水平平面噴流による自励スロッシング振動発生機構の解明 (<小特集>流体関連振動・騒音等)

概要

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A self-induced sloshing is excited by flow without any other external force. In a rectangular tank having a horizontal plane jet, the 1 st or 2 nd mode sloshing grow in a certain condition of the inlet velocity and the water level. In this study, the experiment of this phenomenon was conducted and physical characteristics were examined in detail. The new sloshing conditions, i.e. "1st Stage Sloshing" and "2 nd Stage Sloshing", were discovered in a tank. The governing parameter of the sloshing growth, i.e. the modified Strouhal Number St_s, was derived approximately. When St_s was nearly either 1.0 (1 st Stage) or 2.0 (2 nd Stage), the sloshing excitation was arranged consistently. The dependency of the inlet velocity and tank geometry was revealed using Sty. A sloshing mode shift or a jet mode (stage) transition was evaluated to give rise to, with varying the inlet jet velocity. Consequently, a feedback mechanism was considered to be validated, which was closed by the jet fluctuation and the sloshing motion. The overall physical oscillation mechanism of the self induced sloshing was clarified.
社団法人日本機械学会の論文
1999-07-25