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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: The spherical pump is a new type of structural pump in electromechanical products, and the cavitation phenomenon is still an important factor affecting the performance of the pump. A study was conducted on the cavitation characteristics and performance of a spherical pump under variable rotational speed to address the cavitation problem caused by rotational speed during operation. Firstly, the computational fluid dynamics (CFD) method and dynamic grid technology were used to simulate the internal flow field of a spherical water pump. Then, based on the simulation results, the influence of rotational speed on the cavitation process in the working chamber was analyzed, and the variation law of volumetric efficiency was obtained. Finally, based on the simulation results, the suction port was improved. The research results indicate that the spatio temporal phenomenon of spherical pumps mainly occurs during the suction stage. The small suction port area in the early and late stages of suction causes a rapid decrease in liquid pressure in the working chamber, and significant cavitation occurs near the suction port and in the central area of the working chamber. At high rotational speeds, the larger change rate of the working chamber volume leads to increased cavitation, and the volumetric efficiency first increases and then decreases. When the rotational speed is between 500 r/min and 3 000 r/min, the volume fraction of cavitation in the cavity at the end of the suction stage is 1.01%~8.08%, and the volumetric efficiency of the spherical pump is 91.16%~85.51%. After improving the suction port, inlet channel effective working area increased, and the volumetric efficiency increased from 85.51% to 90.15%. The research can provide reference for the optimization design of new spherical pumps.
Key words: positive displacement pump; spherical pump; cavitation phenomenon; numerical simulation; variable speed condition; volume efficiency; computational fluid dynamics(CFD)
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