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Ignition and extinction of strained nonpremixed cool flames at elevated pressures

Published on Feb 1, 2017in Combustion and Flame4.12
· DOI :10.1016/j.combustflame.2016.10.015
Sili Deng6
Estimated H-index: 6
(Princeton University),
Dong Han11
Estimated H-index: 11
(Princeton University),
Chung K. Law77
Estimated H-index: 77
(Princeton University)
Abstract
Abstract Cool flames, governed by low-temperature chemistry, are closely related to engine knock. Since the low-temperature chemical kinetics is promoted at elevated pressures, the ignition and extinction of nonpremixed cool flame at elevated pressures were experimentally and computationally investigated herein in the counterflow. Specifically, the hysteretic ignition and extinction behavior of the nonpremixed cool flame was for the first time observed and quantified. S-curve analysis was conducted to demonstrate the thermal and chemical structure of the cool flame and to elucidate the dominant chemical pathways during the ignition and extinction processes. The dominant low-temperature chemical reactions shift from those responsible for radical runaway to exothermic reactions that sustain the cool flame. Increasing the ambient pressure and/or the oxygen concentration in the oxidizer stream promote the heat release from the cool flame, and hence, result in an extended hysteresis temperature window between ignition and extinction. It is further noted that while the observed cool flame ignition temperatures were well predicted by computation, significant discrepancies existed for the extinction temperatures based on the well-adopted reaction mechanism used. Possible reasons were discussed to facilitate further cool flame studies and the development of the low-temperature chemistry.
  • References (42)
  • Citations (16)
References42
Newest
#1Sili Deng (Princeton University)H-Index: 6
#2Peng Zhao (UR: University of Rochester)H-Index: 10
Last.Chung K. Law (Princeton University)H-Index: 77
view all 4 authors...
#1Peng Zhao (Princeton University)H-Index: 10
#2Wenkai Liang (Princeton University)H-Index: 8
Last.Chung K. Law (Princeton University)H-Index: 77
view all 4 authors...
#1Yiguang Ju (Princeton University)H-Index: 54
#2Joseph K. Lefkowitz (Princeton University)H-Index: 9
Last.Qi Chen (Beijing Jiaotong University)H-Index: 2
view all 9 authors...
#1Sili Deng (Princeton University)H-Index: 6
#2Peng Zhao (Princeton University)H-Index: 10
Last.Chung K. Law (Princeton University)H-Index: 77
view all 4 authors...
#1Sili Deng (Princeton University)H-Index: 6
#2Peng Zhao (Princeton University)H-Index: 10
Last.Chung K. Law (Princeton University)H-Index: 77
view all 4 authors...
#1Vedha Nayagam (Case Western Reserve University)H-Index: 4
#2Daniel L. Dietrich (Glenn Research Center)H-Index: 13
Last.Forman A. Williams (UCSD: University of California, San Diego)H-Index: 48
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#1Ultan Burke (National University of Ireland, Galway)H-Index: 9
#2Kieran P. Somers (National University of Ireland, Galway)H-Index: 12
Last.Henry J. Curran (National University of Ireland, Galway)H-Index: 59
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#1Shogo Kikui (Tohoku University)H-Index: 2
#2Taiki Kamada (Tohoku University)H-Index: 2
Last.Kaoru Maruta (Tohoku University)H-Index: 34
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#1Sang Hee Won (Princeton University)H-Index: 27
#2Bo Jiang (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 3
Last.Yiguang Ju (Princeton University)H-Index: 54
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Cited By16
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#1Yiguang Ju (Princeton University)H-Index: 54
#2Christopher B. Reuter (Princeton University)H-Index: 7
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#1Omar R. Yehia (Princeton University)H-Index: 2
#2Christopher B. Reuter (Princeton University)H-Index: 7
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#1Yang Zhang (THU: Tsinghua University)H-Index: 11
#2Xiehe Yang (THU: Tsinghua University)
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#1Gerald Mairinger (UCSD: University of California, San Diego)H-Index: 2
#2Rohit Sanjay Khare (Indian Institute of Technology Madras)
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#1Zhichao Zhang (ZJU: Zhejiang University)H-Index: 1
#2Longfei Chen (Beihang University)H-Index: 16
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#1Alex G. Novoselov (Princeton University)
#2Chung K. Law (Princeton University)H-Index: 77
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#1Eric Lin (Princeton University)H-Index: 1
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#1Fahd E. Alam (USC: University of South Carolina)H-Index: 4
#2Ali Charchi Aghdam (USC: University of South Carolina)
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