NUMERICAL STUDY OF PRESSURE AND COMPOSITION INFLUENCE ON LAMINAR FLAME PROPAGATION IN NITROGEN-DILUTED H2-O2 MIXTURES

The flame propagation in nitrogen-diluted stoichiometric H-2-O-2 mixtures ([N-2] = 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 S-u 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 uS vs p dependence. The overall activation parameters (reaction order and activation energy) of H-2-O-2 reaction in flames were determined from burning velocities dependencies on pressure and on average flame temperature.