Research on ventilation and supercavitation mechanism of high-speed surface-piercing hydrofoil

Flow structures and hydrodynamic performance of high-speed surface-piercing hydrofoils were studied by numerical simulation, with an emphasis on the interaction mechanism between supercavitation natural ventilation. Compared available experimental data, method could predict cavitation ventilation well. The simulation results show that flow over hydrofoil blunt trailing edge is more conducive to separating. semi-ogive was used explore influence angles attack cavitation. rate increases increase in attack. At small (α = 0° 2°), regional ventilated found supercavitation. vortex street twin vortices closure mode are formed region supercavity. moderate 6° 10°), thickness undisturbed liquid sheet (δ) becomes thinner transits fully through cavitation-induced ventilation, but position different because Taylor instability. coefficients remain relatively stable lift coefficient reduce half original value when ventilated, which caused pressure changes suction surfaces.