Abstract
Predictive SI engine combustion models have been developed on the basis of fundamental measurements of the laminar and turbulent burning velocity. The present paper outlines experiments carried out using a spherical fan-stirred combustion vessel operated with initial pressures of up to 0.5MPa. Explosions were carried out using methane-air, propane-air and hydrogen-air mixtures at various equivalence ratios. The influences of increasing pressure on the laminar and turbulent burning velocity are discussed and correlations are presented in terms of a Lewis number (a function of local thermo-diffusion) and Markstein number (derived directly from experiments).
Keywords:Laminar and turbulent combustion, burning velocity, pressure, Lewis Number, Markstein Number