Abstract
Abstract
Flamefront NO emissions from spark ignition engines are estimated in this work using a two-zone thermo-dynamic combustion model, an unsteady engine flame model, the wrinkled laminar flame model of Bray and Moss, the k-ε theory and simplified flamefront NO chemistry which has been verified in steady laminar premixed flames. The results show that as much as 230 ppm of flamefront NO may be formed under stoichiometric engine operating conditions. The present approach is an alternative to the empirical correlations used to compute engine flamefront NO which are based on highly extrapolated data.
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