Theoretical Model of Minimum Ignition Energy Prediction for Methane-Air Mixture

The minimum ignition energy is one of the important properties to estimate the fatalness of combustible gases. To get a theoretical value of minimum ignition, a physical model of spark ignition of the combustible gases was established, and a minimum ignition energy prediction method of combustible mixtures through a numerical analysis was given. The critical temperature and minimum ignition energy of methane-air mixture during spark ignition process were obtained. The results shows that MIE of methane-air has a U-shaped relationship to concentrations, and the MIE of premixed gas under concentration of 8.5% is 0.39 mJ, which agrees well with the experimental value.