Nuclear Engineering and Technology

  • 제56권4호
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  • Pages.1407-1424
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  • 2024
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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A coupled vibration model of double-rod in cross flow for grid-to-rod fretting wear analysis

  • H. Huang (Southwest Jiaotong University, School of Aerospace and Engineering) ;
  • T. Liu (Shanghai Jiaotong University, School of Mechanical Engineering) ;
  • P. Li (Southwest Jiaotong University, School of Aerospace and Engineering) ;
  • Y.R. Yang (Southwest Jiaotong University, School of Aerospace and Engineering)
  • 투고 : 2023.08.28
  • 심사 : 2023.11.26
  • 발행 : 2024.04.25
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초록

In Pressurized Water Reactors, most of the failed fuel rods are often observed at the periphery of the fuel assembly, especially near the core baffle. The rod vibration-induced fretting wear is a significant failure mechanism strongly correlated with the coolant and support conditions. This paper presents a coupled vibration model of double-rod to predict the grid-to-rod fretting (GTRF) wear. A motion-dependent fluid force model is used to simulate the coolant cross flow, the gap constraints with asymmetric stiffness between spring and dimple on the vibration form, and the fretting wear are discussed. The results show the effect of the coupled vibration on the deterioration of wear, providing a sound theoretical explanation of some failure phenomena observed in the previous experiment. Exploratively, we analyze the impact of the baffle jet on the GTRF wear, which indicates that the high-velocity cross-flow will significantly affect the vibration forms while sharply changing the wear behavior.

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과제정보

This work is supported by the National Natural Science Foundation of China (Grant Nos: 12072298; 12172311).

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