摘要
液态金属铅铋的密度与黏度均远大于水,在反应堆中引起的燃料组件流致振动及磨损问题不可忽视.该文采用计算流体力学与有限元结构动力分析相结合的流固耦合分析方式,利用空间周期性与时间周期性,提出了绕丝燃料棒湍流振动响应的快速分析方法.利用绕丝燃料棒的空间周期结构建立单跨流场模型,基于CFD分析获得了铅铋环境流体激励载荷;利用湍流激励力功率谱密度的频域信息,开发等效时程扩展技术获得了用于振动分析的长时程载荷;考虑绕丝燃料棒间的非线性接触碰撞,建立有限元分析模型开展了振动响应分析.结果表明,轴向流动的液态铅铋会引起绕丝燃料棒的湍流抖振,最大振幅约为3.83μm,满足工程设计要求.
The density and viscosity of liquid lead⁃bismuth metal are much larger than those of water,which causes nonnegligible flow induced vibration(FIV)and wear problems of fuel assemblies in the reactor.With the fluid⁃structure coupled analysis method combining the CFD and the FEM,a rapid analysis method for the turbu⁃lent vibration responses of wire⁃wrapped fuel rods was proposed in view of the spatial periodicity and time peri⁃odicity.For the space periodic structure of wire⁃wrapped fuel rods,a single⁃span flow field model was estab⁃lished,and the lead⁃bismuth environment fluid excitation load was obtained based on the CFD analysis.From the frequency domain information of the turbulent excitation force PSD,the equivalent time history extrapola⁃tion technique was developed to obtain long⁃duration loads for vibration analysis.With the nonlinear contact between the wire⁃wrapped fuel rods considered,an FEM model was established to carry out the vibration analy⁃sis.The results show that,the axial flow of liquid lead⁃bismuth causes turbulent vibrations of fuel rods,with a maximum amplitude of 3.83μm,which meets the engineering design requirement.
作者
张珂
王远岑
黄茜
刘建
张毅雄
余晓菲
齐欢欢
ZHANG Ke;WANG Yuancen;HUANG Qian;LIU Jian;ZHANG Yixiong;YU Xiaofei;QI Huanhuan(State Key Laboratory of Advanced Nuclear Energy Technology,Nuclear Power Institute of China,Chengdu 610213,P.R.China;Institute of Systems Engineering,China Academy of Engineering Physics,Mianyang,Sichuan 621900,P.R.China)
出处
《应用数学和力学》
北大核心
2025年第6期730-741,共12页
Applied Mathematics and Mechanics
基金
四川省自然科学基金(2022NSFSC1943)。
关键词
绕丝燃料棒
流致振动
湍流抖振
铅铋环境
wire⁃wrapped fuel rod
flow induced vibration
turbulent vibration
lead⁃bismuth fluid environment
