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发表时间：2014-01-01

发表刊物：核动力工程

所属单位：能源与动力学院

卷号：35

期号：4

页面范围：39-42

ISSN号：0258-0926

摘要：Numerical analysis is carried out for the effects of four kinds of grid
   spacer on the resistance characteristics within sub-channels of
   supercritical reactor core with commercial CFD code using unstructured
   polygonal mesh. The results show that the pressure loss induced by the
   grid spacer includes the frictional drag and form drag. The frictional
   drag is mainly determined by the length of grid strap while the form
   drag is determined by the blockage ratio of grid spacer and the
   structure of flow enhancing feature. Due to the more streamlined
   structure, the mixing-van type grid spacer induces less pressure loss
   when it is used to enhance forced convection within sub-channel.
   Although the mixing-van type grid spacer has more complex structure in
   comparison with standard egg-crate grid spacer, it has obvious
   advantages in the area of flow enhancing and can be primarily considered
   in the optimal design of grid spacer used in supercritical water cooled
   reactor core.

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