Experimental study of the effect of blade tip clearance and blade angle error on the performance of mixed-flow pump

查看全文 作　　者：BING [1]Hao;CAO [1]ShuLiang;HE [2]ChengLian;LU [3]Li

机构地区：[1]State Key Laboratory of Hydroscience and Engineering,Tsinghua University;[2]Beifang Investigation,Design & Research CO.Ltd;[3]Hydraulic Machinery Department,China Institute of Water Resources and Hydropower Research

出　　处：《Science China(Technological Sciences)》索引2013年第56卷第2期,共6页

基　　金：supported by the National Natural Science Foundation of China (Grant No. 51176088) 摘　　要：The hydraulic performance test of the mixed-flow pump has been carried out through selecting different blade tip clearances and various blade angle errors.The ratio of the mixed-flow pump efficiency reduction and the blade tip clearance variation(η/δ) varies with the flow rate coefficient revealing a parabolic trend.An empirical equation has been developed for the mixed-flow pump model by parabolic fitting.For the same blade tip clearance variation δ,the mixed-flow pump efficiency reduction η increases rapidly as the flow rate rises.For any given flow rate,the efficiency,the head and the shaft power of the mixed-flow pump all decrease with the increase of the blade tip clearance.Among them,the efficiency reduction η varies approximately linearly with the blade tip clearance variation δ.When the angle of an individual blade of the mixed-flow pump has a deviation,the performance curves will move and change.These curves have consistent change directions with the performance curves under the condition of all the blades rotated at the same time,but have smaller offset and lower range of variation.When an individual blade angle error changes to ±2°,the optimal efficiency of the mixed-flow pump will have no significant difference.When the individual blade angle error increases to ±4°,the optimal efficiency will decrease by 1%. 关键词：叶尖间隙角度误差混流泵性能测试叶片实验性能曲线刀片式服务器

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Experimental study of the effect of blade tip clearance and blade angle error on the performance of mixed-flow pump

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