带格架5×5燃料棒束流致振动特性数值研究  

Numerical Study on Flow-induced Vibration Characteristics of 5×5 Rod Bundle with Spacer Grid

作　　者：陈德奇 刘海东[2] 黄彦平 袁德文[1] 王艳林[1] 高虹[2] CHEN Deqi;LIU Haidong;HUANG Yanping;YUAN Dewen;WANG Yanlin;GAO Hong(CNNC Key Laboratory on Nuclear Reactor Thermal hydraulics Technology Nuclear Power Institute of China, Chengdu 610041, China;Key Laboratory of Low-grade Energy Utilization Technologies and Systems Ministry of Education, Chongqing University, Chongqing 400044, China)

机构地区：[1]中国核动力研究设计院中核核反应堆热工水力技术重点实验室,四川成都610041 [2]低品位能源利用技术及系统教育部重点实验室,重庆大学,重庆400044

出　　处：《原子能科学技术》2018年第5期954-960,共7页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(51206199); 中央高校基本科研业务费资助项目(106112017CDJQJ148806)

摘　　要：核反应堆中,流动的冷却剂轴向冲刷燃料棒可能导致其振动,产生微动磨损,对整个核电厂的安全性以及经济性有重要影响。带格架棒束流致振动特性的研究是微动磨损研究的基础。本文基于欧拉-伯努利(Euler-Bernoulli)梁理论,采用动网格技术,通过Fluent实现流固耦合数值计算,并与不考虑振动耦合时的流场分布进行比较分析。重点分析了湍流强度、轴向速度等主要流体参数对振动位移均方根的影响,以及轴向流中流致振动机理。结果表明:燃料棒的振动位移均方根随着流速的增大而增大;燃料棒径向两侧的压力脉动是造成振动的因素之一;定位格架改变了较大振动出现的位置,明显加强了振动响应。In nuclear reactor,subjected to the axial flowing coolant,the fuel rod may vibrate.This vibration can cause cladding deformation and fretting wear that have an important effect on safety and economy of the entire nuclear power plant.Study on the vibration characteristics of the fuel rods with spacer grid is necessary for studying the fretting wear.In this paper,based on the Euler-Bernoulli beam theory,dynamic mesh technique was used to deal with the fluid-structure interaction numerical simulation by Fluent.The influence of the main fluid parameters on the RMS（root mean square）of vibration displacement,such as turbulence intensity and axial velocity,and the mechanism of flow-induced vibration in axial flow were analyzed in detail.The numericalresults show that the RMS of the vibration displacement of the fuel rod increases with the flow velocity,and the pressure pulsation on both sides of the fuel rod is one of the factors causing the vibration.The existence of the spacer grid changes the position of the large vibration displacement and significantly enhances the vibration response.

关 键 词：核反应堆 燃料组件 流致振动 数值研究 

分 类 号：TL334[核科学技术—核技术及应用]