TY - GEN
T1 - Effects of ethylene addition on counterflow ignition and flame propagation in methane/ethylene mixtures
AU - Liu, W.
AU - Huang, Y.
AU - Lu, T. F.
AU - Zhu, D. L.
AU - Law, C. K.
PY - 2007
Y1 - 2007
N2 - The ignition temperatures of nitrogen-diluted mixtures of methane and ethylene were measured by conterflowing heated air up to 3atms. In addition, the laminar flame speeds of air, methane and ethylene mixtures were obtained in the conterflow system under atmospheric pressure, for extensive ranges of lean-to-rich equivalence ratio. These experimental data, relevant to low-temperature ignition chemistry and high-temperature flame chemistry, were subsequently compared with calculations using two detailed ethylene mechanisms consisting of 70 and 75 species respectively. Sensitivity and Computational Singular Perturbation (CSP) analyses were applied to identify the role of ethylene addition in facilitating nonpremixed ignition and promoting premixed flame propagation. Furthermore, by studying the ignition response and flame propagation of these mixtures of hydrocarbons of the same family but with quite different reactivities, the hierarchical nature of the associated oxidation kinetics was assessed. This issue was further examined by comparing the sizes of the reduced mechanisms of the pure fuels and their mixtures.
AB - The ignition temperatures of nitrogen-diluted mixtures of methane and ethylene were measured by conterflowing heated air up to 3atms. In addition, the laminar flame speeds of air, methane and ethylene mixtures were obtained in the conterflow system under atmospheric pressure, for extensive ranges of lean-to-rich equivalence ratio. These experimental data, relevant to low-temperature ignition chemistry and high-temperature flame chemistry, were subsequently compared with calculations using two detailed ethylene mechanisms consisting of 70 and 75 species respectively. Sensitivity and Computational Singular Perturbation (CSP) analyses were applied to identify the role of ethylene addition in facilitating nonpremixed ignition and promoting premixed flame propagation. Furthermore, by studying the ignition response and flame propagation of these mixtures of hydrocarbons of the same family but with quite different reactivities, the hierarchical nature of the associated oxidation kinetics was assessed. This issue was further examined by comparing the sizes of the reduced mechanisms of the pure fuels and their mixtures.
UR - http://www.scopus.com/inward/record.url?scp=84946547897&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84946547897&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84946547897
T3 - Fall Technical Meeting of the Eastern States Section of the Combustion Institute 2007 "Chemical and Physical Processes in Combustion"
SP - 290
EP - 295
BT - Fall Technical Meeting of the Eastern States Section of the Combustion Institute 2007 "Chemical and Physical Processes in Combustion"
PB - Combustion Institute
T2 - Fall Technical Meeting of the Eastern States Section of the Combustion Institute 2007: Chemical and Physical Processes in Combustion
Y2 - 21 October 2007 through 24 October 2007
ER -