TY - JOUR
T1 - Laminar flame speeds and oxidation kinetics of iso-octane-air and n-heptane-air flames
AU - Davis, S. G.
AU - Law, C. K.
N1 - Funding Information:
This work was supported by the Air Force Office of Scientific Research under the technical management of Dr. Julian M. Tishkoff. It is a pleasure to acknowledge discussions with and assistance from Professor F. L. Dryer of Princeton University, Dr. C. K. Westbrook and Dr. H. Curran of the Lawrence Livermore Laboratories, and Professor H. Wang of the University of Delaware.
PY - 1998
Y1 - 1998
N2 - 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.
AB - 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.
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U2 - 10.1016/S0082-0784(98)80442-6
DO - 10.1016/S0082-0784(98)80442-6
M3 - Conference article
AN - SCOPUS:0032272663
SN - 0082-0784
VL - 27
SP - 521
EP - 527
JO - Symposium (International) on Combustion
JF - Symposium (International) on Combustion
IS - 1
T2 - 27th International Symposium on Combustion
Y2 - 2 August 1998 through 7 August 1998
ER -