TY - JOUR
T1 - Chemical explosive mode analysis for a turbulent lifted ethylene jet flame in highly-heated coflow
AU - Luo, Zhaoyu
AU - Yoo, Chun Sang
AU - Richardson, Edward S.
AU - Chen, Jacqueline H.
AU - Law, Chung K.
AU - Lu, Tianfeng
N1 - Funding Information:
The work at University of Connecticut was supported by the National Science Foundation under Grant No. 0904771. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation. The work at Ulsan National Institute of Science and Technology (UNIST) was supported by the 2009 Research Fund of UNIST. The work at Sandia National Laboratories (SNL) was supported by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences of the US Department of Energy, and the US Department of Energy SciDAC Program. SNL is a multi-program laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the US Department of Energy under contract DE-AC04-94AL85000. The simulation used resources of the National Center for Computational Sciences (NCCS) at ORNL, which is supported by the Office of Science of the US DOE under contract DE-AC05-00OR22725. The work at Princeton University was supported by AFOSR under the technical monitoring of Dr. Julian M. Tishkoff.
PY - 2012
Y1 - 2012
N2 - The recently developed method of chemical explosive mode (CEM) analysis (CEMA) was extended and employed to identify the detailed structure and stabilization mechanism of a turbulent lifted ethylene jet flame in heated coflowing air, obtained by a 3-D direct numerical simulation (DNS). It is shown that CEM is a critical feature in ignition as well as extinction phenomena, and as such the presence of a CEM can be utilized in general as a marker of explosive, or pre-ignition, mixtures. CEMA was first demonstrated in 0-D reactors including auto-ignition and perfectly stirred reactors, which are typical homogeneous ignition and extinction applications, respectively, and in 1-D premixed laminar flames of ethylene-air. It is then employed to analyze a 2-D spanwise slice extracted from the 3-D DNS data. The flame structure was clearly visualized with CEMA, while it is more difficult to discern from conventional computational diagnostic methods using individual species concentrations or temperature. Auto-ignition is identified as the dominant stabilization mechanism for the present turbulent lifted ethylene jet flame, and the contribution of dominant chemical species and reactions to the local CEM in different flame zones is quantified. A 22-species reduced mechanism with high accuracy for ethylene-air was developed from the detailed University of Southern California (USC) mechanism for the present simulation and analysis.
AB - The recently developed method of chemical explosive mode (CEM) analysis (CEMA) was extended and employed to identify the detailed structure and stabilization mechanism of a turbulent lifted ethylene jet flame in heated coflowing air, obtained by a 3-D direct numerical simulation (DNS). It is shown that CEM is a critical feature in ignition as well as extinction phenomena, and as such the presence of a CEM can be utilized in general as a marker of explosive, or pre-ignition, mixtures. CEMA was first demonstrated in 0-D reactors including auto-ignition and perfectly stirred reactors, which are typical homogeneous ignition and extinction applications, respectively, and in 1-D premixed laminar flames of ethylene-air. It is then employed to analyze a 2-D spanwise slice extracted from the 3-D DNS data. The flame structure was clearly visualized with CEMA, while it is more difficult to discern from conventional computational diagnostic methods using individual species concentrations or temperature. Auto-ignition is identified as the dominant stabilization mechanism for the present turbulent lifted ethylene jet flame, and the contribution of dominant chemical species and reactions to the local CEM in different flame zones is quantified. A 22-species reduced mechanism with high accuracy for ethylene-air was developed from the detailed University of Southern California (USC) mechanism for the present simulation and analysis.
KW - Autoignition
KW - Chemical explosive mode analysis
KW - Direct numerical simulation
KW - Mechanism reduction
KW - Turbulent lifted flame
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U2 - 10.1016/j.combustflame.2011.05.023
DO - 10.1016/j.combustflame.2011.05.023
M3 - Article
AN - SCOPUS:83255182132
SN - 0010-2180
VL - 159
SP - 265
EP - 274
JO - Combustion and Flame
JF - Combustion and Flame
IS - 1
ER -