TY - JOUR
T1 - Outward propagation, burning velocities, and chemical effects of methane flames up to 60 ATM
AU - Rozenchan, G.
AU - Zhu, D. L.
AU - Law, Chung King
AU - Tse, S. D.
N1 - Funding Information:
It is a pleasure to acknowledge the generous help of Professor Frederick L. Dryer and Ms. Yolanda Stein with the GC analysis. This work was supported by the US Air Force Office of Scientific Research and NASA.
PY - 2002
Y1 - 2002
N2 - Using a specially designed high- and constant-pressure combustion chamber, the propagation and morphology of spark-ignited expanding spherical methane flames were imaged using schlieren cinematography and a high-speed digital camera. Stretch-free laminar burning velocities were subsequently determined for methane/air flames up to 20 atm and methane/oxygen/helium flames up to 60 atm. Computational simulation using GRI-MECH 3.0 showed satisfactory agreement with the experimental data up to 20 atm, and moderate deviation for pressures above 40 atm. Markstein lengths, global activation energies, and overall reaction orders were also determined as functions of pressure, with the latter two parameters exhibiting non-monotonic behavior caused by the changeover from H-O2 to HO2 chemistry similar to that of the explosion limits of homogeneous hydrogen/oxygen mixtures.
AB - Using a specially designed high- and constant-pressure combustion chamber, the propagation and morphology of spark-ignited expanding spherical methane flames were imaged using schlieren cinematography and a high-speed digital camera. Stretch-free laminar burning velocities were subsequently determined for methane/air flames up to 20 atm and methane/oxygen/helium flames up to 60 atm. Computational simulation using GRI-MECH 3.0 showed satisfactory agreement with the experimental data up to 20 atm, and moderate deviation for pressures above 40 atm. Markstein lengths, global activation energies, and overall reaction orders were also determined as functions of pressure, with the latter two parameters exhibiting non-monotonic behavior caused by the changeover from H-O2 to HO2 chemistry similar to that of the explosion limits of homogeneous hydrogen/oxygen mixtures.
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U2 - 10.1016/s1540-7489(02)80179-1
DO - 10.1016/s1540-7489(02)80179-1
M3 - Conference article
AN - SCOPUS:0037627939
VL - 29
SP - 1461
EP - 1470
JO - Proceedings of the Combustion Institute
JF - Proceedings of the Combustion Institute
SN - 1540-7489
IS - 2
T2 - 30th International Symposium on Combustion
Y2 - 25 July 2004 through 30 July 2004
ER -