What question did this study set out to answer?

To develop, optimize, and experimentally validate a low-NOx premixed hydrogen-air injector operating stably at an elevated pressure of 9 bar for aviation combustors.

August 15, 2026Journal of Engineering for Gas Turbines and Power

Stabilization of Premixed Swirled Hydrogen-Air Flame At Elevated Pressures

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Authors

JRJiangheng RuanUniversité Paris-Saclay GPGuillaume PillaUniversité Paris-Saclay SPSylvain PetitCentre National de la Recherche Scientifique

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Implication

Simulation and experimental study reveals flame stabilization via pilot hydrogen injection in 9-bar combustors, highlighting ultra-low nitrogen oxide emissions for aviation.

Key Points

To develop, optimize, and experimentally validate a low-NOx premixed hydrogen-air injector operating stably at an elevated pressure of 9 bar for aviation combustors.
Performed Large Eddy Simulations (LES) evaluating a fully premixed injector concept versus a concept incorporating a secondary pilot hydrogen injection using detailed chemical kinetics and the Zeldovich NOx model.
Conducted 9-bar validation experiments on the MICADO test bench using OH* chemiluminescence, planar laser-induced fluorescence (OH-PLIF), and exhaust gas sampling for NOx and residual hydrogen.
Fully premixed combustion lowered flame temperatures and NOx emissions but suffered from a narrow operational range and flame blow-off instability.
Introducing a small hydrogen pilot injection ratio effectively stabilized the swirled flame across a broader range of high-pressure operating conditions.
Numerical simulation results showed close agreement with experimental flame structure imaging and exhaust gas measurements.

Cite This Study

Ruan et al. (2026) studied this question.

synapsesocial.com/papers/6a8019ce75c2e31742c85f57 https://doi.org/10.1115/1.4072532

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Implication

Simulation and experimental study reveals flame stabilization via pilot hydrogen injection in 9-bar combustors, highlighting ultra-low nitrogen oxide emissions for aviation.

Stabilization of Premixed Swirled Hydrogen-Air Flame At Elevated Pressures

Discussion

Member takes

Implication

Key Points

Cite This Study

Stabilization of Premixed Swirled Hydrogen-Air Flame At Elevated Pressures

Discussion

Member takes

Implication

Key Points

Cite This Study

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