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The flame propagation in nitrogen-diluted stoichiometric H2-O2 mixtures ([N2] = 10 – 60 vol%) was examined by the detailed chemical modelling of the isobaric deflagrations, at various initial pressures (1–10 bar). The modelling delivered the laminar burning velocity u S and the temperature, volumetric heat release rate and species concentration profiles across the flame front, discussed in correlation with the initial composition and pressure of gaseous mixtures. For each mixture composition an empirical power law was used to examine the dependence of the laminar burning velocity on pressure, for a restricted range of pressure variation. The correlations found between the burning velocity and the mass fractions of reactive species in the flame front were discussed in connection with the non-monotonous u S vs p dependence. The overall activation parameters (reaction order and activation energy) of H2-O2 reaction in flames were determined from burning velocities dependencies on pressure and on average flame temperature. 0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 100 150 200 250 300 350 400 450

Numerical study of pressure and composition influence on laminar flame propagation in nitrogen-diluted H2-O2 mixtures