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Journal of Drainage and Irrigation Machinery Engin  2016, Vol. 34 Issue (5): 392-398    DOI: 10.3969/j.issn.1674-8530.15.0149
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Matching characteristic between impeller and bowl diffuser in multi-stage centrifugal pump
WANG Kai1, WANG Wenbo2, LIU Houlin1, XIA Chen1
1.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.School of Energy and Power Engineering, Xi′an Jiaotong University, Xi′an, Shaanxi 710049, China
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Abstract The flow field in a three-stage centrifugal pump was simulated by using CFX software based on the standard k-ε turbulence model, the predicted performance curves were compared with the measurements, and good agreement was showed. After a further analysis on the flow details, however, a larger hydraulic loss has occurred in the gap between the impeller and the bowl diffuser as well as in the diffuser itself. In order to reduce the hydraulic loss and improve the matching characteristic of the diffuser to the impeller, four diffusers with different inlet structures are designed. The steady flow in the three-stage pumps with these diffusers is simulated at the design point, and the pump performance, flow pattern and the pressure distribution over the diffuser vane pressure side are analysed. The results show that the diffuser with untwisted inlet and in parallel with the impeller outlet has the best hydraulic performance. The diffuser with twisted inlet results in an increased impeller head, but the hydraulic loss in the gap between the impeller and the diffuser rises, and the pressure at the inlet of diffuser becomes instable. The diffuser with inlet edge in parallel with the impeller outlet can reduce the inside loss to improve the hydraulic performance. Even though the diffuser with inlet edge in parallel with the pump shaft can compromise the interference with the impeller to increase the impeller hydraulic performance, the hydraulic loss in the gap is increased.
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WANG Kai-
WANG Wen-Bo-
LIU Hou-Lin-
XIA Chen-
Key wordsmulti-stage centrifugal pump   impeller   bowl diffuser   inlet structure   matching characteristics     
Received: 2015-07-01;
Cite this article:   
WANG Kai-,WANG Wen-Bo-,LIU Hou-Lin- et al. Matching characteristic between impeller and bowl diffuser in multi-stage centrifugal pump[J]. Journal of Drainage and Irrigation Machinery Engin, 2016, 34(5): 392-398.
 
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