Abstract
With the aim of optimizing performance of a hydrofoil bubble introducer for drag reduction of ship, the flows and free surface deformation around a hydrofoil were investigated experimentally in a wide range of Reynolds number, Froude number, gap ratio (normalized depth), and angle of attack. Image processing for the obtained images of flows and free surface elucidated the key factor of the free surface deformation and the conditions of flow separation on hydrofoils. Flow fields around the hydrofoil determined by PTV represent influence of the free surface with large deformation on the flow field quantitatively. These results provide fruitful information for the optimization of this hydrofoil facility.
