SCWR类三角形通道超临界流动传热定位格架结构影响研究

Study on Influence of Supercritical Flow and Heat Transfer Grid Spacer Inner Structural of Supercritical Water Cooled Reactor Triangular Channel

基于带定位格架类三角形子通道超临界水流动传热试验,数值研究了棒径为8 mm,栅距比为1.4的超临界水冷堆(Supercritical Water Cooled Reactor,SCWR)类三角形通道超临界流动传热定位格架结构影响,分析了同型定位格架典型结构参数和不同定位格架型式对堆芯通道超临界流动传热特性的影响规律。研究结果表明:定位格架可强化堆芯通道超临界水传热,同型格架本体厚度越大,压力损失越高,格架处壁面温度越低,局部换热能力越好,当增大格架本体厚度,弱化程度无明显差异;阻流片型定位格架下游局部换热能力提高显著,阻流片直径越大,上游压力越大,局部壁温越低,换热系数越高,增大阻流片直径可减小传热弱化区域大小,强化传热能力;不同定位格架型式对比研究发现交错叶片型弱化区域最大,阻流片型定位格架弱化区域最小,阻流片型定位格架具有最佳的传热强化效果。

Based on the supercritical water flow heat transfer test of a triangular coneshaped core channel with a grid spacer,The numerical study on the supercritical watercooled Reactor SCWR-type triangular channel supercritical flow heat grid spacer inner structural with a rod diameter of 8 mm and a pitch ratio of 1.4.The influence of the typical structural parameters of the same-type grid and the different grid space patterns on the supercritical flow heat transfer-characteristics of the core channel are studied.The results show that the grid space can enhance the supercritical water heat transfer of the core channel.The larger the thickness of the same type grid body,the higher the pressure loss,the lower the wall temperature at the grid,the better the local heat transfer capacity.When the thickness of the grid body is increased,there is no significant difference in the degree of weakening.The local heat transfer capacity of the choke-type grid spacer is improved,the larger the diameter of the baffle,the larger the upstream pressure,the lower the local wall temperature,the higher the heat transfer coefficient,and the larger the diameter of the baffle can reduce the heat transfer,weaken the size of the area and enhance heat transfer capacity.The comparison of different grid space types shows that the stray blade type weakening area is the largest,the choke-type grid spacer weakening area is the smallest,and the choke-type grid space has the best heat transfer enhancement.