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Prediction of Combustion Chamber Deposit Growth in SI Engines
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Abstract
Combustion chamber deposit (CCD) formation in SI engines is a complex phenomenon which is dependent on a number of fuel and engine parameters. A mathematical model has been developed, based upon a previously proposed mechanism of CCD formation, which describes the physical and chemical processes controlling the growth of deposits in SI combustion chambers. The model allows deposit thickness to be predicted as a function of time, taking into account gasoline composition and factors influenced by engine operating conditions. Piston top deposit thicknesses predicted by the model for 38 unadditivated fuels show a strong correlation with data from three different bench engine tests. The model offers the possibility of predicting the amount of CCD produced by unadditivated gasolines for a range of engine designs, operating conditions and test durations.
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Price, R., Spink, C., and Morley, C., "Prediction of Combustion Chamber Deposit Growth in SI Engines," SAE Technical Paper 972835, 1997, https://doi.org/10.4271/972835.Also In
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