To reduce viscous drag such as friction drag and pressure drag that a hull submerged part in contact with water receives from water when a sailing body, such as a ship and a submarine with a relatively slow ship speed and a large viscous drag, moves.SOLUTION: An eddy current generation is suppressed by rectifying a water flow at a stern of a sailing body 1 adopting a symmetrical wing shape such as NACA0020 or an approximate shape for a water line surface shape of a hull submerged part 2 of the sailing body 1, especially the water line surface shape on a stern side, and hereby the viscous drag due to the shape of the hull submerged part 2 is reduced.SELECTED DRAWING: Figure 1
【課題】比較的船速が遅く粘性抵抗の割合が大きい船舶や潜水艦などの航走体において、航走体が移動する際に水に接する船体没水部が水から受ける摩擦抵抗や圧力抵抗などの粘性抵抗を小さくする。【解決手段】航走体1の船体没水部2の水線面形状、特に船尾側の水線面形状にNACA0020等の対称翼の形状若しくは近似の形状を採用して、航走体1の船尾の水流を整流して渦流の発生を抑制し、これにより、船体没水部2の形状に起因する粘性抵抗を減少する。【選択図】図1
SAILING BODY AND VISCOUS DRAG REDUCTION METHOD OF SAILING BODY
航走体及び航走体の粘性抵抗低減方法
2023-05-16
Patent
Electronic Resource
Japanese
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