Study of cavitation bubble motion inside a supercavitation cavity
A.Yu. Kravtsova1,2, D.V. Litvinova1,2, D.F. Sikovsky2, S.G. Skripkin1,2
1Novosibirsk State University, Novosibirsk, Russia
2Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Keywords: cavitation, vapor-gas bubbles, supercavetation, high-speed visualization, algorithmic diagnostics
Abstract
The supercavitation cavities were studied in a slot channel with a wing-shaped body inside. The wing attack angle was 21°. The dynamics of tracing flat cavitation bubbles were studied using a high-speed camera. The methods of algorithmic diagnostics of two-phase flow were used to detect the size of bubbles, their velocity, direction of movement and spatial distribution. It is shown that there are three types of supercavitation cavities arising in slot channels: a transparent pulsating cavitation cavity with periodic vortex formation at the site of its closure; steam and a steam-water mixture coexisting inside the cavity; a cavity completely filled with liquid with tracing steam-gas bubbles inside. It is determined that the bubbles move into the supercavitation cavity 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.
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