engleski

Calibration of pressure-based reaction rate law used for numerical modelling of non-ideal ANFO explosives

Commercial explosives based on ammonium nitrate, such as ANFO, are widely used in the mining industry and are classical examples of non-ideal high explosives. Detonation of such explosives is characterized by a strong dependence of detonation parameters on charge diameter, density of explosives, presence and characteristics of confinement, as well as incomplete consumption of explosive at the sonic point. For numerical modelling of detonation of ANFO explosive, we used a non-ideal detonation model based on Wood- Kirkwood detonation theory [1] coupled with thermochemical code EXPLO5, supplemented with reaction rate law, radial expansion of detonation products and equations of state of unreacted explosive and detonation products [2]. In this work we have calibrated kinetic parameters in single-step pressure-based reaction rate model, based on experimental detonation velocity data measured on a range of explosive charge radii. It was shown that single-step pressure-based reaction rate model, with pressure exponent 1, 3 the best reproduces experimental detonation velocity-charge radius curve. Thus calibrated reaction rate law may be used to predict temporal and spatial distribution of flow parameters in the chemical reaction zone, which contributes better understanding of processes occurring in the reaction zone.

Pressure-based reaction rate law ; numerical modeling ; nonideal detonation ; ANFO

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