Influence of impeller diameter on mixed flow pump as turbine
BAI Yuxing1,2*,LIU Yingying3,KONG Fanyu2,XIA Bin2,DAI Tao2
1. School of Automotive & Rail Transit, Nanjing Institute of Technology, Nanjing, Jiangsu 211167, China; 2. National Research Center of Pump, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 3. Chengdu Power Machinery Works, Chengdu, Sichuan 610000, China
In order to research the performance and concentration of the impeller diameter of mixed flow pump as turbine, a mixed flow pump was set as a model. First, the CFD method was verified by using the experiment. Then, three different impeller diameters of 160,170 and 180 mm were built through BladeGen. Finally, the numerical simulation is used to make an analysis of hydraulic characteristics, loss distribution and internal flow field distribution under these three different impeller diameters. The results show that with the increase of impeller diameter, the high efficiency point moves gradually to the large flow area, and the corresponding head, shaft power and efficiency of the high efficiency point increase. In the large flow area, the head decreases rapidly, the shaft power decreases and the efficiency increases, while the total hydraulic loss and the hydraulic loss of the impeller part decrease significantly; the hydraulic loss change in the volute part is not obvious; the vortex area of the impeller inlet gradually decreases; the gap fluid between the volute and impeller entrance gradually decrease, which causes the hydraulic loss in the part decreases gradually.
YANG Junhu, YUAN Yafei, JIANG Yunguo, et al.Performance predictions of reversed centrifugal pumps wor-king as energy recovery turbines[J]. Journal of Lanzhou University of Technology, 2010,1(36): 54-56.(in Chinese)