Abstract:The pump cavitation performance will be influenced by the additional splitter blades because the shape of the impeller inlet channel is changed. In order to investigate the influences, four impeller schemes were presented based on a model pump IS50-32-160, one without splitter blades and another three with splitter blades of different inlet diameters. By using the CFD technique, numerical simulations were carried out to investigate the characteristics of internal flow and the pump cavitation performances at different NPSHA. The results show that the cavitation performance of pump is improved by the additional splitter blades, and that the proper selection of the inlet diameter of splitter blades contribute to the degree of improvements of the cavitation performance of pump, which even could avoid the blocking at the impeller inlet and vortex cavitation inside the water passage effectively, and that the cavitation performance reaches its best when the inlet diameter of splitter blades is 0.725D2 for the pump model under our investigation.
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