Influence of obstacle placement on cavitation performance of centrifugal pump
DAI Cui1, WANG Zhaoxue1, DONG Liang2*, QIU Junfeng1,CHEN Yiping1
1. School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China
Abstract：In order to study the influence of the position of the obstacles on the cavitation performance of the centrifugal pump, the hemispherical obstacles were arranged at different positions of the working surface and the back surface of the blades. By using the Zwart cavitation model and the SST k-ω turbulence model, the centrifugal pump model with obstacles in different positions was simulated, and the inhibition effect of obstacles in different positions on the cavitation of the centrifugal pump was investigated. The results show that the cavitation performance of the centrifugal pump is improved most obviously when the obstacles are placed at the inlet 1/3 of the vane working face. When a hemisphe-rical obstacle is placed at the 1/3 position of the blade working face, the lift of the centrifugal pump increases by 1.14%, and the drop point of the lift by 3% is later than that of the original pump. When the cavitation number is 0.166, the cavitation volume fraction of the impeller decreases by 69.7% compared with that of the original pump. It can reduce the low-pressure area at the inlet of the impeller and make the cavitation at the inlet of the impeller less easy.
