Influences of volute cross-section area profile on performance of low-specific-speed centrifugal pump
1.School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Jiangsu Zhenhua Pump Industry Co. Ltd., Taizhou, Jiangsu 225500, China
Abstract：In order to investigate effects of volute cross-section area profile on performance and pressure pulsation of centrifugal pump, a single stage centrifugal pump with a volute respectively in four different cross-section area profiles(convex up, linear, concave down and S-shaped)is involved in the present study. Unsteady turbulent flow field in the pump is simulated and analyzed. Results show that the area profile has a slight influence on the hydraulic performance at design point, the pump head and efficiency are changed by less than 1.4% and 0.4%, respectively, in comparison with the reference case-linear profile. However, at off-design points, the head and efficiency change considerably from one profile to another. Further, velocity distribution in the cross-section largely depends on cross-section area profile. The velocity field in the volute with linear, concave down and S-shaped area profiles is more uniform than that in the volute with convex up area profile. At design point, the volute with convex up and S-shaped area profiles can reduce pressure pulsation level obviously, in particular, the volute with S-shaped area profile results in the lowest pulsation level and is the best configuration. Furthermore, the volute with concave down area profile can intensify pressure pulsation amplitude. The static pressure around the impeller can be altered by volute cross-section area profile, as a result, the magnitude of radial thrust is changed. The average radial thrust on the impeller is the minimum for the linear area profile, but it is the maximum for the convex up area profile. The results can be significant for configuration optimization of volute in a centrifugal pump.
高波1, 杜文强1, 杨丽1, 张宁1, 王浩宇1, 袁霄2. 蜗壳面积变化规律对低比转数离心泵性能的影响[J]. 排灌机械工程学报, 2017, 35(9): 749-.
GAO Bo-1, DU Wen-Qiang-1, YANG Li-1, ZHANG Ning-1, WANG Hao-Yu-1, YUAN Xiao-2. Influences of volute cross-section area profile on performance of low-specific-speed centrifugal pump. Journal of Drainage and Irrigation Machinery Engin, 2017, 35(9): 749-.
