文章编号：1004－5422(2021)03－0274－05                                               DOI:10.3969/j.issn.1004-5422.2021.03.009

冯志鹏, 齐欢欢, 黄  茜, 黄  旋, 陈  果,张毅雄

(中国核动力研究设计院，核反应堆系统设计技术重点实验室,四川  成都  610213)

摘  要：燃料棒包壳磨损是燃料组件设计中最关注的现象，流致振动引起的燃料棒与格架间的微动磨损是造成燃料棒失效的一个重要原因.采用理论分析、数值模拟与程序开发相结合的方式，完成了压水堆燃料组件流致振动及其诱发的微动磨损的分析评价方法与关键技术研发.首先，基于有限元方法建立燃料棒—格架支撑相互作用的振动分析模型，获得了燃料棒的动态特性，并为专用分析程序提供关键输入参数；其次，利用随机振动理论，从经受湍流作用的薄圆柱体振动响应的理论分析出发，针对湍流激励、流弹失稳和漩涡脱落3种流致振动机理，建立了燃料棒振动响应的理论模型，基于振动分析得到的响应和ARCHARD公式，建立了燃料棒的微动磨损分析模型，并开发了专用程序；最后，完成了燃料棒流致振动及微动磨损的工程应用，形成了一套评价压水堆燃料棒流致振动与微动磨损行为的分析方法与分析工具.
关键词：燃料组件；流致振动；微动磨损；压水堆
中图分类号：TL421+.1;TL352                 文献标识码：A

Research on Key Technology of Flow Induced Vibration of Fuel Assembly 

at Water Pressurized Reactor

FENG Zhipeng, QI Huanhuan, HUANG Qian, HUANG Xuan, CHEN Guo, ZHANG Yixiong

(Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu 610213,China)

Abstract：Fuel rod cladding wear is the most concerned phenomenon in fuel assembly design. Fretting wear between fuel rod and grid caused by flow induced vibration is an important reason for fuel rod failure. In this paper, theoretical analysis, numerical simulation and program development are used to analyze and evaluate the flow induced vibration and fretting wear of PWR fuel assemblies. Firstly, the vibration analysis model of rod-grid interaction is established based on the finite element method. The dynamic characteristics of fuel rod are obtained, and the key input parameters are also provided for the specific analysis program. Secondly, three flow induced vibration mechanisms: turbulence excitation, fluid elastic instability and vortex shedding are analyzed based on the theoretical analysis of vibration response of thin cylinder subjected to turbulence flow. The theoretical mode of fuel rod vibration response is established based on the response obtained from vibration analysis and ARCHARD formula. Then, a fretting wear analysis model of fuel rod is established and a specific program is developed. Finally, the engineering application of fuel rod flow induced vibration and fretting wear is completed, and a set of analysis method and analysis tools for evaluating flow induced vibration and fretting wear behavior of PWR fuel rod is formed.
Key words：fuel assembly;flow-induced vibrations;fretting wear;pressurized water reactor