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Numerical Investigation of Laminar Flame Speed of Gasoline - Ethanol/Air Mixtures with Varying Pressure, Temperature and Dilution
ISSN: 1946-3936, e-ISSN: 1946-3944
Published April 12, 2010 by SAE International in United States
Citation: Syed, I., Yeliana, Y., Mukherjee, A., Naber, J. et al., "Numerical Investigation of Laminar Flame Speed of Gasoline - Ethanol/Air Mixtures with Varying Pressure, Temperature and Dilution," SAE Int. J. Engines 3(1):517-528, 2010, https://doi.org/10.4271/2010-01-0620.
A numerical analysis was performed to study the variation of the laminar burning speed of gasoline-ethanol blend, pressure, temperature and dilution using the one-dimensional premixed flame code CHEMKIN™. A semi-detailed validated chemical kinetic model (142 species and 672 reactions) for a gasoline surrogate fuel was used. The pure components in the surrogate fuel consist of n-heptane, isooctane and toluene. The ethanol mole fraction was varied from 0 to 85 percent, initial pressure from 4 to 8 bar, initial temperature from 300 to 600K, and the EGR dilution from 0 to 32% to represent the in-cylinder conditions of a spark-ignition engine. The laminar flame speed is found to increase with ethanol concentration and temperature but decrease with pressure and dilution. A correlation has been proposed to calculate laminar flame speeds of gasoline-ethanol/air mixtures at different pressures, temperatures, and EGR that can be used in parametric burn rate combustion models for engine simulation.