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Combustion, Explosion and Shock Waves

2016 year, number 2

Stabilization of Unstable Detonation Waves in Mixtures of Nitromethane with Inert Diluents

V. M. Mochalova1,2, A. V. Utkin1,2
1Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, 142432 Russia
2Tomsk State University, Tomsk, 634050 Russia
Keywords: детонация, неустойчивость детонационного фронта, стабилизация детонационных волн, нитрометан, диэтилентриамин, смесь нитрометан/диэтилентриамин, нитрометан/ацетон, нитрометан/метанол, detonation, instability of detonation front, stabilization of detonation waves, nitromethane, diethylene triamine, nitromethane/diethylenetriamine mixture, nitromethane/acetone, nitromethane/methanol

Abstract

Mass velocity profiles of detonation waves in mixtures of nitromethane with acetone and methanol with added diethylenetriamine sensitizer were measured using a VISAR laser interferometer. It was found that even small, about 1%, concentrations of acetone and methanol, inert diluents, led to instability of the one-dimensional detonation front in nitromethane. The results of the experiment show that the use of the sensitizer is an effective method of flow stabilization and if the concentration of the inert diluent does not exceed 10%, the detonation front becomes stable with the addition of 1% diethylenetriamine. At a higher diluent concentration, the sensitizer does not suppress the instability but decreases the oscillation amplitude by several times. The addition of diethylenetriamine to the mixture has been found to increase the detonation velocity.