Structure of detonation waves in mixtures of tetranitromethane with nitrobenzene and methanol

Experimental studies of the structure of detonation waves in mixtures of tetranitromethane with methanol and nitrobenzene have been performed. Mass velocity profiles at the arrival of detonation waves at the boundary with a water window were recorded by a laser interferometer. It has been shown that the flow pattern in the reaction zone changes sharply at a concentration of diluents in the vicinity of stoichiometry, resulting in a decrease in the amplitude of the Von Neumann spike up to its complete disappearance. The detonation waves are resistant to the formation of a cellular structure of the front over almost the entire concentration range, except in the range near the limit values. At the same time, the amplitude values of mass velocity are poorly reproduced from experiment to experiment performed under the same conditions. The obtained experimental dependences of the detonation velocity on the concentrations of methanol and nitrobenzene are in good agreement with the thermodynamic calculations performed.