Abstract In the research of influence of geometrical parameters of splitter blades on centrifugal pump performance, the regularity of ranking of the parameters and its reliability should be emphasized. Consequently, the comprehensive influence and its regularity of splitter pitch relative to the full length blade β, deflecting angle α, dimensionless inlet diameter and number of blades Z on the pump head and efficiency is analyzed in detail by using the grey theory. The results of the ranking by which the four geometrical parameters influence the head and efficiency are obtained by means of a lot of calculations. The result showed that the effect of the splitter pitch relative to the full length blade β on the pump head was the largest, the deflecting angle α is the smallest, the dimensionless inlet diameter and number of blades Z were in between for all the cases. Meanwhile, the effect of D′on the efficiency was the largest, parameter α was the smallest, β and Z were between them. The repeatability of the ranking of splitter blades parameters is good, and the reliability is high. The results may establish an important base for further study on the hydraulic performance and the optimization design of a centrifugal pump with low specific speed.
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