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High-speed photography of supercavitation and multiphase flows in water entry

By H. Shi and M. Itoh


The supercavitation in water entry and associated multiphase flows were studied using a high-speed camera and single-shot optical device. The formation, growth and collapse of supercavities induced by underwater high-speed projectiles were revealed. The unsteady fluid dynamic processes of the splash, surface deformation, supercavity twisting, down jet in the cavity, etc. were also studied. Both axisymmetrical and three-dimensional supercavities were found in the experiment. The shape of the axisymmetrical supercavity has been comparied with Logvinovich s model. The three-dimensional supercavity is caused by the trajectory deflection of the underwater projectile, which is also related unsteadiness and turbulence of the flow field. When the supercavity is twisted, a grain-like cavitating bubble is formed after the upper and lower pinch-offs. It is newly found that during the surface closure (surface seal), the down-jet is generated simultaneously with the formation of upwards splash dome

Year: 2009
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