The impact of H2 and O2 enrichment on the laminar combustion characteristics of biomass syngas flame

Abstract

This article investigates the impact of H2 and O2 enrichment on the laminar burning velocity (SL) of syngas in a constant-volume combustion chamber. By analyzing changes in both chemical and thermal effects, it examines the impact of variations in H2 and O2 content on the SL independently. Furthermore, this article investigates the pressure variations of spherical expanding flames, flame instability, and the formation of mixed fuel NO. Results show increased H2 and O2 content enhance SL, with O2 addition leading to a linear increase. H2 affects thermal-diffusive instability differently in lean and rich fuel regions, while increasing O2 content mitigates it. The synergistic influence of flame thickness and thermal expansion ratio amplifies fluid dynamic instability with higher H2 and O2 content. O2 addition is more effective in promoting the rate of production for thermal NO and H2 addition is more effective in promoting the rate of production for non-thermal NO.