铅铋流体作用下螺旋管束的流致振动机理研究  

Investigation on mechanism of flow induced vibration of spiral tube bundle in cross lead bismuth flow

作　　者：王正阳 瞿叶高 余晓菲[2] 陈果 黄旋[2] 彭志科[1] WANG Zhengyang;QU Yegao;YU Xiaofei;CHEN Guo;HUANG Xuan;PENG Zhike(School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Nuclear Power Institute of China,Chengdu 610213,China)

机构地区：[1]上海交通大学机械与动力工程学院,上海200240 [2]中国核动力研究设计院,成都610213

出　　处：《核技术》2021年第11期73-81,共9页Nuclear Techniques

基　　金：国家重大科技专项计划(No.2019ZX06004001)资助。

摘　　要：流体外掠螺旋管束引起的流致振动在工程实际中广泛存在,传统研究的流体介质多为水和空气,而近年来铅铋流体正逐渐成为一种新兴的热交换介质。针对铅铋流体作用下的单排螺旋管束流致振动问题,利用计算流体动力学方法和有限元方法,对单排螺旋管束流致振动进行了数值建模与仿真计算,揭示了不同来流速度下管束的流致振动机理。结果表明:铅铋流体作用下单排管束周围会产生漩涡脱落,其频率随着来流速度的升高逐渐增大;管束各管道之间的漩涡脱落存在干涉现象,中间管道的振动响应以漩涡脱落频率的二倍频振动为主,而两侧管道的振动响应主要频率分量为漩涡脱落频率,且伴随有倍频振动响应出现;随着来流速度升高,管道之间的流动干涉对管道振动的倍频振动响应影响逐渐减弱;当铅铋来流速度超过一定值后,管道振幅突然增大,管道发生流弹失稳现象。[Background]The flow induced vibration of spiral tube bundle widely exists engineering practice.The traditional fluid medium is water and air,whilst lead bismuth fluid has gradually become a new heat exchange medium in recent years.[Purpose]This study aims to analyze the flow induced vibration of single row tube bundle in cross lead bismuth flow.[Methods]The computational fluid dynamics(CFD)analysis code FLUENT and the finite element analysis code ANSYS were used to simulate the flow induced vibration of a single row spiral tube bundle.The flow field profile and structural response at different times were analyzed respectively,and the corresponding relationship between the flow field change and structural vibration was explored.The physical insight into the flow induced vibration of the tube bundle was provided.[Results&Conclusions]Simulation results show that the vortex shedding occurs in the single row tube bundle in the cross lead bismuth,and the frequency of vortex shedding increases with the increase of the flow velocity.Due to the interference of vortex shedding between the pipes,the vibration frequency of the middle pipe is mainly two times of vortex shedding frequency,while the vibration response of the pipes on both sides is dominated by the vortex shedding frequency,accompanied by a small frequency doubling.With the increase of the flow velocity,the influence of the interference between pipelines on the frequency doubling vibration response of pipeline vibration is gradually weakened.When the inlet velocity exceeds a certain value,the amplitude of the pipe increases suddenly,causing fluid-elastic instability of the pipelines.

关 键 词：螺旋管束 流致振动 铅铋流体 漩涡脱落 流弹失稳 

分 类 号：TL334[核科学技术—核技术及应用]