単純化モデルによる船尾縦渦の可視化

Abstract

An ordinary full ship generates at the stern a pair of large longitudinal vorticies, called bilge vorticies. In order to make clear the generation mechanism of the bilge vorticies, flow fields were visualized around systematically simplified ship stern models in IHI circulating water channel. The hydrogen bubble method and the dye tracer method were used for the visualization. The experi-mental results suggest that the bilge vorticies are generated by the similar mechanism as longitudinal vorticies generated at tips of reversed delta-wings, although bilge vorticies are distored and weakened in boundary layers and wakes of the ship.