Visualizations of underwater shock waves obtained by high efficient explosives

Shigeru Itoh; Akio Kira; Shirou Nagano; Masahiro Fujita

doi:10.1117/12.209546

30 May 1995 Visualizations of underwater shock waves obtained by high efficient explosives

Shigeru Itoh, Akio Kira, Shirou Nagano, Masahiro Fujita

Proceedings Volume 2513, 21st International Congress on: High-Speed Photography and Photonics; (1995) https://doi.org/10.1117/12.209546
Event: High-Speed Photography and Photonics: 21st International Congress, 1994, Taejon, Korea, Republic of

Abstract

When an explosive detonates in water, it is well known that an underwater shock wave occurs immediately and propagates into the water. Generally speaking, the explosion phenomena near the explosives are too complex for us to understand the shock generating mechanism. Although the characteristics of underwater shock waves far from the explosives have already been investigated by many researchers, the behavior near the explosives has not yet been sufficiently investigated. We have been approaching the metal processing using the underwater shock waves. In this approach, we used the underwater shock waves which were caused in the region close to the explosive. Therefore it is very important to know how the generation and the propagation of the underwater shock waves occurred by the underwater explosion of the explosive. Once the explosives detonate in water, the pressure just behind the detonation wave rises abruptly up to its Chapman-Jougel value. The pressure of the water adjacent to the explosives also immediately rises to its suitable pressure value. The phenomena near the explosives were unsteady, so we used an optical technique to determine their characteristics. We also used a numerical procedure to obtain their characteristics more precisely. Two kinds of explosives were used in experiments. One was a detonating cord and the other a plastic explosive called SEP. The characteristics of underwater shock waves were investigated by shadow graphs and streak photographs. We used a couple Lagrangian-Eulerian method in calculations.

Citation Download Citation

Shigeru Itoh, Akio Kira, Shirou Nagano, and Masahiro Fujita "Visualizations of underwater shock waves obtained by high efficient explosives", Proc. SPIE 2513, 21st International Congress on: High-Speed Photography and Photonics, (30 May 1995); https://doi.org/10.1117/12.209546

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KEYWORDS

Explosives

Photography

Wave propagation

Polymethylmethacrylate

Cameras

High speed photography

Velocity measurements

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