A new publication by Professor Ossi Kaario and his team at Aalto University, Finland, reveals important findings on how ammonia-hydrogen-air flames behave near a wall surface. This work supports WP1 of the Hi-EFECTS project, which focuses on developing a fuel-adaptive compression ignition engine for alternative marine fuels.
By using detailed chemical simulations, the study explores how flame-wall interactions evolve with different ammonia-hydrogen blends. It finds that:
1. Increasing hydrogen content shortens the quenching distance but raises heat transfer to the wall.
2. Specific reactions such as NH₂ + NO → N₂ + H₂O—play a key role in NO and N₂O formation near the wall.
Radical recombination reactions significantly contribute to heat release, particularly at higher equivalence ratios.
These findings help improve combustion modeling and provide new insights for optimizing carbon-free fuels like ammonia and hydrogen in marine applications.
This is one of the first studies to numerically analyze side-wall quenching (SWQ) for ammonia-hydrogen mixtures, marking an important step in clean combustion research.