PROBLEM TO BE SOLVED: To provide a stern shape having a stern duct which enhances propulsion efficiency by use of a flow below a propeller, and a marine vessel.SOLUTION: A stern shape comprising a propeller 20 which is provided at a stern of a hull 10, and a stern duct 30 which is attached to the front of the propeller 20, in which a duct body 31 of the stern duct 30 has a substantially 3/4 cylindrical shape, and a rear edge of the duct body 31 has a substantially 3/4 circular lower part or a straight part 32 connected to a substantially 3/4 circle at a lower center when forward viewed from the rear of the hull 10. A cross-sectional shape of the straight part 32 in the side view has an internally convexed profile such that a rear part thereof is inclined upward within a range of two degrees or more and 10 degrees or less with respect to a horizontal plane, and an internal radius r of the substantially 3/4 circle is so set to as to fall within 40% or more and 80% or less of a radius of the propeller 20.SELECTED DRAWING: Figure 2
【課題】プロペラ下部の流れを利用して推進効率を向上させる船尾ダクトを有した船尾形状及び船舶を提供すること。【解決手段】船体10の船尾に設けられたプロペラ20と、プロペラ20の前方に取り付けられた船尾ダクト30とを備え、船尾ダクト30のダクト本体31が略3/4円筒状を成し、船体10の後方から前方視した場合にダクト本体31の後縁が略3/4円の下部又は下方の中央に略3/4円と接続される直線部32を有した形状であり、直線部32の側面視した断面形状が水平面に対して後部が上方に2度以上10度以下の範囲で傾いた内側に凸の翼型を成し、かつ略3/4円の内半径rをプロペラ20の半径の40%以上80%以下の範囲に設定した。【選択図】図2
STERN SHAPE HAVING STERN DUCT AND MARINE VESSEL
船尾ダクトを有した船尾形状及び船舶
2017-11-24
Patent
Electronic Resource
Japanese
IPC: | B63H Schiffsantrieb oder Steuerung der Schiffe , MARINE PROPULSION OR STEERING |
STERN ADDITION, STERN SHAPE HAVING STERN ADDITION, AND VESSEL
European Patent Office | 2021
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