波に向って進む浮体 : 波浪推進器の可能性について

概要

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Potential theory always gives a mean wave force acting on the ship or floating structure only in the direction of wave propagation and they actually drift with waves. The report represents the results of a model test which moves toward the waves by itself without any propelling power or control systems. This is a wave devouring propulsion model which converts the wave energy to the thrust and drives itself if any in the direction opposite to wave propagation. The model consists of the deck, wings (fore and aft) and side plates. Side plates support the deck and wings like a figure of "H". The upper deck surface coincides with the water surface. If the model situated in the waves, on the upper deck surface wave breaking occurs and momentum flux is induced in the incident waves and transmitted waves, so it makes thrust to the waves. Moreover a wing moving forward locating in the oncoming waves, wave orbital velocity acts such as perturbation velocity to the wing and generates the thrust. From tank test, it is shown that the speed of this model toward the waves amounts to 24 cm/sec. under some condition. By the model length Froude number, this speed is correspond to Fn=0.129.
社団法人日本船舶海洋工学会の論文
1982-03-30