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

Science China(Technological Sciences) 2013年第2期56卷 293-298页

作者： BING Hao CAO ShuLiang HE ChengLian LU Li State Key Laboratory of Hydroscience and Engineering Tsinghua University Beifang Investigation Design & Research CO.Ltd Hydraulic Machinery Department China Institute of Water Resources and Hydropower Research

The hydraulic performance test of the mixed-flow pump has been carried out through selecting different blade tip clearances and various blade angle *** 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 *** empirical equation has been developed for the mixed-flow pump model by parabolic *** the same blade tip clearance variation δ,the mixed-flow pump efficiency reduction η increases rapidly as the flow rate *** 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 *** 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 *** 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 *** an individual blade angle error changes to ±2°,the optimal efficiency of the mixed-flow pump will have no significant *** the individual blade angle error increases to ±4°,the optimal efficiency will decrease by 1%.

关键词： mixed-flow pump model test hydraulic performance blade tip clearance blade angle

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Topology and Vortex Structures of Turbine Cascade with Different tip clearances

引用

Chinese Journal of Aeronautics 2002年第1期15卷 18-26页

作者：韩万金杨庆海黄洪雁贾琳 Academy of Energy Science and Engineering Harbin Institute of Technology Harbin 150001 China

This paper uses the topology theory to analyze the surface flowspectrums of straight, positively curved and negatively curvedcascades with relative tip clearances of 0.023 and 0.036, findsapparent differences of topology and vortex structures in the bladetip and the suction side wall corner of single type of cascade withthis two clearances, and studies the mechanism of the differenceformation as well as their effects o the energy loss.

关键词： turbine cascade blade tip clearance flow visualization topology andvortex structures

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