Comparative Analysis of Emissions and Flame Structures in Plasma-Assisted Ammonia and Ammonia/Hydrogen Flames

This work presents comprehensive emission measurements conducted in plasma-assisted ammonia-air and ammonia/hydrogen-air flames, as well as NH2*measurements in a model gas turbine combustor. The emission results indicate that plasma reduces total NOx emissions in NH3-air flames at ϕ<0.85 but exhibits the opposite effect in fuel-rich regions. For NH3/H2-air flames, plasma consistently increases NOx emissions. The N2O emissions reach a minimum near the stoichiometric value for both NH3-air and NH3/H2-air flames, and plasma consistently reduces N2O emissions. The NH2* results suggest that NH3/H2-air flames have a lower NH2* intensity, which could be attributed to the higher NOx emissions associated with their higher temperatures.