CAVITATING SUPPRESSION OF LOW SPECIFIC SPEED CENTRIFUGAL PUMP WITH GAP DRAINAGE BLADES  

作　　者：ZHU Bing CHEN Hong-xun 

机构地区：[1]Shanghai Institute of Applied Mathematics and Mechanics and Shanghai Key Laboratory of Mechanics in Energy Engineering,Shanghai University,Shanghai 200072,China

出　　处：《Journal of Hydrodynamics》2012年第5期729-736,共8页水动力学研究与进展B辑（英文版）

基　　金：supported by the National Science and Technology Foundation of China(Grant No.51179100);the Key Research Projects of Shanghai Science and Technology Commission(Grant No.10100500200);the Shanghai Program for Innovative Research Team in Universities;supported by the Graduate Student Innovation Foundation of Shanghai University(Grant No.SHUCX111010)

摘　　要：This paper aims to clarify the cavitation suppression mechanism of the gap structure impeller based on the analysis of cavitation characteristics in a low specific speed centrifugal pump. In order to obtain reliable and consistent numerical results, some numerical considerations and modeling methodology were demonstrated and researched, and a check of the time and space resolution were also conducted. Hence the predicted cavitation performance of the two centrifugal pumps were investigated and compared with experimental results, and they were in qualitative agreement. It was confirmed that the new gap structure impeller has a very good characteristic of inhibiting cavitation, especially in large flow area, the present numerical method can effectively capture the major internal flow features in the centrifugal pump, through the comparison of the two type impeller flow fields, the cavitation suppression mechanism of the gap impeller may be the combination effects of the small vice blade＇s guiding flow and gap tunnel＇s auto-balancing of pressure.This paper aims to clarify the cavitation suppression mechanism of the gap structure impeller based on the analysis of cavitation characteristics in a low specific speed centrifugal pump. In order to obtain reliable and consistent numerical results, some numerical considerations and modeling methodology were demonstrated and researched, and a check of the time and space resolution were also conducted. Hence the predicted cavitation performance of the two centrifugal pumps were investigated and compared with experimental results, and they were in qualitative agreement. It was confirmed that the new gap structure impeller has a very good characteristic of inhibiting cavitation, especially in large flow area, the present numerical method can effectively capture the major internal flow features in the centrifugal pump, through the comparison of the two type impeller flow fields, the cavitation suppression mechanism of the gap impeller may be the combination effects of the small vice blade＇s guiding flow and gap tunnel＇s auto-balancing of pressure.

关 键 词：Low Specific Speed Centrifugal Pump （LSSCP） gap drainage blade cavitation suppression numerical simulation 

分 类 号：TH311[机械工程—机械制造及自动化] TK223.25[动力工程及工程热物理—动力机械及工程]