弥散型核燃料热导率计算模型研究  

Study on Thermal Conductivity Model of Dispersion Fuel

作　　者：任啟森 廖业宏 陈蒙腾 张永栋 谢亦然 刘彤 刘伟强 Ren Qisen;Liao Yehong;Chen Mengteng;Zhang Yongdong;Xie Yiran;Liu Tong;Liu Weiqiang(Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen,Guangdong,518055,China;China Nuclear Power Technology Research Institute Co.,Ltd.,Shenzhen,Guangdong,518031,China)

机构地区：[1]清华大学深圳国际研究生院,广东深圳518055 [2]中广核研究院有限公司,广东深圳518031

出　　处：《核动力工程》2020年第5期40-43,共4页Nuclear Power Engineering

基　　金：国家科技重大专项(2015ZX06004001);国家重点研发计划(2017YFB0702404)。

摘　　要：弥散型燃料热导率是反应堆安全分析和燃料元件性能评估中的重要参数。本文基于多孔物体热导率理论,考虑基体中弥散颗粒分布相关性的影响,建立弥散型燃料热导率的计算模型,并初步验证了模型的合理性,在此基础上研究了孔隙率、燃料相体积分数以及燃料相/基体热导率比对弥散型燃料热导率的影响。结果表明:弥散型燃料热导率随燃料相体积分数和孔隙率的增加而降低;燃料相与基体热导率之比越大,燃料相体积分数对热导率的影响越小。The effective thermal conductivity(ETC)of dispersion fuels plays an important role in nuclear reactor safety analysis and fuel performance evaluation.In this study,based on the theory of porous body,considering the relativity of dispersion particle distributions,an ETC model of dispersion fuels was proposed and validated.The effect of porosity,fuel volume fraction and fuel-matrix thermal conductivity ratio on the ETC were investigated.The results show that the ETC decreases along with the increasing of fuel volume fraction and porosity;the higher the fuel-matrix thermal conductivity ratio is,the less the effect of fuel volume fraction on the ETC of dispersion fuel is.

关 键 词：事故容错 弥散型燃料 热导率 计算模型 

分 类 号：TL364[核科学技术—核技术及应用]