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Cool-flame extinction during n-alkane droplet combustion in microgravity☆

Published on May 1, 2015in Combustion and Flame4.12
· DOI :10.1016/j.combustflame.2015.01.012
Vedha Nayagam4
Estimated H-index: 4
(Case Western Reserve University),
Daniel L. Dietrich13
Estimated H-index: 13
(Glenn Research Center)
+ 1 AuthorsForman A. Williams48
Estimated H-index: 48
(UCSD: University of California, San Diego)
Abstract
Abstract Recent droplet-combustion experiments onboard the International Space Station (ISS) have revealed that large n-alkane droplets, following radiative extinction of the visible flame, can continue to burn quasi-steadily in a low-temperature regime, characterized by negative-temperature-coefficient (NTC) chemistry. In this study we report experimental observations of n-heptane, n-octane, and n-decane droplets of varying initial size burning in oxygen/nitrogen, oxygen/nitrogen/carbon dioxide, and oxygen/nitrogen/helium environments at pressures from 0.5 to 1.0 atm, with oxygen concentrations from 14% to 25% by volume. These large n-alkane droplets exhibited radiative extinction of the hot flame, followed by quasi-steady low-temperature burning, which terminated with diffusive extinction accompanied by the formation of a vapor cloud, while small droplets did not exhibit radiative extinction but instead burned to completion or disruptively extinguished. Results for droplet burning rates in both the hot-flame and cool-flame regimes, as well as droplet extinction diameters at the end of each stage, are presented. The cool-flame extinction diameters for all three n-alkanes are shown to follow a similar trend as functions of the oxygen concentration, predicted here from a simplified theoretical model that is based on the reaction-rate parameters for the oxygen molecule addition to the alkyl radical and for ketohydroperoxide decomposition.
  • References (19)
  • Citations (28)
References19
Newest
#1Tanvir Farouk (USC: University of South Carolina)H-Index: 17
#2Michael C. Hicks (Glenn Research Center)H-Index: 8
Last.Frederick L. Dryer (Princeton University)H-Index: 66
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#1Daniel L. Dietrich (Glenn Research Center)H-Index: 13
#2Vedha Nayagam (Case Western Reserve University)H-Index: 4
Last.Yu Cheng Liu (Cornell University)H-Index: 10
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#1Guenter Paczko (RWTH Aachen University)H-Index: 2
#2N. Peters (RWTH Aachen University)H-Index: 56
Last.Forman A. Williams (UCSD: University of California, San Diego)H-Index: 48
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#1Alberto CuociH-Index: 27
#2Alessio FrassoldatiH-Index: 34
Last.E. RanziH-Index: 49
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#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
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#1Justin Dzik (Glenn Research Center)H-Index: 1
#2Vedha Nayagam (Glenn Research Center)H-Index: 13
Last.Forman A. Williams (UCSD: University of California, San Diego)H-Index: 48
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#1Yiguang Ju (Princeton University)H-Index: 54
#2Christopher B. Reuter (Princeton University)H-Index: 7
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#1Mohammadhadi Hajilou (UW: University of Wyoming)H-Index: 2
#2Matthew Q. Brown (UW: University of Wyoming)
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#1Forman A. Williams (UCSD: University of California, San Diego)H-Index: 48
#2Vedha Nayagam (Case Western Reserve University)H-Index: 13
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#1Minhyeok Lee (UTokyo: University of Tokyo)H-Index: 2
#2Yong Fan (UTokyo: University of Tokyo)H-Index: 5
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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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#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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#1Wenkai Liang (Princeton University)H-Index: 8
#2R. Mével (THU: Tsinghua University)H-Index: 12
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#1A. Markan (UMD: University of Maryland, College Park)H-Index: 1
#2Peter B. Sunderland (UMD: University of Maryland, College Park)H-Index: 19
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