Abstract:

A verification of the SST turbulence model was conducted according to the flow distribution experiment for WCSB blanket module by JAEA. The simulation model of the first wall in the WCSB blanket module was established to simulate the flow distribution in each cooling tube of the first wall. Calculation result shows that the flow behavior in the first wall model is complicated, and the whole coolant flow area can be classified into main flow and reverse flow area. Respectively, the main flow effects the flow distribution in the cooling tubes mostly, and a series of secondary vortex and toroidal flow exists in the reverse flow. The analysis result shows that the uneven phenomenon of the flow distribution exists in the cooling channels and the difference of the flow rate is less than 2% in the first wall model under all conditions.

Key words: WCSB blanket module, First wall, Flow distribution, Numerical simulation

摘要：

用JAEA 水冷包层(WCSB)模块侧壁的流量分配实验验证了SST 湍流模型，建立了水冷包层模块第一壁的数值分析模型，研究了第一壁各冷却管中的流量分配情况。分析结果发现，第一壁模型入口集管中存在复杂的流动行为，冷却剂可以明显的区分为主流和逆流两大部分，其中主流进入冷却管的位置是影响流量分配的主要因素，逆流区形成了一系列次级涡流和沿管壁的环向流动。分析结果表明，在第一壁模型中，在所以条件下，各冷却剂通道中存在流量分配不均匀现象，流速最大值与最小值偏差均小于2%。

关键词: 水冷包层模块, 第一壁, 流量分配, 数值模拟