直交二相流による管群の流体振動に関する研究 : 第1報,水-空気二相流による大振幅振動の発生

概要

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Large amplitude vibration caused by a high-speed air water two-phase flow is investigated. It is thought to be the same phenomenon as fluid-elastic vibration. However, it intermittently occurs and is not so great as to damage the tubes. Small-size test tube bundles, whose natural frequencies are tuned to adequate low frequencies, are excited by an air-water two-phase flow. The air velocity is increased step by step, while the water velocity is kept constant. The amplitude of the tubes is gradually increased with the increase of flow velocity, and is not abruptly changed as is likely by the single-phase flow. However, the phenomenon can be distinguished from random excitation. The method to decide the threshold velocity of this new type of instability is proposed by comparison with the test results of the single-phase flow.
社団法人日本機械学会の論文
1986-01-25