Nonlinear vibrations analysis of a fuel rod in nuclear heating reactor

IF 3.3 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Progress in Nuclear Energy Pub Date : 2024-11-30 DOI:10.1016/j.pnucene.2024.105531

Musen Lin, Dingqu Wang, Junzheng Zheng, Yueyuan Jiang

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Abstract

Nonlinear vibrations of a single fuel rod in nuclear heating reactor with fixed-fixed ends and subjected to various excitation levels are comprehensively analyzed using explicit dynamics. The responses of empty, pellet-filled, and water-submerged rod are investigated. Pellet-cladding and pellet-pellet interactions are addressed by a penalty-based contact treatment, meanwhile the fluid-structure interactions (FSI) between the vibrating fuel rod and surrounding coolants are simulated by the Arbitrary Lagrangian-Eulerian (ALE) method, wherein the water is modeled as Eulerian elements. The results reveal that both empty and pellet-filled rods exhibit frequency hardening phenomena, where eigenfrequencies increase with vibration amplitude due to geometric nonlinearity. The damping decay resulting from fuel pellet motions is found to be positively correlated with vibration amplitude, thereby enhancing the reactor safety. For submerged rod, the frequency decreases due to added mass effects, and the overall system damping increases despite structural damping from dry friction and impacts is reduced.

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核加热堆燃料棒非线性振动分析

用显式动力学方法全面分析了不同激励水平下核加热堆单燃料棒的非线性振动。研究了空棒、填充棒和浸水棒的响应。球团包层和球团之间的相互作用通过基于惩罚的接触处理来解决，同时，通过任意拉格朗日-欧拉（ALE）方法模拟了振动燃料棒与周围冷却剂之间的流固相互作用（FSI），其中水被建模为欧拉单元。结果表明，空棒和填充棒均表现出频率硬化现象，由于几何非线性，特征频率随振动幅值的增加而增加。发现燃料球团运动引起的阻尼衰减与振动幅值呈正相关，从而提高了反应堆的安全性。对于水下抽油杆，由于附加的质量效应，频率降低，尽管干摩擦和冲击造成的结构阻尼减少，但整体系统阻尼增加。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Progress in Nuclear Energy 工程技术-核科学技术

CiteScore

5.30

自引率

14.80%

发文量

331

审稿时长

3.5 months

期刊介绍： Progress in Nuclear Energy is an international review journal covering all aspects of nuclear science and engineering. In keeping with the maturity of nuclear power, articles on safety, siting and environmental problems are encouraged, as are those associated with economics and fuel management. However, basic physics and engineering will remain an important aspect of the editorial policy. Articles published are either of a review nature or present new material in more depth. They are aimed at researchers and technically-oriented managers working in the nuclear energy field. Please note the following: 1) PNE seeks high quality research papers which are medium to long in length. Short research papers should be submitted to the journal Annals in Nuclear Energy. 2) PNE reserves the right to reject papers which are based solely on routine application of computer codes used to produce reactor designs or explain existing reactor phenomena. Such papers, although worthy, are best left as laboratory reports whereas Progress in Nuclear Energy seeks papers of originality, which are archival in nature, in the fields of mathematical and experimental nuclear technology, including fission, fusion (blanket physics, radiation damage), safety, materials aspects, economics, etc. 3) Review papers, which may occasionally be invited, are particularly sought by the journal in these fields.