Experimental and Numerical Investigation of Ignition of Ammonia–Hydrocarbon Mixtures in Shock Tube Conditions

Abstract— The article is devoted to the experimental measurement of ignition delay times of ammonia with additives of CH4, C2H2, C2H4, and C2H6 behind shock waves and their comparison with the results of numerical simulation using modern kinetic models. A significant discrepancy between the predictions of kinetic mechanisms and the experimental data is demonstrated. The analysis of the sensitivity of the ignition delay time to the rate constants of individual reactions indicates the key role of insufficiently studied reactions of interaction of HO2 and NH2 radicals, as well as reactions involving N2Hx compounds, in the ignition of ammonia at elevated temperatures.