摘要
螺旋管束因其结构紧凑、传热效率高,在铅铋快堆中获得广泛应用,为支撑铅铋快速的工程设计与安全验证,需分析其在铅铋介质中的流致振动特性对工程设计及安全验证至关重要。本文基于自主设计的实验系统,采用连续小波变换和快速傅里叶变换方法,研究了常压、200℃下横流液态铅铋介质中螺旋管束无管内流时的流致振动特性,折减流速范围为0.15~2.15。研究结果表明:螺距比对流致振动特性有显著影响,螺距比在1.2~1.5时螺旋管束临界流速随螺距比增大而增加,螺距比在1.5~1.8时其临界流速随之减小。最大李亚普诺夫指数随折减流速增大而增加,发生漩涡脱落时出现极值,并得到了铅铋介质中单排和交错排列螺旋管束发生漩涡脱落时的斯特劳哈尔数范围。本文研究结果有助于优化螺旋管束的设计,提高铅铋快堆的流动安全性,为工程设计和安全验证提供理论支持。
The spiral tube bundle,owing to its compact structure and high heat transfer efficiency,is widely used in lead-bismuth eutectic fast reactors.In order to support the engineering design and safety verification of lead-bis-muth fast reactors,it is necessary to analyze the flow-induced vibration characteristics of spiral tube bundles in lead-bismuth medium.Based on a self-designed flow-induced vibration experimental system,this study investigates vibration characteristics of a spiral tube bundle subjected to cross-flow lead-bismuth eutectic at atmospheric pressure and 200℃,with no internal flow within the tubes.The vibration behavior is characterized using continuous wavelet transform and fast Fourier transform methods.The reduced velocity ranges from 0.15 to 2.15.The results show that when the pitch ratio is within the range of 1.2~1.5,the critical flow velocity of the spiral tube bundle increases as the pitch ratio increases,whereas when the pitch ratio is within the range of 1.5~1.8,the critical flow velocity decreases.The maximum Lyapunov exponent increases with the increase in reduced velocity and reaches a peak when vortex shedding occurs.Finally,the Strouhal number ranges for single-row and staggered spiral tube bundles in lead-bismuth eutectic were obtained.The results help optimize the design of spiral tube bundles and provide a the-oretical foundation for engineering design and safety validation.
作者
殷一博
田瑞峰
乔鹏瑞
温济铭
高璞珍
李晓曦
王斐然
谭思超
YIN Yibo;TIAN Ruifeng;QIAO Pengrui;WEN Jiming;GAO Puzhen;LI Xiaoxi;WANG Feiran;TAN Sichao(College of Nuclear Science and Technology,Harbin Engineering University,Harbin 150001,China;China Institute of Atomic Energy,Beijing 102413,China)
出处
《哈尔滨工程大学学报》
北大核心
2025年第11期2329-2340,共12页
Journal of Harbin Engineering University
基金
国家自然科学基金项目(U22B2093).
关键词
螺旋管束
流致振动
铅铋介质
连续小波变换
最大李雅普诺夫指数
螺距比
漩涡脱落
斯特劳哈尔数
spiral tube bundle
flow-induced vibration
lead-bismuth eutectic
continuous wavelet transforms
maximum Lyapunov exponent
pitch ratio
vortex shedding
Strouhal number
