Optimal Design of Slit Impeller for Low Specific Speed Centrifugal Pump Based on Orthogonal Test

Marine centrifugal pumps are mostly used on board ship, for transferring liquid from one point to another. Based the combination of orthogonal testing and numerical simulation, this paper optimizes structure a drainage trough typical low-specific speed pump, determines priority various geometric factors pump performance, obtains optimal impeller scheme. The influence tank internal flow is also analyzed. First, based experimental validation initial model, it determined that simulation method in highly accurate predicting performance pumps. Secondly, three four levels test, test plan results This work found slit diameter width have large impact pumps, while long short vane lap lengths less impact. Finally, we compared distribution between model optimized could effectively reduce pressure difference suction side blade. By weakening large-scale vortex path reducing hydraulic losses, impellers obtained tests can significantly improve efficiency