Modeling of the Nonstationary Combustion Process of Methane-Air Mixture in Coal Mines

Simulation of the nonstationary combustion process for methane-air mixture in coal mines has been performed. Analytical dependencies are formulated to perform simulation of nonstationary combustion for methane-air mixture based on the FlowVision software package. The adequacy of the computer model was verified on the experimental data, given in the literature for 7 experiments, and on its own experimental data. The average relative error of the model is from 10 to 20%. The developed model is scaled for ducts with large diameters from 2 to 4 m. Model can be used to calculate non-stationary combustion for coal mine conditions. Modeling of nonstationary combustion for coal mine conditions was carried out. As result, it is established that for the considered configurations of the mines: maximum velocity of the flame front during detonation reaches 1400 m/s; maximum temperature in the calculated region during detonation is 2440 degrees C; maximum overpressure at detonation is 4 MPa; the calculated values of the radiation flux density at detonation reach 2200 kW/m(2).