離散渦法によるベックツイン舵に働く流体力に関する研究 : 二次元一様流中

概要

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Recent years, we have a great deal of ships that have VecTwin Rudder. VecTwin Rudder is provided by two rudders that can rotate in a 360-degree arc. The Rudder has eleven typical operation modes, 'Ahead, Hovering, Astern, Turn to Starboard or Port, Astern to Starboard or Port, Rotate to Starboard or Port, and Stern to Starboard or Port'. The operation modes can be done by keeping propeller rotating ahead. The Rudder is very convenient system for use, but the relation between the operation modes and a position of a ship's helm has not been known in detail. The hydrodynamic forces acting on the rudder are important to be understood in order to navigate VecTwin Ship safely. In this paper the author tries to calculate the hydrodynamic forces acting on the rudder in the large angle of incidence by vortex shedding method. The calculation results are reasonably compared with experimental ones, and demonstrate that the combination of larger inner and smaller outer rudder angle, that practically used, is more effective than the opposite combination for both turning and rotating operation modes.
社団法人日本船舶海洋工学会の論文
1999-09-25