid-phase characteristics on centrifugal pump performance[J].Chinese journal of mechanical engineering,2012,25(6):1184-1189.