Influence of blade inlet edge position on performance of single-blade centrifugal pump
CHEN Jianfang 1,2, SHI Weidong1,3*, ZHANG Desheng1
1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. School of Petroleum Engineering, Changzhou University, Changzhou, Jiangsu 213164, China; 3. School of Mechanical Engineering, Nantong University, Nantong, Jiangsu 226019, China
Abstract：In order to study the influence of blade inlet edge position on the performance and internal flow characteristics of single blade centrifugal pump, six impellers with different blade inlet position were designed. The numerical calculation results were verified with the experimental results, and the steady numerical calculation of the whole flow field of the pump with six kinds of impellers was carried out. The calculation results show that the proper extension of the shroud or hub along the blade inlet edge to the pump inlet can enhance the fluid control ability and work ability of the blade. The maximum head increases by 1.61 m and 0.70 m respectively, and the maximum efficiency increases by 5.23% and 2.01% respectively. If the blade inlet edge extends too much to the pump inlet, the fluid at the blade inlet will be blocked, and the pump head and efficiency will be reduced under some working conditions. The blade inlet edge extends to the pump inlet, which can reduce the energy loss of fluid at the blade inlet. It can also increase the pressure at the inlet of the blade suction surface and reduce the low-speed area in the volute. However, it will increase the low-speed area at the blade inlet, the front end of blade pressure and near the blade suction surface. Compared with the extension of the blade inlet edge along the hub to the pump inlet, the extension of the blade inlet edge along the shroud to the pump inlet has a more obvious impact on the pump head and efficiency.
