基于等效导热系数理论模型的全陶瓷微封装燃料峰值温度预测方法  

Peak Temperature Prediction Method Based on A Theoretical Model of Equivalent Thermal Conductivity for Fully Ceramic Microencapsulated Fuel

作　　者：王某浩 步珊珊 周冰 李振中 陈德奇[1] Wang Mouhao;Bu Shanshan;Zhou Bing;Li Zhenzhong;Chen Deqi(Key Laboratory of Low-Grade Energy Utilization Technologies and Systems,Ministry of Education,Chongqing University,Chongqing,400044,China;Southwestern Institute of Physics,Chengdu,610225,China)

机构地区：[1]重庆大学低品位能源利用技术及系统教育部重点实验室,重庆400044 [2]核工业西南物理研究院,成都610225

出　　处：《核动力工程》2024年第1期41-48,共8页Nuclear Power Engineering

基　　金：国家自然科学基金项目(52276052)。

摘　　要：为了满足工程上对全陶瓷微封装(FCM)燃料峰值温度快速预测的需求,可以将燃料的等效导热系数代入至简化的均质导热模型中进行燃料峰值温度的反计算。本文基于前期提出的多环导热模型,从基本导热方程出发,以燃料峰值温度为守恒量,将多环模型进一步等效为均质模型,推导了FCM燃料等效导热系数计算理论模型,并将该模型与常规等效导热系数理论模型进行对比。结果表明:本文构建的理论模型可以在多环模型的基础上结合均质模型从而有效地实现对燃料峰值温度的预测。该方法所预测的峰值温度值与实际值偏差基本在3%以内,因而可适用于对含内热源FCM燃料元件峰值温度的预测。本文建立的基于等效导热系数理论模型的预测方法可实现对FCM燃料峰值温度的快速预测。In order to satisfy the engineering need for rapid prediction of peak temperatures of Fully Ceramic Microencapsulated(FCM)fuels,inverse calculations of peak fuel temperatures could be performed by substituting the equivalent thermal conductivity of the fuel into a simplified homogeneous thermal conductivity model.In this paper,based on the multi-annulus model developed in previous study,a theoretical model for calculating the equivalent thermal conductivity of FCM fuel is derived by starting from the basic thermal conductivity equation and taking the peak fuel temperature as a conserved quantity,and the multi-annulus model is further equivalent to a homogeneous model.Then the derived model is compared with some conventional equivalent thermal conductivity theoretical models.The results show that the developed theoretical model could be combined with the homogeneous model to effectively achieve the prediction of peak fuel temperatures.The developed theoretical method is suitable for predicting the peak temperature of FCM fuel elements with internal heat sources,because the deviation between the predicted peak temperature and the actual value is basically within 3%.The developed theoretical model prediction method based on equivalent thermal conductivity could realize the rapid prediction of the peak temperature of FCM fuel.

关 键 词：全陶瓷微封装(FCM)燃料 三结构同向性型(TRISO)燃料 等效导热系数 多环导热模型 峰值温度预测 

分 类 号：TL333[核科学技术—核技术及应用]