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THERMAL SCIENCE
International Scientific Journal
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NUMERICAL STUDY ON COMBUSTION AND EMISSION OF NH3/CH4 MIXTURES UNDER GAS TURBINE CONDITIONS: EFFECTS OF PRESSURE AND HYDROGEN
ABSTRACT
To improve the combustion performance of NH3/CH4 mixtures, this study, based on the Chemkin PREMIX model and the Okafor reaction mechanism, analyzes the effects of varying hydrogen content, initial pressure, and equivalence ratio on laminar burning velocity and associated radical concentrations of NH3/CH4 mixtures. The study investigates the promotional effect of hydrogen addition on the combustion reaction chain and quantitatively analyzes the linear relationship between laminar burning velocity and H + NH2 radical concentrations. The results show that hydrogen addition significantly enhances the combustion speed, with a peak at an equivalence ratio of 1.05-1.1, while laminar burning velocity decreases with increasing pressure. The increase in hydrogen content promotes the formation of key radicals such as H, OH, and NH₂, Also, the study reveals a strong linear correlation between laminar burning velocity and the concentration of max (H + NH2) radicals, with this relationship being significantly influenced by the pressure change.
KEYWORDS
laminar burning velocity, radical concentration, carbon emissions, ammonia, hydrogen, methane emission
PAPER SUBMITTED: 2025-04-05
PAPER REVISED: 2025-05-12
PAPER ACCEPTED: 2025-05-14
PUBLISHED ONLINE: 2025-07-05
DOI REFERENCE: https://doi.org/10.2298/TSCI250405120Z
CITATION EXPORT: view in browser or download as text file
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© 2026 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence