Effect of Shaft Sleeve Design on the Hydraulic and Suction Performances of Two-stage Centrifugal Pump

Multistage centrifugal pumps are designed for industrial purposes to satisfy high head requirements. The two-stage centrifugal pump is used for specific industrial purposes. The impellers in the two-stage centrifugal pump are arranged in an opposite direction, and crossover guides the flow from 1<SUP>st</SUP> stage to 2<SUP>nd</SUP> stage impellers. The numerical analysis is performed to evaluate the performance of a two-stage centrifugal pump. The shaft sleeve design is modified from an edge to a curved type for better flow behavior. The numerical analysis showed that the modified shaft sleeve shape improves the pump’s hydraulic and suction performances, as well as internal flow behavior in a wide operation range. Besides the pump performances, the modified shaft sleeve shape showed structural stability with a relatively large margin below the ultimate tensile stress.