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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
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86-571-87239571
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No.9 Gaoguannong,Daxue Road,Hangzhou,China
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meem_contribute@163.com
Abstract: In order to improve the calculation accuracy of reactor coolant pump in numerical simulation process, the reasonable range of time step under unsteady calculation was studied. Firstly, the full computational domain model was divided into hexahedral structured grids. Based on DDES turbulence model, the time required for each rotation of the impeller Δα=1°, 1.5°, 2° and 3° was set as time step, and the unsteady numerical simulation was carried out. Then, the calculation results were analyzed from two aspects: the calculation accuracy of hydraulic performance and the pulsation characteristics of hydraulic performance. Finally, the distribution characteristics of the vortex field in the pump were analyzed, and the analytical accuracy of the time step on the complex flow characteristics in the reactor coolant pump was discussed. The results show that the smaller the time step is, the higher the response frequency is, which can feedback the influence of turbulence pulsation on the flow field at higher frequency. When the time step is Δα=2°, the average calculation error of each hydraulic performance is 0.33%, which is 0.43% less than Δα=3°, and only 0.08% higher than Δα=1°. On the whole, taking the time required for the impeller to rotate Δα=2° as the time step can not only obtain higher unsteady calculation accuracy, but also save the calculation time.
Key words: centrifugal pump; numerical simulation accuracy; full computational domain model; calculation accuracy of hydraulic performance; pulsation characteristics; prediction accuracy; turbulent pulsation frequency
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