A Relationship for Estimating the Ignition Delay of Hydrogen-Enriched Ammonia-Air Mixtures

Ammonia and hydrogen are two excellent solutions for decarbonization. Ammonia can be burnt as a neat fuel or in blends with hydrogen and can also be used as an energy carrier for hydrogen. In this paper, the authors used chemical kinetic mechanisms to evaluate the ignition delay of ammonia-hydrogen blends (from 10 to 50% of hydrogen by volume) using both tabulated data and a specific mathematical relationship. Using the Cantera environment, the method has been validated at first comparing the calculated data to the experimental ones. Then, the ignition delay has been calculated considering pressures from 10 to 130 bar and temperatures from 600 to 1200 K. The obtained correlation covers the whole range investigated with a mean deviation from the reference value within 5.7%.