Ignition of non-premixed counterflow flames of octane and decane isomers

Liu, Ning; Mani Sarathy, S.; Westbrook, Charles K.; Egolfopoulos, Fokion N.

doi:10.1016/j.proci.2012.05.040

Ignition of non-premixed counterflow flames of octane and decane isomers

Journal Article · Fri Aug 31 00:00:00 EDT 2012 · Proceedings of the Combustion Institute

DOI:https://doi.org/10.1016/j.proci.2012.05.040· OSTI ID:1755815

Liu, Ning ^[1]; Mani Sarathy, S. ^[2]; Westbrook, Charles K. ^[2]; Egolfopoulos, Fokion N. ^[1]

Univ. of Southern California, Los Angeles, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

We report ignition temperatures of non-premixed flames of octane and decane isomers were determined in the counterflow configuration at atmospheric pressure, a free-stream fuel/N₂ mixture temperature of 401 K, a local strain rate of 130 s^–1, and fuel mole fractions ranging from 1% to 6%. The experiments were modeled using detailed chemical kinetic mechanisms for all isomers that were combined with established H₂, CO, and n-alkane models, and close agreements were found for all flames considered. The results confirmed that increasing the degree of branching lowers the ignition propensity. On the other hand, increasing the straight chain length by two carbons was found to have no measurable effect on flame ignition for symmetric branched fuel structures. Detailed sensitivity analyses showed that flame ignition is sensitive primarily to the H₂/CO and C₁–C₃ hydrocarbon kinetics for low degrees of branching, and to fuel-related reactions for the more branched molecules.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: US Air Force Office of Scientific Research (AFOSR); US Department of the Navy, Office of Naval Research (ONR); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1755815

Report Number(s):: LLNL-JRNL--521833; 552491

Journal Information:: Proceedings of the Combustion Institute, Journal Name: Proceedings of the Combustion Institute Journal Issue: 1 Vol. 34; ISSN 1540-7489

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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Kinetic modeling
Non-premixed flames
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