Parallel two-phase-flow-induced vibrations in fuel pin model.
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概要
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This paper reports the experimental results of vibrations of a fuel pin model -herein meaning the essential form of a fuel pin from the standpoint of vibration- in a parallel air-and-water two-phase flow.<BR>The essential part of the experimental apparatus consisted of a flat elastic strip made of stainless steel, both ends of which were firmly supported in a circular channel con-veying the two-phase fluid. Vibrational strain of the fuel pin model, pressure fluctuation of the two-phase flow and two-phase-flow void signals were measured. Statistical measures such as power spectral density, variance and correlation function were calculated.<BR>The authors obtained (1) the relation between variance of vibrational strain and two-phase-flow velocity, (2) the relation between variance of vibrational strain and two-phase-flow pressure fluctuation, (3) frequency characteristics of variance of vibrational strain against the dominant frequency of the two-phase-flow pressure fluctuation, and (4) fre-quency characteristics of variance of vibrational strain against the dominant frequency of two-phase-flow void signals.<BR>The authors conclude that there exist two kinds of excitation mechanisms in vibrations of a fuel pin model inserted in a parallel air-and-water two-phase flow ; namely, (1) parametric excitation, which occurs when the fundamental natural frequency of the fuel pin model is related to the dominant travelling frequency of water slugs in the two-phase flow by the ratio 1/2, 1/1, 3/2 and so on ; and (2) vibrational resonance, which occurs when the fundamental frequency coincides with the dominant frequency of the two-phase-flow pressure fluctuation.
- 一般社団法人 日本原子力学会の論文
著者
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Hara Fumio
Department Of Mechanical Engineering Faculty Of Engineering Science University Of Tokyo
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YAMASHITA Tadashi
Department of Civil, Mechanical and Control Engineering, Kyushu Institute of Technology
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YAMASHITA Tadashi
Department of Mechanical Engineering, Tokyo University of Science
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