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17 April 2001 Holographic interferometry on DDT induced by microfragments
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Proceedings Volume 4183, 24th International Congress on High-Speed Photography and Photonics; (2001)
Event: 24th International Congress on High-Speed Photography and Photonics, 2000, Sendai, Japan
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.
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Makoto Komatsu and Kazuyoshi Takayama "Holographic interferometry on DDT induced by microfragments", Proc. SPIE 4183, 24th International Congress on High-Speed Photography and Photonics, (17 April 2001);

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