Effect of the oxygen balance on ignition and detonation properties of liquid explosive mixtures

18th APS-SCCM; 24th AIRAPT

Genetier, M.^1 ; Osmont, A.^1 ; Baudin, G.^1

CEA, DAM, GRAMAT, Gramat

F-46500, France^1

关键词: Decomposition kinetics;    Detonation product;    Detonation properties;    Explosive mixtures;    High explosives;    Liquid mixture;    Secondary combustion;    Shock to detonation transitions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/19/192001/pdf
DOI  :  10.1088/1742-6596/500/19/192001

来源: IOP

【 摘 要 】

The objective is to compare the ignition and detonation properties of various liquid high explosives having negative up to positive oxygen balance (OB): nitromethane (OB0). The decomposition kinetic rates and the equations of state (EOS) for the liquid mixtures and detonation products (DP) are the input data for a detonation model. EOS are theoretically determined using the Woolfolk et al. universal liquid polar shock law and thermochemical computations for DP. The decomposition kinetic rate laws are determined to reproduce the shock to detonation transition for the mixtures submitted to planar plate impacts. Such a model is not sufficient to compute open field explosions. The aerial overpressure is well reproduced in the first few microseconds, however, after it becomes worse at large expansion of the fireball and the impulse is underestimated. The problem of the DP EOS alone is that it takes only the detonation into account, the secondary combustion DP-air is not considered. To solve this problem a secondary combustion model has been developed to take the OB effect into account. The detonation model has been validated on planar plate impact experiments. The secondary combustion parameters were deduced from thermochemical computations. The whole model has been used to predict the effects of the oxygen balance on open air blast effects of spherical charges.