Match!

Isolated n-decane droplet combustion – Dual stage and single stage transition to “Cool Flame” droplet burning

Published on Jan 1, 2017
· DOI :10.1016/j.proci.2016.07.015
Tanvir I. Farouk4
Estimated H-index: 4
(USC: University of South Carolina),
Daniel L. Dietrich13
Estimated H-index: 13
(Glenn Research Center)
+ 1 AuthorsFrederick L. Dryer4
Estimated H-index: 4
(Princeton University)
Abstract
Abstract Observations of “ Cool Flame ” burning for large diameter isolated droplets on board the International Space Station have stimulated interest in combustion initiation/generation of non-premixed combustion modes. For a number of n -alkane fuels at large initial droplet diameters, the initiation process was observed to first establish a hot flame condition that radiatively extinguished, followed by a quasi-steady, “ Cool Flame ” droplet burning mode. However, recent large diameter n -decane experiments show that depending on the ignition energy supplied, the first stage hot flame condition was absent, with an apparent, direct establishment of a “ Cool Flame ” burning mode that continued to diffusive extinction. Here we report these experimental observations and elucidate the underlying parameters resulting in dual and single stage “ Cool Flame ” burning. Detailed, transient sphero-symmetric droplet combustion modeling is applied to interpret the experiments. The simulations indicate that the balance and duration of the ignition energy applied, the energy release associated with reaction of partially premixed fuel vapor surrounding the droplet, heat flux to the drop surface, and far field diffusive heat loss all play key roles as to whether a dual stage, radiatively extinguished hot-flame-to- Cool - Flame -transition for only large droplets or direct establishment of “ Cool Flame ” burning for all droplet sizes occurs. The rate at which the reactive partially premixed vapor layer surrounding the droplet is formed, its volume, and its subsequent reaction significantly influence the observed transition to “ Cool Flame ” burning. The initial droplet temperature relative to saturation and flash point temperatures of the fuel and the liquid phase heat capacity contribute to the thermal transport requirement at the droplet surface for establishing the partially premixed reactive layer surrounding the droplet, which through its reaction history defines whether a transition to “ Cool Flame ” burning can be initiated without a requirement for radiative extinction of a hot flame burning mode.
  • References (18)
  • Citations (11)
References18
Newest
#1Alberto Cuoci (Polytechnic University of Milan)H-Index: 27
#2Alessio Frassoldati (Polytechnic University of Milan)H-Index: 34
Last.E. Ranzi (Polytechnic University of Milan)H-Index: 49
view all 4 authors...
#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
view all 3 authors...
#1Daniel L. Dietrich (Glenn Research Center)H-Index: 13
#2Vedha Nayagam (Case Western Reserve University)H-Index: 4
Last.Forman A. Williams (UCSD: University of California, San Diego)H-Index: 48
view all 12 authors...
#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...
Cited By11
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 0 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 2 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...
#1Alessandro Stagni (Polytechnic University of Milan)H-Index: 8
#2Alberto Cuoci (Polytechnic University of Milan)H-Index: 27
Last.T. Faravelli (Polytechnic University of Milan)H-Index: 43
view all 5 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...
#1Alessandro Stagni (Polytechnic University of Milan)H-Index: 8
#2Davide Brignoli (Polytechnic University of Milan)
Last.T. Faravelli (Polytechnic University of Milan)H-Index: 43
view all 7 authors...
View next paperCan cool flames support quasi-steady alkane droplet burning?