Effects of diffusion guide vane on performance of tubular pump system
Feng Xusong1, Jin Yan2, Liu Chao2
(1.Jiangsu Water Source Co. Ltd. of SouthtoNorth Water Transfer Project, Nanjing, Jiangsu 210029, China; 2.College of Hydraulic Science and Engineering,Yangzhou University, Yangzhou, Jiangsu 225009, China)
Abstract：Diffusion guide vane number is a factor affecting on the hydraulic performance of tubular pump system. CFD method was used to simulate the threedimensional flow of a bulb tubular pump system with different diffusion guide vanes.Five adopting schemes were the tubular pump system with 4 guide vanes, 5 guide vanes, 7 guide vanes, 8 guide vanes and improved 5 guide vanes. The hydraulic performance of pump system and the hydraulic loss of guide vane unit were obtained, and the effect of different vane number and vane shape on the external characteristics of tubular pump system were analyzed. The results showed that the hydraulic loss of guide vane was increased with the vane number, but the efficiency of pump system did not fully comply with this law. The highest pump efficiency was of the case with 5 vanes. The distributions of pressure and velocity were more uniform and the minimum hydraulic loss and the highest efficiency were in scheme with the improved 5 vanes. The best guide vane number matching the impeller was proposed.
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