Strouhal Number Effect on Synchronized Vibration Range of a Circular Cylinder in Cross Flow
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概要
- 論文の詳細を見る
Synchronized vibrations were measured for a circular cylinder in a water cross flow at subcritical Reynolds numbers to compare the synchronization range between the subcritical and supercritical regions and clarify the effect of the Strouhal number on the range. A small vibration in the lift direction was found in only the subcritical region when the Karman vortex shedding frequency was about 1/5 of the cylinder natural frequency. The ratio of the Karman vortex shedding frequency to the natural frequency where the self-excited vibration in the drag direction by the symmetrical vortex shedding began was about 1/4 in the subcritical region, and increased to 0.32 at the Strouhal number of 0.29 in the supercritical region. The frequency ratio at the beginning of the lock-in vibration in the drag direction by the Karman vortex shedding was about 1/2,and that in the lift direction decreased from 1 to 0.8 with decreasing Strouhal number.
- 一般社団法人日本機械学会の論文
- 2001-11-15
著者
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Murayama Kouichi
Nuclear Systems Division Hitachi Ltd.
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Nakao Toshitsugu
Group Business Planning Division Hitachi Ltd.
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KAWAMURA Tsutomu
Power & Industrial Systems R&D Laboratory, Hitachi, Ltd.
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Hayashi Masaaki
Group Business Planning Division Hitachi Ltd.
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Kawamura Tsutomu
Power & Industrial Systems R & D Laboratory Hitachi Ltd.
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