Cavitating hydrofoil with a structural surface

Abstract

A study of cavitating smooth hydrofoil and foil with a structural surface was carried out. The structural surface morphology was made by laser ablation technology with a step of 0.01 mm and wavelength of 1064 nm. High-speed visualization of cavitating hydrofoils at various of flow bulk velocity was performed. In the paper is presented a comparison of cavitation flow regimes for the smooth and the roughness hydrofoils at equal cavitation numbers. The maximal lengths of the attached cavities for different flow regimes are compared. The structural surface of hydrofoil allows delaying the nucleation of cavitation and reducing the attached cavity size at higher velocities of the incoming flow was obtained.