非结构网格变分节块法在氦氙冷却小型反应堆中的应用  

Application of Unstructured Mesh Variational Nodal Method in He-Xe Cooled Micro Reactor

作　　者：孙启政 刘晓晶[1] 张滕飞 Sun Qizheng;Liu Xiaojing;Zhang Tengfei(School of Nuclear Science and Engineering,Shanghai Jiao Tong University,Shanghai,200240,China)

机构地区：[1]上海交通大学核科学与工程学院,上海200240

出　　处：《核动力工程》2024年第5期26-31,共6页Nuclear Power Engineering

基　　金：国家重点研发计划(2020YFB1901900);国家自然科学基金面上项目(12175138)。

摘　　要：先进小型反应堆设计方案具有复杂的几何结构和较强的中子泄漏特征。为更准确地对复杂几何的先进小型反应堆设计的中子学特性进行分析,本研究提出了一种基于离散纵标(S_(N))的非结构网格变分节块法(UVNM-S_(N))。UVNM-S_(N)从二阶偶对称输运方程的泛函形式出发,在空间上采用任意三角形非结构网格以及坐标变换技术,角度上则采用S_(N)将原方程进行解耦;选取了氦氙(He-Xe)冷却小型反应堆SIMONS作为分析对象,验证了UVNM-S_(N)在实际应用对象中的性能。计算结果表明,UVNM-S_(N)在复杂几何的非均匀问题中具有良好的几何适应性以及计算精度,可为先进反应堆数值模拟提供新的计算思路。Advanced designs of micro reactors are distinguished by intricate geometries and pronounced neutron leakage.To enhance the precision of neutron property analysis in these complex geometrical designs,this study introduces an Unstructured Mesh Variational Nodal Method(UVNM-S_(N)).The UVNM-S_(N) method initiates from the functional formulation of the second-order even-parity neutron transport equation.Spatially,arbitrary triangular unstructured meshes and coordinate mapping techniques are employed.Besides,angular decoupling of the original equations is achieved through the application of the discrete-ordinate(S_(N))method.Furthermore,the SIMONS design,a helium-xenon(He-Xe)-cooled micro reactor,is chosen as the analytical subject to verify the performance of the UVNM-S_(N).Numerical results demonstrate that UVNM-S_(N) exhibits geometric adaptability and computational precision in heterogeneous problems with complex geometries.Consequently,it is concluded that UVNM-S_(N) can stand as an innovative strategy for numerical simulations in advanced micro-reactor designs.

关 键 词：变分节块法(VNM) 非结构网格 氦氙冷却小型反应堆 离散纵标(S_(N)) 

分 类 号：TL329[核科学技术—核技术及应用]