8 0 0 0 OA 船底の汚れに因る船體抵抗の増加
- 著者
- 出淵 巽 藤嶋 範平 荒木 勤 出淵 巽 山本 武藏 菅 四郎 湊 一磨 平賀 譲
- 出版者
- 公益社団法人日本船舶海洋工学会
- 雑誌
- 造船協會會報 (ISSN:05148499)
- 巻号頁・発行日
- no.55, pp.57-100, 1935-03-25
The effect of fouling upon the resistance of ships was examined by the towing experiments with the ex-destroyer Yudachi at various stages of fouled surface after 4,75,140,225 and 375 days out of dock ; the speeds experimented with were up to 20 knots at each fouled condition. After these experiments the author studied the effect of fouling on the propulsive efficiency applying the above-mentioned results of towing experiments to the trial results of a first-class destroyer. The chief conclusions drawn from these investigations are : (1) Frictional resistance of ships having fouled bottoms can be expressed by the following formula : -R_f=f S V^<2-1>, where R_f=frictional resistance in kg., S=wetted surface area in m^2., V=speed of ship in knots, f=coefficient of frictional resistance which varies with the weight of fouled substances per unit area as shown in Fig.6. (2) Propulsive efficiency is affected scarcely by the bottom fouling.
