Experimental study and numerical validation of oxy-ammonia combustion at elevated temperatures and pressures

Alka Karan (1) , Guillaume Dayma (1) , Christian Chauveau (1) , Fabien Halter (1)

1 ICARE - Institut de Combustion, Aérothermique, Réactivité et Environnement

The combustion of fossil fuels, which are mostly based on hydrocarbon chains, produces large quanti ties of carbon dioxide which is a major contributor to the global warming. Due to alarming concerns, initiatives are taken to promote the use of ’zero-carbon fuel’. The use of ammonia as an alternative fuel in combustors like gas turbines and spark-ignition engines have already been tested. As high pressures and temperatures are encountered in these combustors, it is essential to find laminar flame speed data for ammonia combustion at these conditions. The present study focuses on performing experiments at elevated conditions for different equivalence ratios in a constant volume spherical chamber. A literature study was performed to select and evaluate the most recent kinetic mechanisms for ammonia combustion under these conditions. A sensitivity analysis highlighting the key reactions for two of the schemes has been performed. A range of exponential factors for temperature and pressure which is used to calculate the flame speeds for a given reference conditions : αand βhave been determined.

Mots clés: Ammonia; Laminar flame speed; Constant volume chamber; Elevated conditions; Combustion; laminar flame speed; constant volume chamber; elevated conditions

Domaines: Milieux fluides et réactifs

Alka Karan, Guillaume Dayma, Christian Chauveau, Fabien Halter. Experimental study and numerical validation of oxy-ammonia combustion at elevated temperatures and pressures. Combustion and Flame, 2022, 236, pp.111819. ⟨10.1016/j.combustflame.2021.111819⟩. ⟨hal-03410767⟩