摘要: 燃料组件内冷却剂的横流对反应堆堆芯的换热有很大影响，为研究铅基反应堆燃料组件内冷却剂的横向速度分布，对CiADS反应堆燃料组件组件局部的7，19棒束的单螺距及多螺距多种几何进行建模和CFD（Computational Fluid Dynamics）模拟，并对其间隙内横向速度进行分析。研究表明： 19棒束组件内通道、角通道的相邻间隙内横向速度的分布在组件轴向和横向上有明显周期性，横向上根据两个内通道间隙平移旋转的位置关系由一个间隙的结果经过平移一定相位角度可以得到另一个间隙分布结果，沿轴向多螺距模型每个螺距长度内横向速度分布一致。7棒束组件在相同类型通道内横向速度分布大小及趋势与19棒束一致。少棒束单螺距组件结果进行横向及轴向的周期性延拓可以得到多棒束多螺距模型间隙内的横流分布。


Cross flow of a coolant in fuel assembly had a great impact on the heat transfer of a reactor core. In order to study the characteristics of the cross flow in lead-based fast reactor assemblies, the CiADS fuel assemblies were used as research object. Fine geometric models and CFD simulation of 7 and 19 pin bundle and multi-pitch length assemblies based on CiADS fuel assemblies were carried out. The distribution of the cross flow velocity in several geometric models was compared and analyzed. The results show that the distribution of the cross flow velocity in gaps of interior and corner channel in 19 pin bundle has obvious periodicity in both axial and horizontal direction. In the horizontal direction, the results of one gap can be translated by a certain phase angle to obtain another gap distribution result according to the positional relationship of the translational rotations of the two internal channel gaps. The distribution of cross flow velocity is uniform in each pitch length of multi-pitch model in the axial direction. And the distribution of transverse flow in gaps of 7 pin bundle is similar to the distribution in the same kind of gaps in 19 pin bundle. The results of fewer pin bundle with single pitch length can be periodically extended in axial and transverse direction to obtain the characteristics of cross flow in geometric models with multi-pitch length and more rods.