Influence of Thermo-diffusive Effects on Turbulent Propagating Iso-octane / Air / Inert Gas Flames at the Same Turbulence Karlovitz Number

Abstract

Exhaust Gas Recirculation (EGR) is one of the techniques for reducing NOx emissions. EGR gas consists mainly of N₂, H₂O and CO₂. Properties of flame diluted with EGR gas might be influenced by these components. The effects of dilution with CO₂ and N₂ on outwardly propagating turbulent flames were studied for stoichiometric iso-octane / air mixtures. Turbulent explosions were investigated at almost same turbulence Karlovitz number conditions. Properties of turbulent burning velocity were different between CO₂ and N₂ dilution. These differences may be caused by the thermo-diffusive effects on local flamelets of turbulent flame.