Abstract
Spherically propagating laminar and turbulent flames were studied using iso-octane/air mixtures with and without dilution. In order to examine the thermo-diffusive effects solely separating them from the effects of flame stretch, turbulent burning velocities were compared at constant flame stretch factors. The mean flame stretch factor acting on turbulent flame front may be represented by the turbulence Karlovitz number. Thus, turbulent explosions were carried out at fixed turbulence Karlovitz numbers. As a result, the ratio of turbulent burning velocity to unstretched laminar one increased with decreasing Markstein number. Especially, it changed stepwise around Markstein number of zero.
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