Investigation of detonation properties of tetranitromethane/methanol mixture

摘要

In this work, the influence of methanol (M) on the detonation parameters, reaction zone structure and detonation front stability of tetranitromethane (TNM) was studied. The experiments were performed by a V1SAR interferometer. The dependence of detonation velocity of the TNMIM mixture on methanol concentration is non-monotonically - the highest detonation velocity is observed at a small negative oxygen balance (26-28% of methanol). The thermodynamic calculation with the BKW-RR equation of state agrees well with the experimental data and reproduces the discrepancy between the maximum detonation velocity and the stoichiometric concentration of the mixture. At the near stoichiometric concentration of methanol, the amplitude of Von Neumann spike decreases significantly, whereas the detonation parameters increase. The instability of detonation waves in the TNMIM mixture was shown, both with respect to one-dimensional longitudinal perturbations and to the curvature of the front leading to the formation of the cellular structure.