Experimental Study on the Flow Pattern Modifying in the Fore Bay of large Urban Side Inflow Pumping Stations

The flow pattern in the fore bay and sump of large urban side inflow pumping station is worse which causes machine vibration, lower efficiency and other server problems. According to pumping station features, some engineering measures can improve effectively the intake flow patterns in the fore bay and the inlet conditions of pumps. In this paper, the reasons for the bad flow pattern are analyzed on the basis of model test of the fore bay of Wuhaogou pumping station of Qingcaosha water resource project which is the major security project of Shanghai World Expo 2010. The methods were discussed to the inlet flow patterns and the influence of the inlet flow patterns, and the measures which are multi-water distribution holes and bottom sill and guide piers were put forward to ameliorate the flow pattern in the paper. The model test results showed that the measures were valuable in ameliorating flow patterns and the inlet conditions of pumps. The engineering measures to improve the flow pattern in the fore bay are developed by the consideration of the analysis results and the features of pumping station layout.