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Laminar Flame Speeds and Ignition Delay Times of Gasoline/Air and Gasoline/Alcohol/Air Mixtures: The Effects of Heavy Alcohol Compared to Light Alcohol

Abstract : The oxidation of gasoline and gasoline/alcohol blends is studied in a shock tube and a spherical reactor. A commercial oxy-free gasoline and two alcohols (ethanol and iso-pentanol) were used in this study. The spherical reactor experiments were conducted at an initial temperature of 483 K, initial pressure of 0.1 MPa, and equivalence ratios from 0.65 to 1.36. Ignition delay times were measured behind reflected shock waves. The shock tube experiments were conducted at 2 MPa over a temperature range from 955 to 1284 K and for two equivalence ratios (0.5 and 1). The experimental measurements indicate that replacing ethanol by iso-pentanol on a gasoline/alcohol blend results in flame speeds which are closer to the ones of a commercial gasoline at nearly stoichiometric conditions (an in-engine applications). On the other hand, the ignition delay times are more affected by the presence of iso-pentanol than the ethanol case. Two different surrogate fuels composed of n-heptane, iso-octane, and toluene were also tested against the newly obtained experimental results (oxy-free gasoline and mixtures with ethanol) using kinetic modeling with a reduced model [L. Cai, H. Pitsch, Combust. Flame 162 (2015) 1623-1637]. While a good agreement between real fuel and surrogate properties was observed for the laminar flame speeds, discrepancies were obtained between the measured and calculated ignition delay times especially in the lower temperature range of our study. Additional simulation analyses on the ignition delay times were
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https://hal.archives-ouvertes.fr/hal-03385120
Contributor : Andrea Comandini Connect in order to contact the contributor
Submitted on : Tuesday, October 19, 2021 - 1:20:11 PM
Last modification on : Friday, April 1, 2022 - 3:48:31 AM
Long-term archiving on: : Thursday, January 20, 2022 - 6:59:45 PM

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Andrea Comandini, Damien Nativel, Nabiha Chaumeix. Laminar Flame Speeds and Ignition Delay Times of Gasoline/Air and Gasoline/Alcohol/Air Mixtures: The Effects of Heavy Alcohol Compared to Light Alcohol. Sustainable Energy & Fuels, Royal Society of Chemistry, 2021, 35 (18), pp.14913-14923. ⟨10.1021/acs.energyfuels.1c01708⟩. ⟨hal-03385120⟩

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