When a high-speed projectile penetrates into water, a cavity is formed behind the projectile. The gas enclosed in the cavity experiences a nonequilibrium process, i.e., the gas pressure decreases as the projectile moves more deeply into water. As a result, the cavity is sealed near the free surface (surface closure) and subsequently the cavity breaks up in water (deep closure). Accompanying the break-up of the cavity, secondary shock waves appear. This is the so-called supercavitation in water entry. This paper describes an experimental investigation into the water entry phenomenon. Projectiles of 342 m/s were generated from a small-bore rifle that was fixed vertically in the experimental facility. The projectiles were fired into a windowed water tank. A shadowgraph optical observation was performed to observe the entry process of the projectile and the formation and collapse of the cavity behind the projectile. A number of interesting observations relating to the motion of the free surface, the splash, the underwater bubbly flow and so on were found.
Optical observation of the supercavitation induced by high-speed water entry
Optische Aufzeichnung der durch den Wassereintritt eines Projektils erzeugten Superkavitation
Transactions of the ASME, Series I. Journal of Fluids Engineering ; 122 , 4 ; 806-810
2000
5 Seiten, 4 Bilder, 17 Quellen
Article (Journal)
English
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