ジェットフラッタ : 液面に衝突する上向き平面噴流の自励振動

概要

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An upward plane jet, impinging on the free surface of water in a rectangular tank, oscillated Without external oscillation force. The occurrence condition and frequency of this oscillation which we called "jet-flutter" depended on the distance from the jet inlet to the free surface and the jet inlet velocity. We performed experiments varying several geometric conditions of the jet : thickness of the jet, height of inlet from tank bottom and the ratio of length of the jet inlet to the tank width. The dependence of occurrence condition and frequency varied widely with the ratio of length of the jet inlet to the tank width. In particular, when the ratio was 1, i.e., the tank was completely divided by the jet, the frequency corresponded to the natural frequency of the water column in a U-tube which had the same depth as the distance from the jet inlet to the free surface.
一般社団法人日本機械学会の論文
1995-02-25