한국소음진동공학회논문집 (Transactions of the Korean Society for Noise and Vibration Engineering)

  • 제16권11호
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  • Pages.1115-1123
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  • 2006
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  • 1598-2785(pISSN)
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  • 2287-5476(eISSN)
한국소음진동공학회 (The Korean Society for Noise and Vibration Engineering)
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균일한 축방향 유동에 노출된 핵 연료봉의 진동특성 분석

Vibration Characteristics of a Nuclear Fuel Rod in Uniform Axial Flow

  • 발행 : 2006.11.20
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초록

Nuclear fuel rods are exposed to axial flow in a reactor, and flow-induced-vibration due to the flow usually causes damage in the fuel rods. Thus a prior knowledge about dynamic behavior of a fuel rod exposed to the flow condition should be provided. This paper shows that dynamic characteristics of a nuclear fuel rod depend on axial flow velocity. Assuming small lateral displacement, the effects of uniform axial flow are investigated. The analytic results show that axial flow generally reduces fuel rod stiffness and raises its damping in normal condition. Also, the critical axial velocities which make the fuel rod behavior unstable were found. That is, solving generalized eigenvalue equation of the fuel rod dynamic system, the eigenvalues with positive real part are detected. Based on the simulation results, on the other hand, it turns out that the ordinary axial flow in nuclear reactors does not affect to stability of a nuclear fuel rod even in the conservative condition.

키워드

참고문헌

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피인용 문헌

  1. Vibration Simulation Using LuGre Friction Model for Cladding Tube Fretting Wear Analysis vol.26, pp.1, 2016, https://doi.org/10.5050/KSNVE.2016.26.1.055