高圧空気を直接の駆動源とする船舶用推進ノズル内の流動現象に関する研究 : 水流速度の変化に伴うノズル内流れの変化に対する実験的考察(流体工学,流体機械)

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An experimental study by means of pressure measurements and flow visualization was performed to investigate unsteady flows inside a two-dimensional semi-open-type nozzle for a ship propulsion equipment directly driven by high-pressure gas. We found that ejected gas phase and water-flow phase are separated clearly of themselves, and the interface of these phase behave like interfacial waves. It is clarified by flow visualization with a high speed motion camera and a circulating water channel that these interfacial waves change their shapes according to water-flow velocity. The interfacial wavelength becomes longer in response to increasing water-flow velocity, and the mechanism that obtains thrust on the nozzle-wall changes. The thrust and flow patterns for the intermittent gas ejection according to water-flow velocity are also clarified.
社団法人日本機械学会の論文
2006-03-25