Ansys-CFX software was adopted to simulate the unsteady flow field at different operating conditions in an entire centrifugal pump whose impeller was designed with and without splitter blades. To analyze the influence of design parameters of splitter blades on the unsteady flow field of the pump, the splitter blades were designed to have different inlet diameters and circumferential positions. The results show that when splitter blades are added, the pump head increases by 2%-12% and the pressure fluctuations at the impeller inlet, volute outlet and the interface of impeller and volute are reduced, thus the splitter blades have improved the “jetwake” flow structure. The influence of design parameters of splitter blades on the unsteady flow field in the pump is variable. When the inlet diameter of splitter blades is 106 mm and the blades are deviated to the suction side of the full length blades by 5° , the head is the highest and the pressure fluctuations are the lowest.
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