Abstract
A new laminar flamelet combustion model has been developed for application to fully premixed turbulent combustion in spark-ignition engines. The new model is applicable to combustion at moderate turbulence intensities typical of conditions in many engines in which laminar flame instability effects can be important. It is formulated in such a way that it reverts to an earlier theoretiecal model by Bray, Moss, and Libby in the case of combustion at high turbulence intensities. At low turbulence intensities, it mimies results of the numerical simulations by Joulin and Cambray. A Markstein number charactereizing the stretch response of a laminar flame appears as a parameter in the model equations. An experiment using laser sheet tomography has been performed that confirms the predicted influence of Markstein number on flame brush structure. Turbulent burning velocities are also predicted using KPP theory. Results are in satisfactory agreement with published data.
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