基于CFD的铅铋快堆上腔室降阶热分层模型开发  

Development of Reduced-Order Thermal Stratification Model for Upper Plenum of Lead-Bismuth Fast Reactor Based on CFD

作　　者：杨涛[1,2] 赵鹏程[1,2] 赵亚楠[1,2] 于涛 Yang Tao;Zhao Pengcheng;Zhao Yanan;Yu Tao(School of Nuclear Science and Technology,University of South China,Hengyang,Hunan,421001,China;Hunan Engineering and Technology Research Center for Virtual Nuclear Reactor,University of South China,Hengyang,Hunan,421001,China)

机构地区：[1]南华大学核科学技术学院,湖南衡阳421001 [2]南华大学湖南省数字化反应堆工程技术研究中心,湖南衡阳421001

出　　处：《核动力工程》2023年第2期48-53,共6页Nuclear Power Engineering

基　　金：国家自然科学基金项目(11905101);湖南省研究生科研创新项目(CX20220992)。

摘　　要：在铅铋快堆紧急停堆后,上腔室发生热分层现象对堆内结构完整性和自然循环余热排出能力产生重要影响,需要重点关注。为克服传统热分层分析方法的缺陷,基于计算流体动力学(CFD)程序Fluent得到高精度的全阶快照,通过特征正交基分解(POD)与Galerkin投影结合的方法构建降阶热分层模型。通过与CFD全阶热分层模型对热分层现象进行对比分析,研究结果表明所开发的降阶热分层模型能很好地模拟上腔室温度分布,能快速地开展铅铋快堆事故下的热分层界面特性研究。本文研究对热分层现象产生机理、有效遏制热分层现象产生提供了重要分析工具。After the emergency shutdown of the lead-bismuth fast reactor,the thermal stratification in the upper plenum has an important impact on the integrity of the reactor structure and the residual heat removal capacity of the natural circulation,which requires special attention.In order to overcome the defects of traditional thermal stratification analysis method,a high-precision full-order snapshot is obtained based on computational fluid dynamics(CFD)code,and a reducedorder thermal stratification model is built by combining proper orthogonal decomposition(POD)with Galerkin projection.After conducting a comparative analysis of thermal stratification with the full-order model of CFD,the results show that the reduced-order thermal stratification model developed can effectively simulate the temperature distribution in the upper plenum and carry out a quick research on the thermal stratification interface characteristics in case of the lead-bismuth fast reactor accident.The research in this paper provides an important analytical tool for studying the thermal stratification mechanism and effectively curbing the thermal stratification.

关 键 词：铅铋快堆上腔室 热分层 计算流体动力学(CFD) 特征正交基分解(POD) GALERKIN 

分 类 号：TL33[核科学技术—核技术及应用]