Influence of volute tilted outlet on performance of mixed-flow pump as turbine
YANG Sunsheng1*, DAI Tao1, CHEN Zhen2, SHAO Ke1, WANG Kai1
1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Grundfos Pumps(Shanghai)Co. Ltd., Shanghai 201106, China
Abstract：Two volutes of a mixed-flow pump with specific speed of 288 were designed respectively with horizontal and tilted inlets to reveal their influence on the performance and improve the efficiency when working as turbine, i.e. pump as turbine(PAT).In the design, the volute inlet(outlet for PAT)orientation was rotated 26° clockwise while the rest geometrical parameters remained unchanged. In this study, experimental and numerical simulation methods have been adopted.After the volute inlet is til-ted, the streamlines in the impeller is more evenly distributed, and the secondary flow and vortex phenomena are significantly suppressed compared with the volute with horizontal inlet.Under the design flow condition(Q=120 m3/h), compared with the PAT with horizontal outlet(inlet for pump), the shaft power, head and efficiency of the PAT with tilted outletare increase by 17.64%, 10.41% and 5.2%, respectively.After the volute outlet is tilted in the PAT, the hydraulic loss in both the impeller and the draft tube is reduced, even though the loss in the volute rises slightly,the total hydraulic loss is declined. The experimental results are consistent with the data of numerical simulation, leading to a validated accuracy of numerical simulation.This study can enrich design methods of PAT and can providea reference for hydraulic design of mixed-flow pump used as PAT.
杨孙圣*,戴韬,陈振,邵珂,王凯. 蜗壳出口倾斜对混流泵作透平的性能影响[J]. 排灌机械工程学报, 2020, 38(5): 451-456.
YANG Sunsheng*,DAI Tao,CHEN Zhen,SHAO Ke,WANG Kai. Influence of volute tilted outlet on performance of mixed-flow pump as turbine. Journal of Drainage and Irrigation Machinery Engin, 2020, 38(5): 451-456.
