Optical Observation of The Supercavitation Induced By High-Speed Water Entry  

Oleh:

Takami, Takuya ; Shi, Hong-Hui ; Itoh, Motoyuki

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Fluids Engineering vol. 122 no. 4 (2000), page 806-810.
Topik: OPTICAL COMMUNICATIONS; optical observation; supercavitation; high - speed; water entry

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ89.2 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

When a high - speed projectile penetrates into water, a cavity is formed behind the projectile. The gas enclosed in the cavity experiences a non equilibrium 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.

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