Journal
PROCEEDINGS OF THE COMBUSTION INSTITUTE
Volume 32, Issue -, Pages 501-508Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2008.06.180
Keywords
Detailed kinetic model; Gasoline surrogates; Shock tube; Autoignition; Ignition delay time
Funding
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico - CNPq - Brazil
- Deutscher Akademischer Austausch Dienst (DAAD)
- German Research Foundation (DFG)
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Ignition-delay times were measured in shock-heated gases for a surrogate gasoline fuel comprised of ethanol/iso-octane/n-heptane/toluene at a composition of 40%/37.8%/10.2%/12% by liquid volume with a calculated octane number of 98.8. The experiments were carried out in stoichiometric mixtures in air behind reflected shock waves in a heated high-pressure shock tube, Initial reflected shock conditions were as follows: Temperatures of 690-1200 K, and pressures of 10, 30 and 50 bar, respectively. Ignition delay times were determined from CH* chemiluminescence at 431.5 nm measured at a sidewall location. The experimental results are compared to simulated ignition delay times based on detailed chemical kinetic mechanisms. The main mechanism is based on the primary reference fuels (PRF) model, and sub-mechanisms were incorporated to account for the effect of ethanol and/or toluene. The simulations are also compared to experimental ignition-delay data from the literature for ethanol/iso-octane/n-heptane (20%/62%/18% by liquid volume) and iso-octane/n-heptane/toluene (69%/17%/14% by liquid volume) surrogate fuels. The relative behavior of the ignition delay times of the different surrogates was well predicted, but the simulations overestimate the ignition delay, mostly at low temperatures. Crown copyright (c) 2009 Published by Elsevier Inc. on behalf of The Combustion Institute All rights reserved.
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