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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
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No.9 Gaoguannong,Daxue Road,Hangzhou,China
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310009
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meem_contribute@163.com
Abstract: During the work of slurry pump, the hard-solid particles in the slurry will cause strong erosion and wear on the pump wall, resulting in lower efficiency and shorter service life of the slurry pump. In order to solve the problems of low efficiency and fast wear rate of slurry pump, the impeller blade profile of slurry pump was modified by using the variable angle spiral method (VASM), and the influence of different particle size, concentration and density on the performance of slurry pump with different profiles was studied.Firstly, the variable angle helix method and discrete phase model were introduced, and the numerical calculation model was verified. Then, on the premise that the front and rear cover plates of impeller and the profile of blade were unchanged, the VASM was used to modify the design of the LC100/350 slurry pump blades.The pump inner two-phase flows were simulated by using Reynolds-average Navier-Stokes equation, and the RNG k-ε turbulence model, discrete phase model (DPM) and SIMPLE algorithm. To assess the improvement effect, the lead, efficiency and wear strength of the pump under rated working condition were taken as the improved performance index of the slurry pump. Finally, the relationship between the blade profile and the hydraulic performance and abrasion performance of the pump was analyzed using CFD numerical simulation. The calculation results show that the blade designed by VASM, can reduce the erosion strength, improve the efficiency obviously and have a little effect on the head.Although the increase of particle size and concentration reduce the efficiency and increase the wear strength, the change of particle size and concentration cannot affect the selection of the optimal blade shape. Considering the hydraulic performance and erosion strength of the slurry pump, the blade wrap angle of 140 ° is optimal.
Key words: centrifugal pump; variable angle spiral method(VASM); discrete phase model; impeller; wear strength; lead and efficiency of slurry pump
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