Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Numerical investigation of the critical heat flux in a 5 × 5 rod bundle with multi-grid

  • Liu, Wei (State Key Laboratory of Reactor System Design Technology, Nuclear Power Institute of China) ;
  • Shang, Zemin (School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University) ;
  • Yang, Shihao (School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University) ;
  • Yang, Lixin (School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University) ;
  • Tian, Zihao (School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University) ;
  • Liu, Yu (State Key Laboratory of Reactor System Design Technology, Nuclear Power Institute of China) ;
  • Chen, Xi (State Key Laboratory of Reactor System Design Technology, Nuclear Power Institute of China) ;
  • Peng, Qian (State Key Laboratory of Reactor System Design Technology, Nuclear Power Institute of China)
  • Received : 2021.03.23
  • Accepted : 2021.11.15
  • Published : 2022.05.25
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Abstract

To improve the heat transfer efficiency of the reactor fuel assembly, it is necessary to accurately calculate the two-phase flow boiling characteristics and the critical heat flux (CHF) in the fuel assembly. In this paper, a Eulerian two-fluid model combined with the extended wall boiling model was used to numerically simulate the 5 × 5 fuel rod bundle with spacer grids (four sets of mixing vane grids and four sets of simple support grids without mixing vanes). We calculated and analyzed 11 experimental conditions under different pressure, inlet temperature, and mass flux. After comparing the CHF and the location of departure from the nucleate boiling obtained by the numerical simulation with the experimental results, we confirmed the reliability of computational fluid dynamic analysis for the prediction of the CHF of the rod bundle and the boiling characteristics of the two-phase flow. Subsequently, we analyzed the influence of the spacer grid and mixing vanes on the void fraction, liquid temperature, and secondary flow distribution. The research in this article provides theoretical support for the design of fuel assemblies.

Keywords

References

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