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Proceedings Paper

Holographic interferometry on DDT induced by microfragments
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Paper Abstract

Previous studies on deflagration-to-detonation transition (DDT) have been carried out in detonation tubes, where the role of the solid wall of the tube is important. It is necessary to eliminate the wall effect for the investigation of three-dimensional DDT. Small explosive charges with charge masses of a few milligrams are useful for ignition purposes to generate spherical shock waves without wall effects. However, it was observed in our experiments that the shape of the shock waves is not always spherical. In a detonable mixture, the shape of the wave fronts often has many conical shock protrusions behind which the main wave front expands more rapidly. The conical waves are generated by fragments, which penetrate the main spherical shock wave. Regions of high turbulence are built up behind the fragments. From the results it can be inferred that DDT occurs in these turbulence regions, inducing locally a higher velocity of the following portion of the main wave front. In this study, we conducted tests of spherical detonation waves to investigate three- dimensional DDT. Time-resolved shadowgraphs and holographic interferograms were taken for visualization.

Paper Details

Date Published: 17 April 2001
PDF: 11 pages
Proc. SPIE 4183, 24th International Congress on High-Speed Photography and Photonics, (17 April 2001); doi: 10.1117/12.424346
Show Author Affiliations
Makoto Komatsu, Tohoku Univ. (Japan)
Kazuyoshi Takayama, Tohoku Univ. (Japan)

Published in SPIE Proceedings Vol. 4183:
24th International Congress on High-Speed Photography and Photonics
Kazuyoshi Takayama; Tsutomo Saito; Harald Kleine; Eugene V. Timofeev, Editor(s)

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