船舶摩擦抵抗低減のための翼型気泡発生装置に関する研究(<特集>第14回動力・エネルギー技術シンポジウム)

概要

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Installation of hydrofoils to ship wetted surface enables bubble generation to be realized with power consumption much lower than conventional bubble generators. With help of this principle, net effect of frictional drag reduction for ships can be improved. We have already obtained around 10% net power-saving efficiency for a cargo ferry throughout about half a year. The power-saving has a large potential to be improved more by considering multiphase fluid dynamics in terms of the hydrofoil-water-air triple interaction. This paper presents the principle of the bubble generation, the estimation of net power-saving, and the flow structure visualized by experimental and numerical approaches.
2010-03-25