Temperature Dependence of H 2 /Air and CH 4 /Air Deflagrations

This study presents a detailed analysis of the combustion dynamics of stoichiometric H 2 –air and CH 4 –air mixtures in a 20 L closed vessel over an initial temperature range of 298–423 K. We integrate experimental pressure–time P(t) measurements with numerical analysis to extract laminar burning velocity (LBV) and deflagration index (K G ) values, and we assess three independent kinetic mechanisms (KiBo_MU, University of San Diego, Lund University) via simulations. For H 2 –air, LBV increases from 0.50 m/s at 298 K to 0.94 m/s at 423 K (temperature exponent α ≈ 1.79), while for CH 4 –air, LBV rises from 0.36 m/s to 0.96 m/s (α ≈ 2.82). In contrast, the deflagration index K G decreases by ca. 20% for H 2 –air and ca. 30% for CH 4 –air over the same temperature span. The maximum explosion pressure (P max ) and peak pressure rise rate ((dP/dt) max ) also exhibit systematic increases with temperature. A comparison with model predictions shows agreement within experiments, providing data for safety modeling and kinetic mechanism validation in H 2 - and CH 4 -based energy systems.