非定常性を考慮したVibratory Propeller Shaft Forceの実用的な計算法 : 第一報基礎式の展開

概要

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In the recent research analizing propeller performance characteristics, great effort has been made to the unsteady effect of a wake. The author has investigated the method to evaluate the unsteady effect on the vibratory propeller shaft force for practical design purpose, which is outlined as follows. The circumferential fluctuations of thrust and torque are calculated by the quasi-steady analysis by using the propeller open water diagram, in which the axial and tangential wake components are taken into account. The circumferential fluctuation of thrust is transformed into the circulation fluctuation of the quasi-steady lifting line, when the assumed radial distribution of circulation is given as a function of radial coordinate except the strength of circulation. The quasi-steady lifting line is transformed into the quasi-steady lifting surface by introducing the assumed chordwise distribution of circulation. The circulation of the unsteady lifting surface is solved at one point under the condition that the downwash flow on the blade in the unsteady flow field is same to that in the quasi-steady flow field. Vibratory propeller shaft force is calculated from the circulation of the unsteady lifting surface. In order to confirm the propriety of this method, the unsteady effects on the thrust and torque fluctuations are investigated numerically.
社団法人日本船舶海洋工学会の論文
1977-08-15