부산대학교 도서관

This paper presents experimental data on the flame structure of laminar premixed ammonia and ammonia/hydrogen flames at different equivalence ratios (φ = 0.8, 1.0 and 1.2) and the laminar flame speed of ammonia/hydrogen flames (φ = 0.7–1.5) at 1 atm. Experimental data were compared with modeling results obtained using four detailed chemical-kinetic mechanisms of ammonia oxidation. In general, all models adequately predict the flame structure. However, for the laminar burning velocity, this is not so. The main nitrogen-containing species present in the post-flame zone in significant concentrations are N 2 and NO. Experimental data and numerical simulations show that the transition to slightly rich conditions enables to reduce NO concentration. Numerical simulation indicate that increasing the pressure rise also results into reduction of NO formation. However, when using ammonia as a fuel, additional technologies should be employed to reduce NO formation. [Display omitted] • Ammonia is a zero-carbon renewable carrier of hydrogen. • Structure and laminar flame speed of NH 3 /H 2 /O 2 /Ar(N 2) flames were measured at 1 atm. • Four chemical kinetic mechanisms of NH 3 /H 2 mixtures combustion were validated. • The main N-containing species of NH 3 combustion in post-flame are N 2 and NO. • The use of slightly rich NH 3 /H 2 /O 2 blends reduces NO formation. [ABSTRACT FROM AUTHOR]