Combustion and Detonation Waves in Gas Mixtures of CH4/Air, CH4/O2, and O2/Coal Dust

Abstract

The combustion, explosion, and detonation in hybrid systems containing gas mixtures of CH4/air, CH4/O2, and O2/coal particles up to 200 $$\mu$$ m in size with a volume-averaged density of up to 700 g/m3 were studied on a vertical shock tube. X-ray diffraction patterns of the initial coal powder and coal samples subjected to high-temperature waves were analyzed. Data were obtained on the structure and parameters of waves in hybrid mixtures and in the same gas mixtures without coal dust. It is shown that in hybrid systems, coal dust has a weaker influence on the parameters of combustion and detonation waves than methane and that methane in these waves is more reactive than coal dust.