Effect of Various Amounts of Ethanol on the Ignition Delay Time and Laminar Flame Speed of a Gasoline Surrogate: Experimental and Detailed Kinetic Modeling Study

摘要

Ignition delay times were measured behind reflected shock waves for a gasoline surrogate (50% iso-octane / 35% toluene / 15% 1-hexene by mole %) containing various blend ratios of ethanol (10, 20, 50 and 85% by mole %, the total mole fraction of the fuel being set to 0.1). Experiments were performed under stoichiometric conditions around 200 kPa and for temperatures ranging from 1220 to 2315 K. Results show that the addition of ethanol decreases the ignition delay. This decrease in the delay is however not proportional to the blended amount of ethanol as most of the reduction was achieved with an addition of 20% ethanol. A detailed kinetic model developed in a former study was used to successfully predict and interpret the results.