Abstract：The experiments on different types of impeller are done by changing the clearance of wear-ring to prove that the clearance has no influence on the pump efficiency under various types of impeller.An algorithm for calculating the disc friction loss is developed in terms of energy conservation with consideration of the leakage rate.Based on this algorithm,a formula on the efficiency of a low specific speed centrifugal pump is deduced on the premise that the leakage rate is taken as the independent variable.Combined with formulas of hydraulic efficiency and volume efficiency,the conclusion is drawn that the pump efficiency decreases with the increasing clearances of wear-rings even though the mechanical losses decrease with the increasing of leakage rate.
王洋；张翔. 叶轮口环间隙对低比转速离心泵效率的影响[J]. 排灌机械工程学报, 2008, 26(6): 27-30.
WANG Yang, ZHANG Xiang. Effect of clearance of impeller wear-rings on efficiency of low specific speed centrifugal pump. Journal of Drainage and Irrigation Machinery Engin, 2008, 26(6): 27-30.
[1] 李文广,费振桃,蔡永雄.离心油泵叶轮口环间隙对性能的影响[J].水泵技术,2004(5):7-13[2] 陈鱼,费振桃,蔡永雄.输送清水时口环间隙对离心油泵性能的影响[J].流体机械,2006,34(1):1-5[3] 关醒凡.现代泵技术手册[M].北京:宇航出版社,1995:11[4] 查森.叶片泵原理及水力设计[M].北京:机械工业出版社,1988:187-200[5] Gulich J F.Disk friction losses of closed turbomachine impellers[J].Forschung im Ingenieurwesen/Engineering Research,2003,68:87-95[6] Gulich J F.Effect of reynolds number and surface roughness on the efficiency of centrifugal pumps[J].Transactions of the ASME,2003,125(7):670-679[7] 何希杰,劳学苏.离心泵系数法设计新的统计曲线和公式[J].水泵技术,1997(5):30-37[8] Nemdili A,Hellmann D H.Investigations on fluid friction of rotational disks with and without modified outlet sections in real centrifugal pump casings[J].Forschung Im Ingenieurwesen-engineering Research,2007,71:59-67[9] 刘厚林,谈明高,袁寿其.离心泵圆盘摩擦损失计算[J].农业工程学报,2006,22(12):107-109
