Laminar flame speeds and oxidation kinetics of iso-octane-air and n-heptane-air flames

S. G. Davis, C. K. Law

Research output: Contribution to journalConference articlepeer-review

239 Scopus citations


Laminar flame speeds of iso-octane-air and n-heptane-air mixtures were determined experimentally over an extensive range of equivalence ratios at room temperature and atmospheric pressure, employing the counterflow twin flame configuration. Using both linear and nonlinear extrapolations, the effect of stretch was minimized by extrapolating the reference flame speed to vanishing stretch, with the nonlinearly extrapolated values being typically 2 cm/s smaller. The laminar flame speeds of iso-octane were found to be lower than those of n-heptane throughout the range of experimental equivalence ratios. Predictions, using a detailed kinetic model based on the works of Held et al. and of Curran, Pitz, and Westbrook, agreed quite well with experimental data, especially at lean equivalence ratios, while yielding somewhat lower values at stoichiometric to rich equivalence ratios. Since the n-heptane kinetics in the model were previously compared to flow-reactor data, the present model was also compared to an iso-octane oxidation flow-reactor experiment. The model accurately predicted the fuel decay profile as well as those of propene and iso-butene, which are the two major intermediates formed initially at flow-reactor conditions. The present analysis suggests that the major high-temperature reaction pathways proposed by Curran et al. accurately describe the high-temperature oxidation of iso-octane and indicates that the development of a comprehensive model requires additional studies on the reaction kinetics of propene and iso-butene.

Original languageEnglish (US)
Pages (from-to)521-527
Number of pages7
JournalSymposium (International) on Combustion
Issue number1
StatePublished - 1998
Event27th International Symposium on Combustion - Boulder, CO, United States
Duration: Aug 2 1998Aug 7 1998

All Science Journal Classification (ASJC) codes

  • General Chemical Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Mechanical Engineering
  • Physical and Theoretical Chemistry
  • Fluid Flow and Transfer Processes


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