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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
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Abstract: In order to study the internal fluid flow characteristics during the start-up of centrifugal pump, ANSYS CFX software was used based on RNG kε turbulence model, the quasi-steady-state and transient unsteady numerical simulations of a centrifugal pump with a rotational speed of 146 were carried on. Through the secondary development interface was provided by CFX software, the user-defined function CEL was written to load the speed change law during the starting process of centrifugal pump and simulate the whole speed change process of centrifugal pump. In the whole starting process of centrifugal pump, the difference between the external characteristic curves of quasi steady state calculation and transient unsteady calculation was analyzed; The internal pressure distribution of centrifugal pump and the difference of pressure pulsation of centrifugal pump at each time during startup were observed. Based on the above observations, the influence of startup process on the internal fluid flow characteristics of centrifugal pump was studied. The results show that in the initial stage of centrifugal pump start-up, both transient head and transient efficiency appear pulse phenomenon; The main frequency of pressure pulsation at the monitoring points is 0.030 3f, the maximum amplitude of pressure pulsation on the blade appears near the outlet monitoring point y5 on the working back, and the minimum amplitude appears near the inlet section monitoring point y1.
Key words: centrifugal pump;boot process;internal flow;transient characteristics;quasi-steady-state;transient unsteady state
MA Xiao-tang, SONG Wen-wu, SHU Yi-chen, et al. Transient characteristics of internal flow during the starting process of centrifugal pump［J］.Journal of Mechanical & Electrical Engineering, 2021,38(12):1546-1551.
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