短波長正面規則波中の船の推進性能算定法

概要

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This paper presents a method to calculate the propulsive performance of ship advancing in regular head waves with short wavelength. In this formulation, we assumed that the ship motion was neglected because the wavelength is small compared with ship length. By distributing the double-body source and unsteady source on the hull surface and the steady and the unsteady circulation on the propeller plane. we express the flow field around the hull and the propeller. As to the added resistance due to bow diffraction, we adopt Faltinsen's formula. From the boundary conditions on the hull surface and the propeller plane, we obtain the singularity distributions. Then, by using these singularities, we calculate the interaction forces and the thrust and the torque of the propeller. After attaining the self-propulsion condition, the propulsion factors are obtained by the thrust-identity method. As a numerical example, we apply this method to three mathematical hull forms with different waterlines and section shapes. When these ships advance in regular head waves with short wavelength (λ/L=0.2〜0.6), we show that the propulsive performances of ships decrease with increase of wavelength and wave height.
社団法人日本船舶海洋工学会の論文
1999-09-04