Stern flow control by use of bilge rotors

概要

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To control flow around full ship stern with bilge vortices, a pair of rotors was installed with their axes along the waterline of bilge parts of stern, and flow visualization tests, wake measurements in the propeller plane, resistance tests and self-propulsion tests were carried out. As a result, it was found that flow field around the stern was changed considerably by use of the bilge rotors. Further it was found that the bilge rotors were effective in reducing the resistance of ship model. The reduction of form factor was more than ten percent. On the other hand, effective wake fraction coefficient decreased as the revolution of rotors increased, and thrust deduction factor increased with the increase of revolution of rotors. As a result, improvement of propulsive performance was not found by use of the present bilge rotors. Further investigations are required to control flow field around full stern from the view point of propeller vibratory forces and improvement of the propulsive performance of ship.
社団法人日本船舶海洋工学会の論文
1985-03-22