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• W2193669112 startingPage "1439" @default.
• W2193669112 abstract "Reduced fuel consumption, low pollutant emissions and adequate output performance are key features in the contemporary design of spark ignition engines. Zero-dimensional numerical simulation is an attractive alternative to engine experiments for the evaluation of various engine configurations. Both flame front reaction and post-flame processes contribute to the heat release rate. The contribution of this work is to highlight and model the role of post-flame reactions (CO and hydrocarbons) in the heat release rate. The modeling approach to CO kinetics used two reactions considered to be dominant and thus more suitable for the description of CO chemical mechanism. Equilibrium concentrations of all the species involved were calculated by a two-zone thermodynamic model. The computed characteristic time of CO kinetics was found to be of a similar order to the results of complex chemistry simulations. The proposed model captured the ‘freezing’ effect (reaction rate is almost zero) for temperatures lower than 1800 K and followed the trends of the measured values at exhaust. However, a consistent underestimation of CO levels at the exhaust was observed. The impact of the remaining CO on the combustion efficiency is considerable especially for rich mixtures. For a remaining 0.4% CO mass fraction, the impact on combustion inefficiency is 0.1%. Unburnt hydrocarbon, which have not reacted within the flame front before quenching, diffuse in the burnt gas and react. In this work, a global reaction rate models the kinetic behavior of hydrocarbon. The diffusion process was modeled by a relaxation equation applied on the calculated kinetic concentration. The relaxation time was calculated by the reduction of a general hydrocarbon diffusion equation. This modeling approach enabled the final part of combustion to be simulated. The HC consumption predicted by the model is consistent with the HC measurements at the exhaust. The hydrocarbon consumption at the final combustion stage varied from 1% to 6% depending on the operating point." @default.
• W2193669112 created "2016-06-24" @default.
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• W2193669112 date "2015-12-01" @default.
• W2193669112 modified "2023-09-26" @default.
• W2193669112 title "Near wall combustion modeling in spark ignition engines. Part B: Post-flame reactions" @default.
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• W2193669112 doi "https://doi.org/10.1016/j.enconman.2015.10.022" @default.
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