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Mach stem evolution in a confined multi-room

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Abstract

It is well established that detonation in a confined environment can lead to the formation of a Mach stem along the walls or after diffraction on an obstacle. As the formation of this kind of reflection can produce higher levels of overpressure, it is important to study and understand its formation and propagation for safety purposes in the event of an accidental or intentional detonation. This paper reports an experimental approach to the propagation of a Mach stem formed by the diffraction of a shock wave around an obstacle and compares the height of the triple point with an empirical model from Kinney and Graham. In predictive models, the Mach stem is formed by a charge detonating above the ground, which is why its evolution is different from a Mach stem formed after diffraction. The shock waves were generated by the detonation of a stoichiometric hemispherical charge of propane-oxygen. The visualization was coupled with 30 pressure sensors to record pressure history data in order to determine the influence of the Mach stem on wall overpressure inside a small-scale model, representing two rooms in a building separated by an open door.

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Acknowledgements

This work was funded by DGA Techniques Navales under contract No. 15-86-0027.

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Authors and Affiliations

  1. PRISME EA 4229, INSA Centre Val de Loire, Bourges, France

    G. Ruscade & I. Sochet

  2. DGA Techniques Navales, Toulon, France

    K. Djafer

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  1. G. Ruscade
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  2. I. Sochet
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  3. K. Djafer
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Correspondence to I. Sochet.

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Communicated by M. Hargather.

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Ruscade, G., Sochet, I. & Djafer, K. Mach stem evolution in a confined multi-room. Shock Waves 32, 395–404 (2022). https://doi.org/10.1007/s00193-022-01083-5

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