摇摆条件下含花瓣形棒束自然循环系统特性  

Characteristics of natural circulation systems with petal-shaped fuel bundle channels under rolling motion

作　　者：曹今毅 孙建闯 孟祥飞 张文超[1,2] 杜利鹏 蔡伟华[1,2] CAO Jinyi;SUN Jianchuang;MENG Xiangfei;ZHANG Wenchao;DU Lipeng;CAI Weihua(School of Energy and Power Engineering,Northeast Electric Power University,Jilin 132012,China;Laboratory of Thermo-fluid Science and Nuclear Engineering,Northeast Electric Power University,Jilin 132012,China;China Nuclear Power Technology Re-search Institute Co.,Ltd,Shenzhen 518031,China)

机构地区：[1]东北电力大学能源与动力工程学院,吉林吉林132012 [2]东北电力大学热流科学与核工程实验室,吉林吉林132012 [3]中广核研究院有限公司,广州深圳518031

出　　处：《哈尔滨工程大学学报》2023年第12期2216-2223,共8页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(52306227).

摘　　要：为获得摇摆下含3×3花瓣形棒束通道自然循环特性,本文基于区域分解法,采用自编一维程序和三维CFD软件构建摇摆条件下多尺度耦合数值模型。依据已有实验数据验证了模型可靠性,并分析了摇摆对花瓣形棒束通道内流动特性的影响。结果表明:加热功率升高使回路中冷、热流体温差增大,自然循环流量时均值增加,系统更加稳定;流体温度增加使近壁面流体粘度减小,阻力系数降低。此外,通过引入瞬时摇摆雷诺数,获得适用于摇摆条件下低雷诺数范围的流动阻力系数表达式。本文可为花瓣形燃料组件在海基核动力装置的应用提供设计依据。To study the natural circulation characteristics of petal-shaped fuel bundle channels under rolling motion,a multiscale coupled numerical model was developed using the domain decomposition method,a self-designed 1D code,and 3D computational fluid dynamics software.The model′s reliability was verified using existing experimen-tal data,and the effect of rolling motion on the flow characteristics of a natural circulation system with petal-shaped fuel bundle channels was thoroughly analyzed.The results show that increased heating power can increase the tem-perature difference between the cold and hot legs in the loop.Consequently,the average flow rate increases and tends to stabilize.Increasing the fluid temperature reduces the viscosity of the fluid near the wall,thereby decrea-sing the resistance coefficient of the rod bundle channel.By introducing the instantaneous rolling Reynolds number,we obtained an expression for the resistance coefficient applicable to the low Reynolds number range under rolling motion.This study provides an important design basis for the application of petal-shaped fuel assemblies in sea-based nuclear power plants.

关 键 词：自然循环系统 花瓣形燃料棒 摇摆运动 多尺度耦合模拟 流动特性 压降 摇摆雷诺数 阻力系数 

分 类 号：TL334[核科学技术—核技术及应用]