| 摘要 |
PROBLEM TO BE SOLVED: To convert the energy of a bilge voltex flow into a propelling force and to reduce ship resistance by attaching fins, one each, to the hull surface of left and right gunwales in the front side of a propeller providing the wing root part of the fin on the hull surface and positioning this substantially in the center of the bilge voltex. SOLUTION: Fins 8 are attached to the surface of a hull 1, one for each, of left and right gunwales in the front side of a propeller 3 and the wing root part 8c of the fin 8 is attached such that a fin wing end part 8b is positioned in a snail center 6 position in which the bilge voltex 7 is passed through the fin 8 position. The camver 8a of the fin 8 is attached facing downward, a flow is generated so as to flow to the upper surface 8d and the lower surface 8e of the fin 8m, that is, negative pressure surface sides and a wing end voltex 11 rotated in a direction reverse to the direction of the bilge voltex 7 flowing out from the fin wing end part 8b to a downstream side is formed. Thus, the energy of a rotational flow caused by the bilge voltex 7 of a stern is converted into a propelling force and thus ship resistance is reduced. |
