Analysis of Radial Force and Pressure Pulsations of Submersible Sewage Pump Impeller Under Different Clogging Conditions

To address the challenge of impeller clogging due to entangled impurities in submersible sewage pumps, the 200WQ400-14-30 semi-open double-blade model was numerically investigated to analyze the influence of blockage position on its performance. The results indicate that: （1） Performance degradation intensifies with blockage proximity to the outlet: Compared to normal conditions, outlet blockage increases power by 4 kW and reduces efficiency by nearly 13%. （2） Blockage causes a significant increase in the radial force on the impeller, with the mean value rising from 104 N to 322 N and fluctuations intensifying. The resultant force direction shifts from symmetry to eccentric aggregation in the fourth quadrant, consistently deviating from the blockage location. The overall blockage process exhibits enhanced low-frequency excitation dominance. This study reveals the influence mechanism of blockage position on hydraulic excitation, providing theoretical support for anti-clogging impeller design and operational stability optimization.