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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
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310009
E-mail:
meem_contribute@163.com
Abstract: In order to improve the hydraulic performance of centrifugal pump, the influence of BMS blades on the performance of centrifugal pump, as well as its drag reduction rate, internal pressure, velocity and wall shear force under different flow rates were analyzed. The mechanism of hydraulic performance of non-smooth surface blade lift pump was studied. Firstly, referring to the surface characteristics of the crab's upper shell, the bionic microsphere structure was constructed on the centrifugal pump blade. Then, based on CFX, the RNG k-ε turbulence model was used for numerical simulation, and the head and hydraulic efficiency of the smooth surface blade and the bionic microsphere surface blade at different flow rates were compared, and the relationship between the increase rate of hydraulic efficiency and drag reduction rate on the bionic microsphere surface blade was explored. Finally, the influences of the microsphere surface on the fluid pressure, velocity and the wall shear force on the blade at different flow rates were analyzed. The results show that the maximum lift rate of centrifugal pump head is 2.5% by using biomimetic microsphere structure, and the hydraulic efficiency is the best at 0.6 times rated flow, and the hydraulic efficiency decreases slightly at 0.8~1.4 times rated flow. The increase rate of hydraulic efficiency is consistent with the change trend of drag reduction rate. The microsphere structure improves the rotating stall and destroys the vortex structure of the fluid. At the same time, the microsphere structure makes the fluid pressure distribution more uniform and the blade wall shear force lower.
Key words: bionic microsphere surface(BMS); BMS blades; head of centrifugal pump; hydraulic efficiency; drag reduction rate; wall shear force
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