不同雷诺数下堆芯组件内流场流动传热特性不同，其中流动阻力和最高温度的位置对研究堆芯的安全分析至关重要，为详细研究堆芯组件处在各个状态下的流动换热特性，采用FLUENT软件对169棒束快堆燃料组件进行三维数值分析，结果表明：冷却剂在层流到湍流的转捩区误差最大，所以需要更加详细的处理；随着雷诺数的增大，燃料组件的流阻变大，流阻在棒束区占比最大，稳定后占比达70%；随着贝克莱数的增大，燃料组件的换热能力增大，燃料组件棒束区内部的高温区始终集中在燃料组件的中心区域，呈现出中心温度高，边缘温度低的分布，同时温度分布与速度有相关性。

The flow and heat transfer characteristics of the fuel assembly components in the core are different at different Reynolds numbers, where the resistance to flow and the location of the highest temperature are crucial for the safety analysis of the core. In order to study the flow heat transfer characteristics of the core components in each state in detail, the FLUENT software was used to conduct a three-dimensional numerical analysis of the 169 rod-beam fast reactor fuel assembly. The results show that the error in the transition zone from laminar to turbulent flow is the largest, so more detailed treatment is needed. The flow resistance of the fuel assembly increases with the increase of Reynolds number, and the flow resistance is the largest in the rod-beam region, which is 70% larger after stabilization. With the increase of the Beckley number, the heat transfer capacity of the fuel assembly increases, and the high temperature region inside the rod bundle region of the fuel assembly is always concentrated in the center region of the fuel assembly, showing a distribution of high center temperature and low edge temperature. At the same time, the temperature distribution is correlated with the velocity.