A Numerical Prediction of Stabilized Turbulent Diffusion Flames Using Synthesis Fuel with Different Burner Configurations

Abstract

Combustion engines design mainly depends on achieving high combustion efficiency, taking into account pollutants concentrations resulting from combustion process. The thesis contain a numerical simulation study is used to model the steady-state combustion of an staged natural gas flame in a 300 kW swirl-stabilized burner, using ANSYS solver to find the highest combustion efficiency by changing variables in a furnace and showing the effect of flue gas recirculation, type of fuel and staging. The numerical simulations were performed by solving the governing equations in a three-dimensional model using realizable K-epsilon equations to express the turbulence and non- premixed flamelet combustion model taking into consideration radiation effect. The validation of the results was done by comparing it with other experimental data to ensure the agreement of the results. The study showed two zones of recirculation. The primary one is at the center of the furnace and the location of the secondary one varies by changing the quarl angle of the burner. It is found that the increase in temperature in the external recirculation zone is a result of increasing the swirl number of the inlet air stream.