Résumé:
This study investigates the combustion characteristics of methane-air mixtures using ANSYS
Fluent, focusing on three main aspects: global reaction modeling, the effects of hydrogen addition, and a
detailed chemical reaction mechanism. The global reaction analysis explores the fundamental combustion
behavior of methane in air, establishing a baseline for comparison with more complex scenarios. The second
part of the study examines the impact of adding hydrogen to the methane-air mixture, with particular
attention to the changes in combustion efficiency, flame characteristics, and pollutant emissions. Finally, a
detailed mechanism involving a comprehensive set of chemical reactions is implemented to capture the
complex interactions within the combustion process, providing deeper insight into species formation,
temperature distribution, and reaction pathways.
The results from these three approaches are compared to highlight the effects of hydrogen on
combustion dynamics and the accuracy of global versus detailed reaction models in predicting real-world
behavior. This comparative analysis reveals that hydrogen addition enhances combustion efficiency,
reduces emissions, and alters the flame structure, while the detailed mechanism offers a more accurate
prediction of temperature profiles and species concentrations compared to the global reaction model.
Overall, this study underscores the importance of selecting the appropriate modeling approach based on the
desired level of accuracy and computational resources.
