Journal
PROCEEDINGS OF THE COMBUSTION INSTITUTE
Volume 34, Issue -, Pages 873-880Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2012.05.104
Keywords
Flame ignition; Alkylated cyclohexane; Non-premixed flames; Surrogate fuels; Kinetic modeling
Funding
- U.S. Air Force Office of Scientific Research AFOSR [FA9550-10-1-0087, FA9550-08-1-0040]
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Ignition temperatures of non-premixed cyclohexane, methylcyclohexane, ethylcyclohexane, n-propylcyclohexane, and n-butylcyclohexane flames were measured in the counterflow configuration at atmospheric pressure, a free-stream fuel/N-2 mixture temperature of 373 K, a local strain rate of 120 s(-1), and fuel mole fractions ranging from 1% to 10%. Using the recently developed JetSurf 2.0 kinetic model, satisfactory predictions were found for cyclohexane, methyl-, ethyl-, and n-propyl-cyclohexane flames, but the n-butylcyclohexane data were overpredicted by 20 K. The results showed that cyclohexane flames exhibit the highest ignition propensity among all mono-alkylated cyclohexanes and n-hexane due to its higher reactivity and larger diffusivity. The size of mono-alkyl group chain was determined to have no measurable effect on ignition, which is a result of competition between fuel reactivity and diffusivity. Detailed sensitivity analyses showed that flame ignition is sensitive primarily to fuel diffusion and also to H-2/CO and C-1-C-3 hydrocarbon kinetics. (C) 2012 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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