浮力制御方式バラストフリー船の船底開口部形状の設計に関する研究

概要

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Ballast water discharged at each port is accounted to help spreading marine organisms and to cause damage to the marine ecological system. At present, the International Maritime Organization is preparing to take effect International Convention for the control and management of ShipsBallast Water and Sediments, 2004 to solve this issue. Responding to the convention various type of ballast water treatment systems are under developing worldwide. The present ballast-free system is based on a completely different concept compared to those ballast water treatment systems. The present system utilizes the flow around a moving ship to generate water circulation inside the ships tanks. Thus the water inside the tanks is always exchanged with the sea water outside the ship to keep the contents of water inside the tank to be identical to those of the sea water outside the ship. In order to design suitable vent shapes that can generate effective water circulation in the tanks numerical simulations and model tests were carried out to analyze the flow around the vents and estimate the increase of the ship resistance.
社団法人　日本船舶海洋工学会の論文