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Impact of Ethanol additions on Autoignition Characteristics


Kang, Dongil; Goldsborough, S.; Fridlyand, Aleksandr; Mehl, Marco; Wagnon, Scott; Pitz, William; McNenly, Matthew


Ethanol is widely blended into commercial gasolines, as an oxygenate to mitigate pollutant formation, as well as an octane enhancer to improve knock resistance. Ethanol can also facilitate the use of lower-grade, or less-refined gasoline in modern internal combustion (IC) engines. However, the chemical kinetic interactions of ethanol with petroleum-based gasoline are not well understood, especially towards autoignition propensity over a range of conditions. These interactions are critical for improving knock resistance, as well as towards performance in low temperature combustion schemes, such as gasoline compression ignition. This study investigates the chemical kinetic interactions of ethanol with a full boiling range gasoline, where blending ratios of 0 to 30 vol./vol. are covered. A mid-octane range (Anti Knock Index 91.5) Fuels for Advanced Combustion Engines gasoline is employed, while a variety of multi-component surrogate blends are also studied. Autoignition data are acquired within a rapid compression machine at temperature, pressure, and fuel loading conditions representative of advanced IC engines. Changes in low-temperature behavior, including first-stage ignition times and extents of low temperature heat release, as well as main ignition times are quantified for the neat fuels and the ethanol-blended fuels. A recently-updated, detailed chemical kinetic model for the gasoline surrogates is used to interpret the measurements, and better understand the kinetic pathways.



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Conference Paper