TY - JOUR
T1 - Understanding cool flames and warm flames
AU - Ju, Yiguang
N1 - Funding Information:
The work presented here is a collaborative outcome of many research groups. YJ would like to thank particularly Jacqueline H. Chen, Zheng Chen, Daniel L. Dietrich, Frederick L. Dryer, Tanvir Farouk, Ronald Hanson, Chung K. Law, Kaoru Maruta, Michael E Mueller, Vedha Nayagam, Christopher Reuter, Forman A. Williams, Sang Hee Won, Omar Yehia, Tianhan Zhang, and Peng Zhao for sharing their results, collaborations, and encouraging discussions. He also would like to thank all his graduate students, postdocs, and the grant support from NSF CBET 1903362 , ARO W911NF-19-2-0127 , NASA NNX16AK07G , and DOE DE-SC0001198, DE- SC0021135 and DE-SC0020233 .
Publisher Copyright:
© 2020 The Combustion Institute.
PY - 2021
Y1 - 2021
N2 - Low-temperature flames such as cool flames, warm flames, double flames, and auto-ignition assisted flames play a critical role in the performance of advanced engines and fuel design. In this paper, an overview of the recent progresses in understanding low-temperature flames and dynamics as well as their impacts on combustion, advanced engines, and fuel development will be presented. Specifically, at first, a brief review of the history of cool flames is made. Then, the recent experimental studies and computational modeling of the flame structures, dynamics, and burning limits of non-premixed and premixed cool flames, warm flames, and double flames are presented. The flammability limit diagram and the temperature-dependent chain-branching reaction pathways, respectively, for hot, warm, and cool flames at elevated temperature and pressure will be discussed and analyzed. After that, the effect of low temperature auto-ignition of auto-igniting mixtures at high ignition Damköhler numbers at engine conditions on the propagation of cool flames, warm flames, and double flames as well as turbulent flames will be discussed. Finally, a new platform using low temperature flames for the development and validation of chemical kinetic models of alternative fuels will be presented. Discussions of future research of the dynamics and control of low temperature flames under engine conditions will be made.
AB - Low-temperature flames such as cool flames, warm flames, double flames, and auto-ignition assisted flames play a critical role in the performance of advanced engines and fuel design. In this paper, an overview of the recent progresses in understanding low-temperature flames and dynamics as well as their impacts on combustion, advanced engines, and fuel development will be presented. Specifically, at first, a brief review of the history of cool flames is made. Then, the recent experimental studies and computational modeling of the flame structures, dynamics, and burning limits of non-premixed and premixed cool flames, warm flames, and double flames are presented. The flammability limit diagram and the temperature-dependent chain-branching reaction pathways, respectively, for hot, warm, and cool flames at elevated temperature and pressure will be discussed and analyzed. After that, the effect of low temperature auto-ignition of auto-igniting mixtures at high ignition Damköhler numbers at engine conditions on the propagation of cool flames, warm flames, and double flames as well as turbulent flames will be discussed. Finally, a new platform using low temperature flames for the development and validation of chemical kinetic models of alternative fuels will be presented. Discussions of future research of the dynamics and control of low temperature flames under engine conditions will be made.
KW - Auto-ignition assisted flames
KW - Cool flames
KW - Double flames
KW - Low temperature combustion
KW - Warm flames
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U2 - 10.1016/j.proci.2020.09.019
DO - 10.1016/j.proci.2020.09.019
M3 - Conference article
AN - SCOPUS:85097385692
SN - 1540-7489
VL - 38
SP - 83
EP - 119
JO - Proceedings of the Combustion Institute
JF - Proceedings of the Combustion Institute
IS - 1
T2 - 38th International Symposium on Combustion, 2021
Y2 - 24 January 2021 through 29 January 2021
ER -