TY - JOUR
T1 - An experimental and computational study of the burning rates of ultra-lean to moderately-rich H2/O2/N2 laminar flames with pressure variations
AU - Egolfopoulos, F. N.
AU - Law, Chung King
N1 - Funding Information:
This work was supported by the U.S. Air Force Office of Scientific Research under the technical monitoring of Dr. Julian M. Tishkoff. It is also a pleasure to acknowledge the very helpful discussions with Drs. K. Brezinsky and R. Yctter of Princeton University during the course of this investigation, and some calculations performed on our behalf by Dr. M. Rabinowitz of NASA-Lewis as an independent check of the accuracy of our numerical results.
PY - 1991
Y1 - 1991
N2 - By using the counterflow flame technique, laminar flame speeds of H2/O2/N2 mixtures have been experimentally determined in the fuel stoichiometric range of ultra-lean to moderately-rich, oxygen concentration range of 7.4 to 30 molar percent of the oxidizer, and pressure range of 0.2 to 2.25 atm. These results are then compared with the numerically-determined values obtained by using several existing H2/O2 kinetic schemes. Results show that, while these kinetic schemes accurately predict the propagation speeds of high-temperature flames, they substantially underpredict those of low-temperature flames. Furthermore, while the experimental pressure exponents of the mass burning rates exhibit a minimum-point, parabola-like behavior with increasing pressure, indicating the initial, negative influence of the H-O2 termination reaction and the subsequent availability of a positive channel which facilitates radical production, the calculated results fail to show the increasing trend in the pressure range investigated. It is suggested that existing kinetic schemes may require revision in the intermediate-temperature regime strongly influenced by the HO2 and H2O2 chemistry.
AB - By using the counterflow flame technique, laminar flame speeds of H2/O2/N2 mixtures have been experimentally determined in the fuel stoichiometric range of ultra-lean to moderately-rich, oxygen concentration range of 7.4 to 30 molar percent of the oxidizer, and pressure range of 0.2 to 2.25 atm. These results are then compared with the numerically-determined values obtained by using several existing H2/O2 kinetic schemes. Results show that, while these kinetic schemes accurately predict the propagation speeds of high-temperature flames, they substantially underpredict those of low-temperature flames. Furthermore, while the experimental pressure exponents of the mass burning rates exhibit a minimum-point, parabola-like behavior with increasing pressure, indicating the initial, negative influence of the H-O2 termination reaction and the subsequent availability of a positive channel which facilitates radical production, the calculated results fail to show the increasing trend in the pressure range investigated. It is suggested that existing kinetic schemes may require revision in the intermediate-temperature regime strongly influenced by the HO2 and H2O2 chemistry.
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U2 - 10.1016/S0082-0784(06)80276-6
DO - 10.1016/S0082-0784(06)80276-6
M3 - Article
AN - SCOPUS:58149207338
SN - 0082-0784
VL - 23
SP - 333
EP - 340
JO - Symposium (International) on Combustion
JF - Symposium (International) on Combustion
IS - 1
ER -