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Indexed by:期刊论文

Date of Publication:2022-06-30

Journal:核动力工程

Affiliation of Author(s):能源与动力学院

Volume:35

Issue:3

Page Number:22-25

ISSN No.:0258-0926

Abstract:Numerical analysis is carried out for the effects of grid spacer on the
   forced convection of supercritical water in the sub-channels in
   supercritical reactor core with commercial CFD code using unstructured
   polygonal mesh. The results show that the grid spacer has great effects
   on the heat transfer characteristics of supercritical water within
   sub-channel. The grid spacer with flow-blockage disc can neutralize the
   aggravated flow chocking effect by blocking and guiding the flow around
   the sub-channel center and enhance the local heat transfer near the
   narrow gap region. Obvious swirling flow is created downstream of the
   grid spacer with split-vans and the heat and mass transfer between
   adjacent sub-channels is thus enhanced. The swirling flow can also
   induce velocity deficits and adversely affect the local heat transfer
   inside a sub-channel. The Re number has obvious effects on the local
   heat transfer downstream of the grid spacer with split-vans, and the
   improved heat transfer performance downstream of the grid spacer with
   split vanes is more pronounced for the higher Reynolds number case.

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