Abstract:

The ignition and growth process during methane -air mixture detonation in strong ignition system are the combination of a series of complex processes, including phase change, mixing, chemical reaction, the particles flashover and so on. In this paper, the horizontal multiphase combustion explosion pipelines and other systems are used to study the methane-air detonation under conditions of strong ignition. With the concentration of 2.5%, 4.13% and strong ignition, combustion and explosion waves are propagated in the methane-air mixture. With the concentration of 15.15% and strong ignition, combustion and explosion wave can also be propagated in the mixture. As to the limit concentration of methane, the optimal explosion concentration is between 9.13 and 10.92% which is very near to the optimal concentration of methane, about 10%, theoretically. And the theoretical and experimental explosion pressure results with different concentrations of methane may also prove it.

Key words: methane, multi-phase combustion and explosion, explosion pressure, explosion velocity