CEFR堆顶固定屏蔽冷却系统流动特性数值研究

摘要

堆顶固定屏蔽在中国实验快堆（CEFR）中承担着重要功能，对其进行充分冷却极其重要。本文采用C FD方法对该设备的冷却系统进行了三维数值研究，详细分析了该冷却系统的流动特性和水力学设计，并对设计中的不足提出了优化建议。研究表明，该冷却系统基本可满足要求，但部分环节需要优化。将调节阀尽量均匀布置可改善水平风道流场分布；入口处设置两道通风孔可提高竖直风道内空气流动的均匀性；调节阀开度应适当增加以进一步满足流量分配需求。该研究可为CEFR运行安全和类似冷却系统的设计提供参考。%T he fixed shielding platform plays important function in China Experimental Fast Reactor (CEFR) ,and it’s extremely important to sufficiently cool it .In this paper ,CFD method was used to perform three‐dimensional numerical research on the cooling system for fixed shielding platform .Flow characteristic and hydraulic design of the cooling system were analyzed detailedly .The optimization suggestions were put for‐ward on the defects in the design .The results show that the cooling system can basical‐ly meet the requirements ,but some parts need to be optimized .Flow field distribution in horizontal channels will be improved with more uniformly distributed regulating valves .The uniformity of airflow in vertical channels can be improved with two sets of throttles at inlets .The openness of regulating valves should be properly increased to further meet the requirements of flow distribution .This work can provide reference for operation safety of CEFR and design of similar cooling systems in the future .