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Cinematographic investigations of the explosively driven dispersion and ignition of solid particles

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Abstract

We present results of an experimental study of blast wave propagation and particle dispersion induced by a free-field detonation of spherical charges made of a 125 g C-4 explosive surrounded by inert or reactive particles. Visualization of the flow was performed with a high-frame-rate video camera. Background oriented Schlieren (BOS) methods were adapted to process the images that allowed the detection of the shock waves. BOS analysis also revealed that particles form agglomerates, which may generate precursor perturbations on the recorded pressure signals. While inert glass particles notably delay the shock, the combustion of aluminium particles can accelerate it, especially if they are small atomized or flaked particles. When a mixture of inert glass particles with reactive particles is dispersed, the agglomerates are formed by coalescence of both materials.

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Authors and Affiliations

  1. Institut Pprime, UPR3346 CNRS, ENSMA, 1 Avenue Clément Ader, BP 40109, 86961 , Futuroscope Cedex, France

    Y. Grégoire, B. A. Khasainov & B. Veyssière

  2. French German Research Institute of Saint Louis, 5 rue du Général Cassagnou, BP 70034, 68301 , Saint Louis Cedex, France

    M.-O. Sturtzer

Authors
  1. Y. Grégoire
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  2. M.-O. Sturtzer
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  3. B. A. Khasainov
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  4. B. Veyssière
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Corresponding author

Correspondence to B. Veyssière.

Additional information

Communicated by H. Kleine.

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Grégoire, Y., Sturtzer, MO., Khasainov, B.A. et al. Cinematographic investigations of the explosively driven dispersion and ignition of solid particles. Shock Waves 24, 393–402 (2014). https://doi.org/10.1007/s00193-014-0500-0

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  • DOI: https://doi.org/10.1007/s00193-014-0500-0

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