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

Rafał Porowski, Gianmaria Pio, Fekadu Mosisa Wako, Robert Kowalik, Tomasz Gorzelnik, Vojtěch Jankůj and Ernesto Salzano ()
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Rafał Porowski: Institute of Physics, Jan Kochanowski University of Kielce, 25-369 Kielce, Poland
Gianmaria Pio: Department of Civil, Chemical, Environmental and Materials Engineering, Università di Bologna, 40131 Bologna, Italy
Fekadu Mosisa Wako: Department of Civil, Chemical, Environmental and Materials Engineering, Università di Bologna, 40131 Bologna, Italy
Robert Kowalik: Faculty of Environmental Engineering, Kielce University of Technology, 25-314 Kielce, Poland
Tomasz Gorzelnik: Faculty of Energy and Fuels, AGH University of Krakow, 30-059 Krakow, Poland
Vojtěch Jankůj: Faculty of Safety Engineering, Centre of Excellence for Safety Research, VSB-Technical University of Ostrava, 70030 Ostrava, Czech Republic
Ernesto Salzano: Department of Civil, Chemical, Environmental and Materials Engineering, Università di Bologna, 40131 Bologna, Italy

Energies, 2025, vol. 18, issue 15, 1-15

Abstract: 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.

Keywords: hydrogen; methane; laminar burning velocity; deflagration; kinetic modeling (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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