Study on NOx formation in CH4/air jet combustion

With the development of reaction kinetics and transfer science, the modeling of NO, formation plays more and more important roles in the protection of environment and the design of combustion reactors; in this case, turbulence-chemistry model and NOx formation model are the two most important aspects. For thermal NO, mechanism, this article studied the CH4/air system and applied a set of latest NO formation rate constants published at the Leed University which replaced the original model code in FLUENT to increase its precision on prediction of NO concentration. The realizable k-epsilon model, Reynold Stress model and standard k-epsilon model were also investigated to predict the turbulent combustion reaction, which indicated that the simulation results of velocities, temperatures and concentrations of combustion productions by the standard k-epsilon model were in good accordance with the experimental data. With the application of the simulation results to the experimental data to fit some important kinetic parameters in the equation of O atom model and revision of the equation later, this article obtained a new NO formation rate model. It has been proved that the prediction of the developed model coincides well with the measurements.