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Development of a Physics-Based Combustion Model for Engine Knock Prediction

expected to work well when end-gas ignition occurs in a single spot that maintains a high temperature favorable for ignition. The validation has been performed for the stoichiometric operations with and without the exhaust gas recirculation (EGR). The fuel tested is iso-octane. The in-cylinder pressure measurements in a single-cylinder version of the GM LNF 2.0L 4-cylinder design turbocharged gasoline direct injected (GDI) engine from the 2007 Pontiac Solstice were used for validation. The gas sampling measurements, which were originally planned, were not made. The results show that the developed CMC-FPF method captures knocking in stoichiometric operation cases studied. However, it did not capture knocking in a case with EGR. Besides the tasks that were originally planned, a laminar-to-turbulent ﬂame transition model has been developed to capture cycle-to-cycle variations (CCVs) in the burning rates in a spark ignition (SI) engine, which affect the thermodynamic trajectory of the end gas and thus its ignition delay. The results show that, at least, for conditions studied in this project, the modeling of variations in the early-stage burning rate is critical to capturing the degree of CCVs in in-cylinder pressure. The developed transition model captures the effects of turbulence intensity on the laminar-to-turbulent ﬂame transition, based on the Kolmogorov similarity hypothesis, and can be used in other premixed combustion models. The analysis of the factors affecting CCVs in the engine experiment was performed.