Numerical Simulation Of Diluent Effect On NOx Emission In A X Turbulent Premixed Methane Flames

Abstract

The stringent requirement to reduce the NO from various combustion devices while maintaining the combustor x performance is of paramount motivation for the current study. Partially premixing, fuel blends and fuel diluents represents promising approaches for reducing NO from flames. A detailed two dimensional, transient numerical study on the later aspect of fuel diluents x (helium) to reduce the NO emission in a back ward facing step geometry has been carried out using CFX 5.7. The equivalence ratio x has been varied from 0.85-1, to study the effect of excess air on NO emission. The methane flame is simulated using Eddy break-up x model with Zeldovich thermal mechanism for NO formation and the turbulence model is w-RSS (Reynolds Shear Stress). The x simulation results indicate that considerable reduction in NO emission and increase in flame stability can be achieved for a x predetermined addition of inert in to the fuel air mixture.