TY - JOUR
T1 - Experimental and modeling study of laminar flame speed and non-premixed counterflowignition of «-heptane
AU - Smallbone, A. J.
AU - Liu, W.
AU - Law, C. K.
AU - You, X. Q.
AU - Wang, H.
N1 - Funding Information:
The work was supported by the Air Force Office of Scientific Research under the technical monitoring of Dr. Julian M. Tishkoff. The work at Princeton University was also sponsored by the Army Research Office under the technical monitoring of Dr. Ralph A. Anthenien.
PY - 2009
Y1 - 2009
N2 - Laminar flame speeds were determined for n-heptane-oxygen-nitrogen mixtures over the pressure range of 0.5-2 atm and equivalence ratio range of 0.7-1.4, using the counterflow twin-flame technique. For pressure at or below 1.5 atm, the laminar flame speeds were collected for n-heptane-air mixtures, whereas the data at 2 atm are reported for diluted air of 18% O2-82% N 2. These experimental data, together with those acquired previously on the non-premixed counterflow ignition temperature of n-heptane determined over the same range of pressure, were simulated with a high-temperature, detailed kinetic model of n-heptane oxidation. After demonstrating satisfactory comparison between the model and experiment, the influence of pressure-induced kinetic effects on the laminar mass flux was analyzed through a computational determination of the overall reaction order. The non-premixed ignition temperature responses were in addition analyzed by numerical sensitivity analysis on reaction kinetics and fuel diffusion rate. The influence of uncertainties in the molecular transport on the model prediction of diffusive ignition is discussed.
AB - Laminar flame speeds were determined for n-heptane-oxygen-nitrogen mixtures over the pressure range of 0.5-2 atm and equivalence ratio range of 0.7-1.4, using the counterflow twin-flame technique. For pressure at or below 1.5 atm, the laminar flame speeds were collected for n-heptane-air mixtures, whereas the data at 2 atm are reported for diluted air of 18% O2-82% N 2. These experimental data, together with those acquired previously on the non-premixed counterflow ignition temperature of n-heptane determined over the same range of pressure, were simulated with a high-temperature, detailed kinetic model of n-heptane oxidation. After demonstrating satisfactory comparison between the model and experiment, the influence of pressure-induced kinetic effects on the laminar mass flux was analyzed through a computational determination of the overall reaction order. The non-premixed ignition temperature responses were in addition analyzed by numerical sensitivity analysis on reaction kinetics and fuel diffusion rate. The influence of uncertainties in the molecular transport on the model prediction of diffusive ignition is discussed.
KW - Elevated pressure and temperature
KW - Kinetic mechanism
KW - Non-premixed counterflow ignition temperatures
KW - Premixed laminar flame speeds
KW - n-heptane
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U2 - 10.1016/j.proci.2008.06.213
DO - 10.1016/j.proci.2008.06.213
M3 - Conference article
AN - SCOPUS:67649253058
SN - 1540-7489
VL - 32 I
SP - 1245
EP - 1252
JO - Proceedings of the Combustion Institute
JF - Proceedings of the Combustion Institute
IS - 1
T2 - 32nd International Symposium on Combustion
Y2 - 3 August 2008 through 8 August 2008
ER -