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International Standard Serial Number:
ISSN 1001-4551
Sponsor:
Zhejiang University;
Zhejiang Machinery and Electrical Group
Edited by:
Editorial of Journal of Mechanical & Electrical Engineering
Chief Editor:
ZHAO Qun
Vice Chief Editor:
TANG ren-zhong,
LUO Xiang-yang
Tel:
86-571-87041360,87239525
Fax:
86-571-87239571
Add:
No.9 Gaoguannong,Daxue Road,Hangzhou,China
P.C:
310009
E-mail:
meem_contribute@163.com
Abstract: In the actual operation environment of centrifugal pump, the sand particles in solidliquid twophase flow can directly affect the efficiency and stability of mechanical operation. Therefore taking a centrifugal pump with a specific speed ns=157 as an example, the motion characteristics of different particle sizes of sand in the pump were simulated and analyzed. Firstly, CFturbo and UG software were used for 3D modeling and optimization of the centrifugal pump, and ICEM software was used to divide the model into the whole basin grid to meet the calculation accuracy requirements. Then, ANSYS commercial software was used for precalculation processing. Combining with Mixture multiphase flow model and Finnie wear model, five different particle sizes of sand were designed and the full channel simulation was carried out. Finally, according to the simulation results, the motion distribution and wear of different particle sizes of sand in the pump channel and the transient effects on the pump were analyzed. The research results show that in the range of particle size 0.04 mm~0.2 mm, the pump head decreases by about 1.3% and the efficiency decreases by 0.6%~1.5% when the sand particle diameter increases by 0.04 mm. The sand particles mainly gather in the outer trailing edge of the suction surface of the blade, the front cover plate of the pump and the tongue of the volute. The concentration of the sand particles is positively proportional to the particle size. When the sand particle size increases by one gradient, its distribution area on the suction surface can increase by about 5%, and the maximum area of the blade can be about 35%. Due to structural differences, the low diameter sand particles in the volute flow path are more likely to suspend and accumulate in the flow path, while the large diameter sand particles in the impeller flow path accumulate due to friction. When the particle size is 0.08 mm, the pressure pulsation amplitude and radial force growth rate caused by small diameter sand are smaller than that of large diameter sand.
Key words: centrifugal pump; solidliquid twophase flow; distribution of sand movement; wear condition; motion characteristic; Mixture multiphase flow model; Finnie wear model
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- Chinese Core Periodicals
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- Chinese Sci-tech Core Periodicals
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- SA, INSPEC Indexed
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- CSA: T Indexed
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- UPD:Indexed
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2010 Zhejiang Information Institute of Mechinery Industry
Technical Support：Hangzhou Bory science and technology
