Match!

Thermo-kinetic dynamics of near-limit cool diffusion flames

Published on Jan 1, 2017
· DOI :10.1016/j.proci.2016.05.049
Chae Hoon Sohn15
Estimated H-index: 15
(Sejong University),
Hee Sun Han1
Estimated H-index: 1
(Sejong University)
+ 2 AuthorsSang Hee Won30
Estimated H-index: 30
(Princeton University)
Abstract
Abstract The dynamics of near-limit cool diffusion flames are investigated experimentally and numerically by studying transient flame evolution and instability. In order to observe the effects of chemistry-transport coupling on ignition and instability in a cool diffusion flame, diffusion flames of n-heptane and pure oxygen are sensitized by ozone in a counterflow burner. First, it is found from experimental observations that the immediate addition of ozone to the oxidizer side of a frozen flow either initiates a cool diffusion flame or triggers a two-stage ignition into a hot flame. Second, a cool flame near its extinction limit can be destabilized by a perturbation of the fuel mole fraction, eventually leading to flame extinction. The recorded flame chemiluminescence signals reveal repeated flame oscillations before extinction. Next, details of the transient dynamics of near-limit cool diffusion flames are explored through numerical calculations by adopting the same perturbation method. Experimental observations of unsteady flame initiation and instability are simulated, and it is found that the ignition process is highly sensitive to the perturbed ozone mole fraction and that the ignition delay times in a counterflow configuration are significantly affected by the diffusive transport of species with high concentration. The instability mechanism of a cool flame is found to be distinct from that of diffusive-thermal instability. The results show that the instability behavior of a cool flame is a thermo-kinetic instability, which is triggered and controlled by the chemical kinetics associated with the OH radical population in the negative temperature coefficient chemical kinetic regime coupled with heat production and loss.
  • References (36)
  • Citations (9)
References36
Newest
#1Christopher B. Reuter (Princeton University)H-Index: 8
#2Sang Hee Won (Princeton University)H-Index: 30
Last.Yiguang Ju (Princeton University)H-Index: 57
view all 3 authors...
33 CitationsSource
#1Peng Zhao (Princeton University)H-Index: 12
#2Wenkai Liang (Princeton University)H-Index: 8
Last.Chung King Law (Princeton University)H-Index: 81
view all 4 authors...
36 CitationsSource
#1Shamel S. Merchant (MIT: Massachusetts Institute of Technology)H-Index: 9
#2C. Franklin Goldsmith (Brown University)H-Index: 14
Last.William H. Green (MIT: Massachusetts Institute of Technology)H-Index: 48
view all 6 authors...
55 CitationsSource
#1Yiguang Ju (Princeton University)H-Index: 57
#2Christopher B. Reuter (Princeton University)H-Index: 8
Last.Sang Hee Won (Princeton University)H-Index: 30
view all 3 authors...
41 CitationsSource
#1Chae Hoon Sohn (Sejong University)H-Index: 15
#2Jin Woo Son (Sejong University)H-Index: 1
Last.Yiguang Ju (Princeton University)H-Index: 57
view all 4 authors...
6 CitationsSource
#1Rolf D. Reitz (UW: University of Wisconsin-Madison)H-Index: 77
#2Ganesh Duraisamy (Anna University)H-Index: 2
372 CitationsSource
#1Sang Hee Won (Princeton University)H-Index: 30
#2Bo Jiang (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 3
Last.Yiguang Ju (Princeton University)H-Index: 57
view all 5 authors...
56 CitationsSource
#1Frederick L. Dryer (Princeton University)H-Index: 68
80 CitationsSource
#1Tanvir Farouk (USC: University of South Carolina)H-Index: 18
#2Michael C. Hicks (Glenn Research Center)H-Index: 8
Last.Frederick L. Dryer (Princeton University)H-Index: 68
view all 3 authors...
40 CitationsSource
#1Tanvir Farouk (USC: University of South Carolina)H-Index: 18
#2Frederick L. Dryer (Princeton University)H-Index: 68
59 CitationsSource
Cited By9
Newest
#1Yiguang Ju (Princeton University)H-Index: 57
#2Christopher B. Reuter (Princeton University)H-Index: 8
Last.Sang Hee Won (USC: University of South Carolina)H-Index: 3
view all 5 authors...
1 CitationsSource
#1Mohammadhadi Hajilou (UW: University of Wyoming)H-Index: 3
#2Matthew Q. Brown (UW: University of Wyoming)
Last.Erica Belmont (UW: University of Wyoming)H-Index: 6
view all 4 authors...
Source
#1Jie Chen (Chongqing University)H-Index: 1
#2Yinhu Kang (Chongqing University)H-Index: 10
Last.Lin MeiH-Index: 3
view all 10 authors...
1 CitationsSource
#1Eric Lin (Princeton University)H-Index: 1
#2Christopher B. Reuter (Princeton University)H-Index: 8
Last.Yiguang Ju (Princeton University)H-Index: 57
view all 3 authors...
1 CitationsSource
#1Omar R. Yehia (Princeton University)H-Index: 2
#2Christopher B. Reuter (Princeton University)H-Index: 8
Last.Yiguang Ju (Princeton University)H-Index: 57
view all 3 authors...
7 CitationsSource
#1Christopher B. Reuter (Princeton University)H-Index: 8
#2Minhyeok Lee (Princeton University)H-Index: 2
Last.Yiguang Ju (Princeton University)H-Index: 57
view all 4 authors...
19 CitationsSource
#1Yiguang Ju (Princeton University)H-Index: 57
20 CitationsSource
#1Mohammadhadi Hajilou (UW: University of Wyoming)H-Index: 3
#2Timothy Ombrello (AFRL: Air Force Research Laboratory)H-Index: 13
Last.Erica Belmont (UW: University of Wyoming)H-Index: 6
view all 4 authors...
11 CitationsSource
#2Minhyeok LeeH-Index: 2
Last.Yiguang JuH-Index: 57
view all 4 authors...
Source