What question did this study set out to answer?

The study aims to understand how pressure influences the stability and emissions of hydrogen-air flames in aviation applications.

Experimental Investigation of Pressure Influence On A Swirled Stabilized Premixed Hydrogen-Air Flame For Aeronautical Applications Using Optical Diagnostics

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Experimental trial investigates flame stability and NOx emissions in hydrogen combustion for aviation, suggesting gains in sustainability.

The study aims to understand how pressure influences the stability and emissions of hydrogen-air flames in aviation applications.
Tested novel premixed ultra-low NOx swirl-stabilized H2-air flame design on the ONERA MICADO test rig.
Explored various operating conditions up to 19 bar and global equivalence ratios between 0.2 and 0.3.
Characterized flame dynamics using OH* chemiluminescence imaging and OH-PLIF.
Achieved very low NOx levels across all operating conditions.
Identified flashback as a limitation for fully premixed conditions.
Pilot injection successfully extended the safe operation range without degrading emissions or efficiency.

Pilla et al. (2026) studied this question.

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Experimental trial investigates flame stability and NOx emissions in hydrogen combustion for aviation, suggesting gains in sustainability.