1986
DOI: 10.1080/00102208608923905
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Engine HC Emissions Modeling: Partial Burn Effects

Abstract: A comparison of predicted and experimental H C emissions at high rates of exhaust gas recirculation (EGR), indicates that partial burning is responsible for significant changes in H C emission trends under otherwise normal, non-misfiring engine operating conditions. Ionprobe experiments show a measurable fraction of engine cycles in which the flame did not completely propagate across the chamber whenever HC emissions were high. A simple semi-empirical model is proposed to predict H C emissions from partial bur… Show more

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Cited by 18 publications
(2 citation statements)
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“…With the conditions experienced within the combustion chamber of an engine, particularly in the bulk gases present in the flame, scrambling mechanisms would be expected to be at least as competitive as the oxidative-pyrolysis chemistry taking place. However, under the stoichiometric engine conditions employed during these experiments, incomplete combustion in the bulk gas has been shown not to contribute to the hydrocarbon emissions (Lavoie et al, 1986). Instead, there are two major sources of emissions in a well-maintained engine (Adamczyk et al, 1983;Kaiser et al, 1982) -the partial oxidation of unburnt fuel (a) stored in crevice volumes and (b) dissolved in the lubricating oil film during the compression stroke where the fuel is protected from the flame.…”
mentioning
confidence: 97%
“…With the conditions experienced within the combustion chamber of an engine, particularly in the bulk gases present in the flame, scrambling mechanisms would be expected to be at least as competitive as the oxidative-pyrolysis chemistry taking place. However, under the stoichiometric engine conditions employed during these experiments, incomplete combustion in the bulk gas has been shown not to contribute to the hydrocarbon emissions (Lavoie et al, 1986). Instead, there are two major sources of emissions in a well-maintained engine (Adamczyk et al, 1983;Kaiser et al, 1982) -the partial oxidation of unburnt fuel (a) stored in crevice volumes and (b) dissolved in the lubricating oil film during the compression stroke where the fuel is protected from the flame.…”
mentioning
confidence: 97%
“…In a more recent study, D'Errico et al [40] presented a pollutant emissions model for SI engines, which included an eddy burning model for the accurate prediction of heat release, the extended Zeldovich mechanism for the prediction of N Ox emissions, a two step reactions CO model and a single Arrhenius equation for HC post oxidation, given by Lavoie and Blumberg [47]. The temperature distribution is achieved by dividing the mixture into an adiabatic core and a thermal boundary layer, where this core was further divided into an equal mass of adiabatic zones.…”
Section: Simplified Kinetic Modelsmentioning
confidence: 99%