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Science and Technology of Energetic Materials

Vol.78, No.5 (2017)

Research paper

On the azimuth angle characteristics of the blast wave from an underground magazine model (III) - Experiments on the effect of the internal length-to-diameter ratio -
Yuta Sugiyama, Kunihiko Wakabayashi, Tomoharu Matsumura, and Yoshio Nakayama
p.117-123

Abstract

We conducted small-scale explosion experiments to assess the effect of the shape of an underground magazine both with and without a dike. The values of the internal length-to-diameter ratio L/D of the magazine model were 9 and 21, respectively, with the inner diameter fixed as 38.8 mm. The overpressures of the blast wave were measured using piezoelectric pressure sensors. A series of explosion experiments provided the azimuth angle characteristics of the peak overpressures of the blast wave from the exit. Increasing L/D led to a reduction in the peak overpressure. We discuss the applicability of an empirical formula proposed previously for L/D =3 but now for varying L/D , which implies that the azimuth angle characteristics depend only on properly referenced data such as the peak overpressure in the exit direction. This gives the peak-overpressure distribution around an underground magazine with 3 ≤ L/D 21.

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Keywords

small-scale experiment, blast wave, azimuth angle characteristics, underground magazine, magazine shape

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