Explosion limits of H2/CH4/O2 mixtures: Analyticity and dominant kinetics

The pressure-temperature explosion limits of H2/CH4/O2 mixtures were analyzed computationally and analytically. It is shown that, with the addition of around 5% of H2 to the mixture, the explosion limit evolves from being monotonic to the non-monotonic Z-shaped response characteristic of H2/O2 explosions. Such transition is much less sensitive compared to the H2/CO/O2 system, and is explained by the different responses of the kinetic parameters...