交错叶片型定位格架对SCWR堆芯子通道流动及换热影响分析

The Effect of Split Vans on Flow and Heat Transfer in Sub-channel of SCWR Core

中文关键词: 堆芯子通道  交错叶片  壁温  二次流

英文关键词: sub-channel of reactor core  split vanes  wall temperature  second flow interference factor

中文摘要:

      数值模拟已经成为研究超临界水冷堆堆芯热工水力特性的重要工具。本文用Ansys CFX模拟超临界水冷堆堆芯带交错叶片型定位格架子通道与无格架子通道的流动及换热。结果表明，堆芯子通道的流动及换热都存在周向不均性。交错叶片的导流作用在子通道内产生低压区形成涡。产生较强的二次流，增强子通道内部及不同子通道之间流体的混合，进而明显增强换热。

英文摘要:

      Numerical simulation has become an important tool to study the thermal and hydraulic characteristics of Supercritical Water Reactor (SCWR). In this paper, ANSYS ICEM was employed for simulating flow and heat transfer of sub-channel with and without grid spacer. The numerical results show that, there is obviously circumferential heterogeneities of the flow and heat transfer in the sub-channels. The diversion of split-vans attached to the end of grid spacers in the sub-channels is to produce low region and vortex. The secondary flow at the cross section of downstream of split-vanes contributes to the mixing of the fluid between the inside and the different sub-channels，and then significantly enhance heat transfer.