弥散型燃料元件等效热传导系数的有限元模拟  

Finite Element Simulation for Effective Thermal Conductivity Coefficient of Dispersion Fuel Element

作　　者：姜馨[1] 丁淑蓉[1] 霍永忠[1] 

机构地区：[1]复旦大学力学与工程科学系,上海200433

出　　处：《核动力工程》2010年第3期45-49,共5页Nuclear Power Engineering

基　　金：国家自然科学基金(10672042;10772049);国家高技术研究发展计划(863计划)(2009AA04Z408)

摘　　要：弥散型燃料元件的热传导与燃料颗粒的数量、形状、大小及其分布,以及元件的几何形状和堆芯内热工条件等密切相关。采用细观计算力学的方法,按照燃料颗粒不同的排布方式从整个元件中取出单胞和代表体积单元,运用有限元法计算了弥散型燃料元件在不同温度、燃耗和颗粒体积含量下的等效热传导系数,并和理论公式进行了比较。结果表明,计算值和Maxwell模型的理论值最为接近。The behavior of thermal conduction of dispersion fuel elements depends on the heat generation of the fissionable particles,the volume fraction and size and array mode of the particles,the geometrical configuration of the element and the thermal circumstance in the reactor core.Following the idea of micromechanics of particle reinforced composites,a representative volume element or a unit cell is chosen and the finite element analysis is applied to study the effective thermal conductivity coefficient of the fuel element.The effects of temperature,burnup and volume fraction of the fissionable particles on the coefficient are investigated in details.The results are compared with several analytical equations and indicate that the Maxwell’s model provides the best agreement with the FEM data.

关 键 词：弥散型燃料元件 等效热传导系数 细观力学 有限元法 

分 类 号：TL341[核科学技术—核技术及应用]