Energy release of mixed explosives during propagation of a nonideal detonation under conditions similar to the operation conditions of a blasthole charge |
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Authors: | A V Anan’in A N Dremin C Cunnigham S A Koldunov B P Kryukov A V Lebedev Yu M Litvinov |
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Affiliation: | (1) Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, 142432;(2) African Explosives Ltd., Modderfontein, South Africa |
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Abstract: | Detonation experiments were performed in a specially developed explosive device simulating a blasthole using charges of fine-grained
and coarse-grained (granular) 30/70 TNT/ammonium nitrate mixtures of identical density 0.89 g/cm3 in steel shells with an inner diameter of 28 mm and a wall thickness of 3 mm at detonation velocities of 4.13 and 2.13 km/sec,
respectively. Despite significant differences in detonation velocity (pressure), identical expansion of the charge shells
was observed. On the other hand, numerical simulations of detonation propagation in the explosive device with the corresponding
velocities ignoring the possibility of energy release behind the shock front show that the expansion of the charge shell is
always greater in the case of a high-velocity regime. It is concluded that under the conditions simulating detonation propagation
and the work of explosion products in a blasthole, effective additional energy release occurs behind the low-velocity (nonideal)
detonation front.
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Translated from Fizika Goreniya i Vzryva, Vol. 43, No. 4, pp. 111–120, July–August, 2007. |
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Keywords: | mixed HEs granular structures nonideal detonation completeness of energy release shell expansion blasthole |
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