排灌机械工程学报
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Journal of Drainage and Irrigation Machinery Engin  2012, Vol. 30 Issue (3): 289-294    DOI: 10.3969/j.issn.1674-8530.2012.03.009
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Variable pitch profile equation of screw centrifugal pump

(School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China)
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Abstract According to the structure characteristics of impeller of a screw centrifugal pump, the streamwise evolutionary pattern of blade pitch was analyzed by applying the theory of relative velocity ratio of liquidsolid twophase flow model for an impeller pump, and then a parametric equation for variablepitch was deduced. For the given hydraulic performance parameters and a volume fraction of the solid phase at the design point, a smooth, threedimensional blade profile could be established through the parametric equations.The water performance of a screw centrifugal pump whose blades were designed in that way was measured, and accordingly its performances of liquidsolid twophase flow were estimated numerically at three volume fractions of 5%, 15% and 25% with a CFD code, respectively. The results show that the pump efficiency for transporting solidliquid twophase medium is better than for transporting water. At the design point, for a given volume fraction of solid phase, the pump efficiency is increased by 8.5%; however, when the volume fraction is different from that given value, the pump efficiency is reduced.Compared with water single phase flow, the pump head of liquidsolid twophase flow is not only decreased, and but also lowered gradually with increasing solidphase concentration.
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Articles by authors
CHENG Xiao-Rui
LI Ren-Nian
LI Yi-Bin
FAN Ying
SHEN Li-Xin
Key wordsscrew centrifugal pump   liquid solid two phase flow   blade profile equation   variablepitch   numerical simulation     
Received: 2011-10-06; Published: 2012-04-10
Cite this article:   
CHENG Xiao-Rui,LI Ren-Nian,LI Yi-Bin et al. Variable pitch profile equation of screw centrifugal pump[J]. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(3): 289-294.
 
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