推進性能に及ぼす舵の影響

概要

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In the previous papers, the propulsive performance and its scale effect of a full ship, which consists of an actual hull form and an infinitely bladed propeller, were calculated theoretically by utilizing the measured hull resistance and the wake data for a geosim model. In this paper, it is investigated that the effect of a streamline rudder on the propulsive performance of the full ship. The rudder is considered to be a rectangular wing with thickness. The load distribution on the rudder is represented by vortex systems and rudder thickness is expressed by doublet distribution. The rudder plane is divided into a lot of small rectangles, on which the load distribution is assumed to be constant in the spanwise direction of each rectangle. Then the mutual interactions of the hull, the propeller and the rudder are elucidated. Following conclusions may be drawn from the calculated results: (i) In case of a ship with a single screw and a single rudder, a rudder has a considerable effect on the propulsive performance. (ii) Thinner rudder is more favorable to the propulsive performance. (iii) When the area of a rudder plane is constant, a rudder of higher aspect ratio is recommended. (iv) The screw propeller which has larger effective pitch ratio attains higher propulsive efficiency.
社団法人日本船舶海洋工学会の論文
1978-03-15