Chemical Model of Gasoline-Ethanol Blends for Internal Combustion Engine Applications
Paper in proceedings, 2010

A semi-detailed chemical mechanism for combustion of gasoline-ethanol blends, which is based on sub-mechanisms of gasoline surrogate and for ethanol is developed and validated aiming at CFD engine modeling. The gasoline surrogate is composed of iso-octane, toluene, and n-heptane in volumetric proportions of 55%:35%:10%, respectively. In this way, the hydrogen-carbon atomic ratio H/C, which is around 1.87 for real gasoline, is accurately reproduced as well as a mixture equivalence ratio that is important for Gasoline Direct Injection engine applications. The integrated mechanism for gasoline-ethanol blends includes 120 species participating in 677 reactions. The mechanism is tested against experimental data on ignition delay times and laminar flame speeds, obtained for various n-heptane/iso-octane/toluene/ethanol-air mixtures under various equivalence ratios, initial temperatures, and pressures. Chemical, thermodynamic and transport properties used in the calculations are discussed.


Chen Huang

Chalmers, Applied Mechanics, Combustion

Valeri Golovitchev

Chalmers, Applied Mechanics, Combustion

Andrei Lipatnikov

Chalmers, Applied Mechanics, Combustion

SAE Paper 2010-01-0543

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