ANALYSIS OF STABILITY OF DETONATION WAVE IN EMULSION EXPLOSIVE SENSITIZED BY GAS POCKETS (BUBBLES)

It is shown that when a detonation wave propagates in emulsion explosives (EE) sensitized by gas pockets, it is possible that detonation may cause disturbances on the wave surface, which exponentially die with time or remain stable (neutral stability state).
In the first case, this is the mode of stationary detonation with a plane front described by 1D Zeldovich-von Neumann-Döring model.
However, actual blasting using wet EE sensitized by gas pockets nearly all the time faces a bias from the conditions of EE uniformity and, accordingly, from stationarity of detonation.
The second case mode is cellular detonation. This mode makes it possible to increase energy density in the zone of reaction (as against the detonation with the plane front), which shortens the time of chemical reactions and, consequently, elevates stability of detonation.
For this reason, this mode is most preferable when EE are used. On the other hand, when a detonation wave propagates under this mode in the direction of an increase in the size of gas pockets (bottom-up when charges are initiated from below), a malbalance in the overall energy of explosion products is possible in the zone of chemical reaction: too much quantity of internal energy converts to kinetic energy of explosive gases. The shock wave front gets off the gas zone of reaction. Concurrently, due to insufficient heat energy, the pressure and temperature of explosive gases lower. This decelerates chemical reaction, which results in the jump increase in the critical diameter. As a consequence, the detonation velocity rapidly decreases up to complete termination of the detonation process.
The research findings enable making practically useful decisions toward reliable detonation of borehole charges.

Keywords

Emulsion explosive, detonation stability, cellular structure of detonation front.

Issue number: 5
Year: 2017
ISBN:
UDK: 622.235
DOI:
Authors: Gorinov S. A., Maslov I. Yu.

About authors: Gorinov S.A., Candidate of Technical Sciences, e-mail: akaz2006@yandex.ru, Maslov I.Yu., Candidate of Technical Sciences, e-mail: ilmaslov@mail.ru, Global Mining Explosive Group, 117036, Moscow, Russia.

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