THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

Yanfei Zhang

,

Qing Hao

,

Mingming Huang

,

Wenlong Wang

,

Qin Li

,

Zhaoling Zhang

,

Lei Dong

,

Yumeng Cao

online first only

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 ammonia/ methane 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 ammonia/ methane mixtures. Thestudy 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
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Numerical study on combustion and emission of NH3/CH4 mixtures under gas turbine conditions: Effects of pressure and hydrogen