The Combustion Characteristics of NH₃/H₂ Flames inside a Radial Porous Media Burner

This study investigates the stabilization of ammonia-hydrogen (NH₃/H₂) flames in porous media burners (PMB). A radial inward flow configuration was established to investigate flame propagation in different NH₃/H₂ mixtures. A spectrally-filtered infrared imaging technique was employed to determine solid-phase temperatures within the ceramic material. The solid phase temperature distribution Ts was estimated in the null spectral region for gaseous emissions, isolating only surface emission of the silicon carbide media, revealing key variations in lean and rich conditions. The exhaust gas temperature and solid-phase temperature measurements provided insights into the flame stabilization mechanism influenced by H₂ enrichment. The results demonstrate the effectiveness of cylindrical foam as a combustion medium, highlighting the effect NH₃/H₂ mixtures and the equivalence ratio on combustion behavior and flame stability. In addition, the emission of pollutant NO under lean conditions and unburnt reactants NH₃ and H₂ under rich conditions were analyzed.