Science and Technology of Energetic Materials

Vol.62, No.5 (2001)

Research paper

Propagation of blast waves initiated by a solid explosive in a cylinder
Yoshio Nakayama, Tomoharu Matsumura, Mitsuaki Iida,
and Masatake Yoshida


Blast wave characteristics for an open - ended vessel have been studied and discussed in numerous reports. Much less study has been given to the numerical methods and comparisons of the simulation results with the observed data.
This paper presents the results of an experimental and numerical study carried out to investigate blast wave propagation outside a cylindrical vessel (L≈ 1 m, L.D.≈ 0.2 m). Air blast pressure time histories were measured via pressure gauges, and four characteristic parameters of the air blast were evaluated. From the experimental results, the effects of azimuth angle on wave decay as a function of distance were investigated.
The simulation results of peak static over - pressure agreed fairy well with the experimental results for all charge masses.
The time - of - arrival (TOA) simulation results showed shock wave arrival earlier than experimental results. These time differences suggest a barrier effect attributable to the paper disks used for supporting the explosive.
The numerical results for time - of - duration(TOD) agreed qualitatively with the experimental results, however, for positive impulse, the simulaltion results predicted higher values than was obtained experinentally.
In order to obtain a better agreement between the numerical results and the experimental results, it is necessary to experimentally obtain the JWL parameters of detonation products for Pentolite.

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