Effects of CO₂ Dilution on Iso-octane Laminar and Turbulent Premixed Flames

-On Stoichiometric Mixture-

Abstract

The effects of mixture dilution with CO₂ on outwardly propagating laminar and turbulent flames were studied for stoichiometric iso-octane / air mixtures at the initial pressures from 0.10 to 0.50MPa. The CO₂ dilution rate, defined as the molar fraction of CO₂ in the air and CO₂, was varied up to 0.10. The unstretched laminar burning velocity decreased with increasing the dilution rate. The Markstein number decreased for increasing CO₂ dilution rate. The ratios of turbulent burning velocity to unstretched laminar one increased with increasing CO₂ dilution rate.