事故容错燃料结构对导热性能影响的计算  

Evaluation of influence of fault tolerant fuel structure on thermal conductivity

作　　者：张海青[1] 卢林远 王鹏[1] 严超[1] 林俊[1] ZHANG Haiqing;LU Linyuan;WANG Peng;YAN Chao;LIN Jun(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China)

机构地区：[1]中国科学院上海应用物理研究所,上海201800

出　　处：《核技术》2021年第3期90-96,共7页Nuclear Techniques

基　　金：上海市自然科学基金面上项目——多孔石墨作为熔盐相变储热载体的协同传热储热机制研究(No.20ZR1468800);甘肃省自然科学基金一般项目——高效相变储热元件的封装技术及应用研究(No.20JR5RE639)。

摘　　要：事故容错热导率增强型核燃料的研究关注点主要在于制备工艺的优化和导热性能的改善,而微观结构的调控是改善导热性能的主要手段之一。目前国内外提出的事故容错燃料,主要是在基体颗粒中添加高热导率的颗粒以提高容错燃料的热导率。本文建立了事故容错燃料的三维有限元模型,采用Ansys Workbench对不同容错燃料热导率进行数值模拟,计算分析了二氧化铀基体中添加氧化铍颗粒时,颗粒的形状、空间取向、排列方式、大小等对热导率的影响,获得了热导率随氧化铍颗粒形状、空间取向、排列方式、大小等变化的规律。[Background]The research focus of accident tolerant enhanced thermal conductivity nuclear fuel mainly lies in the optimization of the preparation process and the improvement of the thermal conductivity whilst the control of microstructure is one of the main means to improve the thermal conductivity.So far the fault tolerant fuel in the world is mainly adding high thermal conductivity particles into the matrix particles to improve the thermal conductivity of fault tolerant fuel.[Purpose]This study aims to evaluate the influence of fault-tolerant fuel structure on thermal conductivity.[Methods]First of all,a three-dimensional finite element model of fault-tolerant fuel was established.Then,based on Ansys Workbench and this model,thermal conductivities of different fault-tolerant fuel were calculated by simulation.Effects of the shape and space of the beryllium oxide particles added to uranium dioxide matrix on thermal conductivity were analyzed.[Results&Conclusions]The variations of thermal conductivity with the shape,spatial orientation and allocation of beryllium oxide particles are obtained.It provides a reference for the selection of fault tolerant fuel.

关 键 词：事故容错燃料 热导率 热流密度 界面热阻 

分 类 号：TL99[核科学技术—核技术及应用]