Study of vapor-gas bubble motion inside a supercavity

The supercavities were studied in a slit channel with a hydrofoil inside. The hydrofoil attack angle was 21°. The dynamics of tracing flat cavitation bubbles in a slit channel were studied using a high-speed visualization with algorithmic diagnostics method. The methods of an algorithmic diagnostics of a two-phase flow were used to detect the size of bubbles, their velocity, direction of bubbles movement and spatial distribution. There are three types of supercavity patterns arising in slit channels: a transparent pulsating cavity with periodic vortex formation at the site of its closure; a steam and a steam-water mixture coexisting inside the cavity; a cavity completely filled with liquid with tracing vapor-gas bubbles inside. It is determined that the bubbles move inside supercavity from its boundaries to the center; further they move to the front of the cavity and merge with it. The maximum velocity of bubbles is half the velocity of the oncoming flow.