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Investigation on the ignition properties of 1-propanol and 1-butanol under fuel-lean conditions
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on April 06, 2021 by SAE International in United States
Event: SAE WCX Digital Summit
To mitigate the global warming and to develop sustainable transportation, investigations on combustion properties of carbon neutral fuels i.e., electro-fuels and bio-fuels such as propanol and butanol are essential. In the past, there were very limited researches included the fuel-lean combustion of those fuels which is however a trend to reduce the NOx emissions and therefore the literature chemical kinetic mechanisms must be validated against the fuel-lean ignitions. Ignition delay time (IDT) is one key parameter for combustion properties and can be used for the validation of chemical kinetic mechanisms. IDTs of diluted 1-propanol and 1-butanol mixtures (90% bath gas (Ar+N2)) were therefore conducted in a rapid compression machine (RCM), which covers the working conditions of internal combustion engines. The experiments were carried out at temperatures between 800 and 1000 K, pressures of 20 and 40 bar, under lean combustion conditions with equivalence ratios (ф) of 0.25, 0.5 and 0.9. The IDTs of 1-propanol are notably slower than those of 1-butanol at the same conditions. The obtained experimental data were further compared with simulated results applying literature chemical kinetic mechanisms. The mechanisms from Johnson et al. (2009), Frassoldati et al. (2009), and Sarathy et al. (2014) were applied to validate IDTs of 1-propanol. The mechanisms from Grana et al. (2012), Sarathy et al. (2012) and Diaz et al. (2018) were used to validate IDTs of 1-butanol. Moreover, the influences of temperature, pressure, and equivalence ratio on IDTs were characterized by sensitivity analyses. The reactions of fuel molecules with HO2 and OH radicals are dominant for the autoignition of both 1-propanol and 1-butanol.