基于网格变形法铅铋快堆组件堵流事故模拟  

Simulation of Blockage Accident of LBE-Cooled Fast Reactor Fuel Assembly Based on Mesh Deformation Method

作　　者：刘政隆 秋涵瑞 王明军[1] 孙浩 田文喜[1] 苏光辉[1] Liu Zhenglong;Qiu Hanrui;Wang Mingjun;Sun Hao;Tian Wenxi;Su Guanghui(School of Nuclear Science and Technology,Xi’an Jiaotong University,Xi’an,710049,China;China Nuclear Power Technology Research Institute Co.,Ltd.,Shenzhen,Guangdong,518000,China)

机构地区：[1]西安交通大学核科学与技术学院,西安710049 [2]中广核研究院有限公司,广东深圳518000

出　　处：《核动力工程》2024年第3期95-103,共9页Nuclear Power Engineering

摘　　要：铅铋快堆中,燃料包壳或堆内结构材料会受铅铋合金腐蚀而脱落,堵塞冷却剂通道,引起局部传热恶化,最终导致包壳失效,因此需要分析堵流条件下组件内流动换热特性。绕丝组件结构复杂,非结构化网格划分方法网格量大,对计算资源要求较高。为减少网格量,采用基于径向基函数(RBF)的网格变形法对光棒组件网格进行变形,得到带绕丝组件全六面体网格并开展数值计算。与实验数据相比,全六面体网格计算结果与实验值符合良好,其网格量远少于非结构化网格,能够实现带绕丝组件堵流事故快速计算。开展典型61棒带绕丝组件堵流计算,结果显示柱状堵流流场恢复更快而局部温升更高;板状堵流流场需要更长距离恢复但局部温升小。In LBE-cooled fast reactors,the fuel rod claddings or structural materials in the reactor will fall off due to corrosion of LBE.When corroded by LBE,which will block the coolant channel,cause local heat transfer deterioration and eventually lead to cladding failure.Therefore,it is necessary to analyze the flow and heat transfer characteristics in the assembly under the condition of blockage.The structure of wire-wrapped assembly is complex,and the unstructured grid division method has a large grid quantity,which requires high computing resources.In order to reduce the grid quantity,the mesh deformation method based on radial basis function is used to deform the grid of bare rod assembly,and the hexahedral grid with wire-wrapped assembly is obtained and numerical calculation is carried out.The calculated results of the hexahedral grid are in good agreement with the experimental data,and the grid quantity is much less than that of the unstructured grid,which can realize the rapid calculation of the blockage accident of wire-wrapped assemblies.Furthermore,calculations for two different types of blockages were performed in a typical wire-wrapped fuel assembly with 61 pins.The results show that for column-type blockage,the flow field recovers faster but with a higher local temperature rise;for plate-type blockage,the flow field recovers more slowly but the local temperature rise is small.

关 键 词：铅铋快堆组件 堵流事故 计算流体动力学(CFD) 径向基函数(RBF) 网格变形 

分 类 号：TL333[核科学技术—核技术及应用]