Journal of South China University of Technology (Natural Science Edition) ›› 2014, Vol. 42 ›› Issue (12): 104-111.doi: 10.3969/j.issn.1000-565X.2014.12.016

• Power & Electrical Engineering • Previous Articles     Next Articles

Analysis of 3D Flow Field in Unabridged 5 ×5 Spacer Grid and Rod Bundle Channel

Zhang Xiao-ying1 Sun Qing-you1 Qiao Lei1 Lu Dong-hua2 Wen Qing-long2   

  1. 1.School of Electric Power,South China University of Technology,Guangzhou 510640,Guangdong,China;2.China Nuclear Power Technology Research Institute,Shenzhen 518026,Guangdong,China
  • Received:2014-03-28 Revised:2014-08-27 Online:2014-12-25 Published:2014-11-17
  • Contact: 卢冬华(1969-)，男，博士，研究员，主要从事反应堆热工水力研究． E-mail:ludonghua@cgnpc.com.cn
  • About author:张小英(1973-)，女，教授，博士生导师，主要从事核反应堆热工安全理论与计算研究．E-mail:zxy1119@scut．edu．cn
  • Supported by:

    国家自然科学基金资助项目(51176052，51376065);广东省科技攻关项目(2013B010405004)

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Abstract:

The flow characteristics of spacer grid and rod bundle channels play an important role in the frame designof fuel assembly.In this paper,one unabridged spacer grid of a 5 ×5 fuel assembly is investigated.Its 3D geometryand unstructured grids are established,and a CFD code is adopted to simulate the flow characteristics of rod bundlechannels and the heat transfer characteristics of the fuel rod.Then,the effects of mixing vane,dimple,spring andband on the flow field of the fuel assembly are analyzed.The results show that (1) the spacer grid can significantlyenhance the flowing mixture and the heat transfer in the fuel assembly; (2) the mixing vane has the most signifi-cant effect on the flow field,and the downstream lateral flow of the mixing vane forms along the vane stretch direc-tion with a lateral flow length of more than 9 times greater than the grid length; and (3) the dimple and the stringcause the lateral flow to form only near their location; specifically,the lateral flow of the dimple extends from theband to the dimple front,the lateral flow of the single spring runs along its bending direction,and as for the dualspring,there exists a weak lateral flow in its joint part with the band.

Key words: fuel assembly, unabridged spacer grid, flow, heat transfer, lateral flow, CFD