Match!

Multistage oscillatory “Cool Flame” behavior for isolated alkane droplet combustion in elevated pressure microgravity condition

Published on Jan 1, 2015
· DOI :10.1016/j.proci.2014.06.015
Tanvir Farouk17
Estimated H-index: 17
(USC: University of South Carolina),
Michael C. Hicks8
Estimated H-index: 8
(Glenn Research Center),
Frederick L. Dryer66
Estimated H-index: 66
(Princeton University)
Cite
Abstract
Abstract Recently, large diameter, isolated n -heptane droplet experiments under microgravity conditions (aboard the International Space Station) exhibited “ Cool Flame ” burning behavior, resulting from a heat loss mechanism that extinguishes hot combustion and a transition into a sustained, low temperature second stage combustion. In atmospheric pressure air, a single combustion mode transition to “ Cool Flame ” burning is followed by diffusive extinction. But with increasing pressure, multiple cycles of hot initiation followed by transition to “ Cool Flame ” burning are observed. This paper reports experimental observations that characterize the transition time histories of this multi-cycle, multi-stage behavior. Transient sphero-symmetric droplet combustion modeling that considers multi-stage detailed kinetics, multi-component diffusion, and spectral radiation is applied to analyze the experimental observations. The simulations indicate that as parameters change the chemical time scales dictating low temperature degenerate chain branching, multiple hot/cool flame burning transitions are induced by increasing the cool flame burning heat generation rate compared to the diffusive loss rate. The balance of these terms in the negative temperature coefficient kinetic regime defines whether reactions accelerate into re-ignition of a hot flame event, burn quasi-steadily in the cool flame mode, or diffusively extinguish. The rate of reactions controlling ketohydroperoxide formation and destruction are shown to be key re-ignition of hot combustion from the cool flame mode. Predictions are found to be in good agreement with the experimental measurements. Modeling is further applied to determine how these observations are dependent on initial experimental conditions, including pressure, and diluent species.
  • References (20)
  • Citations (36)
Cite
References20
Newest
#1Tanvir Farouk (Princeton University)H-Index: 17
#2Yu Cheng Liu (Cornell University)H-Index: 10
Last.Frederick L. Dryer (Princeton University)H-Index: 66
view all 5 authors...
#1Vedha NayagamH-Index: 13
#2Daniel L. Dietrich (Glenn Research Center)H-Index: 13
Last.Forman A. Williams (UCSD: University of California, San Diego)H-Index: 48
view all 5 authors...
#1Saeed Jahangirian (Princeton University)H-Index: 7
#2Stephen Dooley (Princeton University)H-Index: 23
Last.Frederick L. Dryer (Princeton University)H-Index: 66
view all 4 authors...
#1Charles K. Westbrook (LLNL: Lawrence Livermore National Laboratory)H-Index: 62
#2William J. Pitz (LLNL: Lawrence Livermore National Laboratory)H-Index: 56
Last.E J Silke (LLNL: Lawrence Livermore National Laboratory)H-Index: 8
view all 5 authors...
#1Zheng Chen (Princeton University)H-Index: 30
#2Xiao Qin (Princeton University)H-Index: 7
Last.Fengshan Liu (National Research Council)H-Index: 1
view all 5 authors...
#1Alberto Cuoci (Polytechnic University of Milan)H-Index: 27
#2Marco Mehl (Polytechnic University of Milan)H-Index: 27
Last.E. Ranzi (Polytechnic University of Milan)H-Index: 7
view all 6 authors...
Cited By36
Newest
#1Yiguang Ju (Princeton University)H-Index: 54
#2Christopher B. Reuter (Princeton University)H-Index: 7
Last.Sang Hee Won (USC: University of South Carolina)H-Index: 3
view all 5 authors...
#1Mohammadhadi Hajilou (UW: University of Wyoming)H-Index: 2
#2Matthew Q. Brown (UW: University of Wyoming)
Last.Erica Belmont (UW: University of Wyoming)H-Index: 5
view all 4 authors...
#1Forman A. Williams (UCSD: University of California, San Diego)H-Index: 48
#2Vedha Nayagam (Case Western Reserve University)H-Index: 13
Last.Vedha Nayagam (Case Western Reserve University)H-Index: 4
view all 3 authors...
#1Yang Zhang (THU: Tsinghua University)H-Index: 11
#2Xiehe Yang (THU: Tsinghua University)
Last.Junfu Lyu (THU: Tsinghua University)H-Index: 3
view all 6 authors...
#1Eric Lin (Princeton University)H-Index: 1
#2Christopher B. Reuter (Princeton University)H-Index: 7
Last.Yiguang Ju (Princeton University)H-Index: 54
view all 3 authors...
#1Fahd E. Alam (USC: University of South Carolina)H-Index: 4
#2Sang Hee Won (USC: University of South Carolina)H-Index: 3
Last.Tanvir Farouk (USC: University of South Carolina)H-Index: 17
view all 4 authors...
#1Omar R. Yehia (Princeton University)H-Index: 2
#2Christopher B. Reuter (Princeton University)H-Index: 7
Last.Yiguang Ju (Princeton University)H-Index: 54
view all 3 authors...
View next paperCan cool flames support quasi-steady alkane droplet burning?