Effects of Pressure on Laminar and Turbulent Burning Velocities of Iso-octane Premixed Flames

Abstract

The effects of pressure on outwardly propagating laminar and turbulent flames were studied for iso-octane / air mixtures at the equivalence ratios from 0.8 to 1.4 and the initial pressures from 0.10 to 0.50MPa. Turbulence intensity was set to 0.80 and 1.59m/s. The Markstein number decreased for increasing pressures and for large equivalence ratios. The ratios of turbulent to unstretched laminar burning velocities at a constant Peclet number increased with increasing turbulence Karlovitz number and decreasing Markstein number at a constant pressure. However, the burning velocity ratios did not increase with increasing pressure although the Markstein number reduced with pressure.