In order to achieve the high passing capacity, high efficiency and non-overload performance of a sewage pump, the type of WQS120-60-45 sewage pump is selected as an example to be researched. The theory analyses and numerical simulation were conducted on the internal two-phase flow of the pump. The distribution of the solid particles in impeller is observed, and the influence of impeller outlet angle on pump efficiency and the ability of solid particles passing through is analyzed. The results showed that the solid particles concentrated on pressure surface of impeller. When impeller outlet angle was higher, local medium energy lost seriously. With the angle decreasing, the blade was more suitable for the flow of the solid particles, which has improved the impeller wearing and increased efficiency. This study can provide a certain reference for optimization design of sewage pump impeller.
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