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, u' was set to 0.80 and 1.59m/s. The Lewis number of the mixture, Le was employed to quantify the thermo-diffusive effects on turbulent burning velocities. The ratios of the turbulent burning velocities at 30mm flame radius to laminar ones, U_<tn>(30mm)/U_n (30mm) increased as the turbulence Reynolds number, Re_<Lf> increased. And U_<tn>(30mm)/U_n(30mm) increased with the decrease in the Lewis number. Possible correlations of U_<tn>(30mm)/U_n(30mm) were developed in terms of U'/U_n (30mm) and Re_<Lf>/Le^2.
