停止運動に及ぼすHighly Skewed Propellerの特性について

概要

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Highly skewed propellers (HSP) produce less noise compared to conventional propellers (CP) and are often used for passenger ships, container ships, PCCs, research ships and training ships. However, it is pointed out that HSPs lead to poor stopping performance especially at slow speed. This paper describes the results of the model tests and simulation studies that aimed at investigating the characteristics of the stopping motion of a ship with a single HSP and a single rudder. Many simulations of stopping maneuver were conducted for various J_<S0>(=U_0/(n・D)) in order to compare the stopping ability between HSP ships and that of ships with a CP. It was found that the stopping distance of an HSP ship is longer than that of a CP ship and that the turning motion of the former ship becomes a little bigger than that of the latter ship. Model test data indicated that the braking power of a HSP is smaller than that of a CP and the lateral force and the yaw moment of a HSP exerted by a propeller reversing are bigger than that of a CP. Based on the results of the simulation study, the authors propose that HSP ships should keep a minimum steerage way for the effective stopping maneuver and also apply a little higher reversing power than in the case of CP ships.
社団法人日本航海学会の論文
2007-09-25