الفهرس 
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Abstract
ABSTRACT
In this study, the effect of using different ammonia/methane mixtures on the performance of turbulent diffusion flames was investigated. Ammonia can be produced from renewable energy sources and is a carbon-free fuel. Therefore, Ammonia can be considered as a promising alternative to fossil fuels and it plays a critical role in reducing the greenhouse emissions. Computational fluid dynamics (CFD) was used through ANSYS Fluent 19 to study the effect of adding different percentages of ammonia to methane on the combustion characteristics of a co-axial diffusion burner. Moreover, the burner’s geometry was changed by varying its air/fuel area ratio along with different flame conditions to predict their effects on the temperature distribution and NOx emissions. The results revealed that the peak temperature decreases by increasing both the ammonia percentage and the excess air factor across the two used types of oxidizers — pure oxygen and air. Additionally, by increasing the percentage of ammonia in the fuel, the formation of NOx increases. A minimum value of NOx was achieved when a burner with an area ratio of 6, at λ=1.5, NH3 =10% and air acting as an oxidizer were used.