TY - JOUR
T1 - The reactions supporting or opposing the development of explosive modes
T2 - Auto-ignition of a homogeneous methane/air mixture
AU - Diamantis, Dimitris J.
AU - Kyritsis, Dimitris C.
AU - Goussis, Dimitris A.
N1 - Funding Information:
The work of DAG has been co-financed by the European Union (European Social Fund - ESF) and Greek national funds through the Operational Program “Education and Lifelong Learning” of the National Strategic Reference Framework (NSRF) - Research Funding Program: “ARISTEIA”.
Publisher Copyright:
© 2014 The Combustion Institute.
PY - 2015
Y1 - 2015
N2 - The development of time scales that characterize the initiation of an auto-ignition processes is supported by specific reactions and is opposed by some others. An algorithmic tool which identifies these two sets of reactions is validated on the basis of the auto-ignition of a homogeneous stoichiometric methane/air mixture at 50 bar and 1100 K. It is shown that this process is characterized by two time scales, the fastest of which relates to the generation of the required for ignition radical pool and the temperature increase. This time scale associates mainly to carbon chemistry, except the very last period of its presence where it relates to hydrogen/oxygen-chemistry. The analysis allows for the quantitative assessment of several chemical phenomena that have been associated with the abnormal long ignition delay of methane, such as the formation of C2H6 and the relative importance of the formation of CH2O and CH3O as means of consumption of CH3 radicals. The identification of the reactions supporting or opposing the initiation of the auto-ignition is most useful when it is desired to control the ignition process.
AB - The development of time scales that characterize the initiation of an auto-ignition processes is supported by specific reactions and is opposed by some others. An algorithmic tool which identifies these two sets of reactions is validated on the basis of the auto-ignition of a homogeneous stoichiometric methane/air mixture at 50 bar and 1100 K. It is shown that this process is characterized by two time scales, the fastest of which relates to the generation of the required for ignition radical pool and the temperature increase. This time scale associates mainly to carbon chemistry, except the very last period of its presence where it relates to hydrogen/oxygen-chemistry. The analysis allows for the quantitative assessment of several chemical phenomena that have been associated with the abnormal long ignition delay of methane, such as the formation of C2H6 and the relative importance of the formation of CH2O and CH3O as means of consumption of CH3 radicals. The identification of the reactions supporting or opposing the initiation of the auto-ignition is most useful when it is desired to control the ignition process.
KW - Auto-ignition
KW - Computational singular perturbation
KW - Explosive time scales
UR - http://www.scopus.com/inward/record.url?scp=84947543733&partnerID=8YFLogxK
U2 - 10.1016/j.proci.2014.07.063
DO - 10.1016/j.proci.2014.07.063
M3 - Article
AN - SCOPUS:84947543733
SN - 1540-7489
VL - 35
SP - 267
EP - 274
JO - Proceedings of the Combustion Institute
JF - Proceedings of the Combustion Institute
IS - 1
ER -