弾性部を有する振動翼による推進に関する研究(第2報) : 特異点分布法による数値シミュレーションと実船への適用の可能性

概要

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In a previous paper, the authors analyzed partially elastic oscillating foils by a linearized theory and idenfied its various characteristics. In this paper, the authors propose here a nonlinear theory using singularity distribution method. In this theory, Hess & Smith's method is extended in order to treat unsteady foil motion and wake distortion is taken into account by discrete vortices. In the case of partially elastic oscillating foil, the solution is obtained by satisfying also the equation of motion which can be derived from the equation of elastic curve. The results obtained by the present theory was found to be in good agreement with experimental ones using a large amplitude rigid oscillating foil. From this fact, it can be said that this calculation method is effective for quantitative analyses of oscillating foil propulsors. Some simple oscillating foil propulsors were designed for practical application to ships. The results showed that adequate thrust force can be achieved and efficiencies as high as 65% can be envisaged in case of elastic foils.
社団法人日本船舶海洋工学会の論文