Influence of splitter blade on pressure pulsation of high-speed well pump
WU Guoqiao1, ZHANG Jingchao2, JIANG Xiaoping1,3*, WANG Li1, WANG Xinwei1
1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Nanjing Research Institute for Agricultural Mechanization of the Ministry of Agriculture and Rural Affairs, Nanjing, Jiangsu 210014, China; 3. National Engineering and Technology Center for Information Agriculture, Nanjing, Jiangsu 210095, China
Abstract：Aiming at the stability problem of high-speed well pump by using splitter blade design, three-dimensional models of key parts such as impeller and guide vane were established by using Creo3.0 software. Based on the good agreement between the CFX numerical simulation data and the hydraulic characteristic experimental data, the ratio of the inlet diameter of the splitter blade d1 to the outer diameter of the impeller D2 was defined as a dimensionless coefficient σ which expressed the comprehensive characteristic parameters of the splitter blade. Three impeller schemes with different lengths of splitter blades were designed and the value σ was selected 0.60, 0.62 and 0.65 respectively. The detailed numerical simulation and analysis of pressure pulsation for the dynamic and static interfe-rence regions of each scheme were carried out. The results show that the amplitude of pressure pulsation is related to the radial distance between the monitoring points and the interface, and the larger the radial distance, the smaller the amplitude of pressure pulsation. The pressure pulsation of each monitoring point decreases with the decrease of the length of splitter blade. When the length of splitter blade is reduced to a critical value, the pressure pulsation is basically unchanged. When σ=0.62, the pressure pulsation amplitude is small, and pulsation cycle is clear. Except for the monitoring point on the middle streamline, the main frequency of pressure pulsation of each monitoring point is greatly influenced by impeller blade frequency. The splitter blade has great influence on the pressure pulsation of monitoring point on the middle streamline.