実船実験によるマイクロバブルの観察

概要

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It has been shown from many experiments in the circulating water channel and towing tank that microbubble flow in the vicinity of the wall reduces skin friction considerably. Therefore, the microbubble flow is expected to be one of promising methods for reducing the ship frictional resistance. However, almost experiments have been conducted for channel walls and/or flat plates rather than ship models because it is difficult to satisfy the similarity law on the behavior of microbubbles in the ship model experiments. In the present study, an observation of microbubble flow has been made for a full-scale ship "NANSEI-MARU" which is a training ship of Kagoshima University. In order to generate microbubbles, air is ejected from many small holes on bendable pipes, of which section is like a saddle shape. The bendable pipes are fitted horizontally on the port side hull at bow and another bendable pipe along the girth of SS.8 at the starboard bottom. It was observed by underwater video camera that microbubbles flow along the bottom surface from bow until at least SS.3, with increasing the thickness of the mixing layer of microbubbles.
社団法人日本船舶海洋工学会の論文
2001-08-31