基于有限元计算的全陶瓷微封装燃料芯块等效热导率与微结构设计  

Effective thermal conductivity and microstructure design of fully ceramic microencapsulated fuel pellet based on finite element calculations

作　　者：张旭东 邓俊楷 马大衍[1] 曹慧颖 张瑞谦[3] 唐睿[3] ZHANG Xu-dong;DENG Jun-kai;MA Da-yan;CAO Hui-ying;ZHANG Rui-qian;TANG Rui(State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710049,China;Network Information Center,Xi’an Jiaotong University,Xi’an 710049,China;Science and Technology on Reactor Fuel and Materials Laboratory,Nuclear Power Institute of China,Chengdu 610213,China)

机构地区：[1]西安交通大学金属材料强度国家重点实验室,陕西西安710049 [2]西安交通大学网络信息中心,陕西西安710049 [3]中国核动力研究设计院反应堆燃料及材料重点实验室,四川成都610213

出　　处：《兰州理工大学学报》2022年第2期9-15,共7页Journal of Lanzhou University of Technology

基　　金：中核集团领创科研基金(J202107006);光合组织光合基金(202202012021)的资助。

摘　　要：为对全陶瓷微封装燃料(FCM)芯块的热导率进行有效研究,利用有限元方法实现球体法预测具有多层包覆结构特征的TRISO颗粒等效热导率;同时,利用跨尺度等效代表性体积单元对FCM芯块的等效热导率进行计算及优化设计.模拟结果表明:利用有限元模拟实现球体法及跨尺度等效方法可以实现对TRISO颗粒及FCM芯块等效热导率的快速准确预测,TRISO颗粒等效热导率可通过调节SiC层厚度实现提升.提出了将TRISO颗粒设计为FCC填充结构,可使FCM芯块中的燃料颗粒填充量更高,并且其等效热导率可得到显著提升.To study the thermal conductivity of a fully ceramic microencapsulated(FCM)pellet,the sphere method was used to predict the effective thermal conductivity of the multilayered tri-isotropic(TRISO)particle by finite element method.Meanwhile,the effective thermal conductivity of the FCM pellet was calculated by a multi-scale equivalent representative volume element method and optimized by adjusting the content and distribution of TRISO particles.The simulation results showed that the effective thermal conductivity of the TRISO particle and FCM pellet can be predicted quickly and accurately by using the sphere method and the multi-scale equivalent method,and the effective thermal conductivity of the TRISO particle can be improved by adjusting the thickness of the SiC layer.An FCC-stacked microstructure using TRISO presented to make the FCM pellet possesse higher content fuel particles and exhibits improved heat conduction performance.

关 键 词：全陶瓷微封装燃料(FCM) TRISO颗粒 热导率 有限方法 

分 类 号：TB303[一般工业技术—材料科学与工程]