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Hysteretic Dynamics of Flashback in a Low-Swirl Stabilized Combustor

Szasz, R. LU ; Subash, A. A. LU ; Lantz, A. LU ; Collin, R. LU ; Fuchs, L. LU and Gutmark, E. (2017) In Combustion Science and Technology 189(2). p.266-289
Abstract

The hysteretic behavior of flashback (FB) and flash forward (FF) in methane and natural gas flames, stabilized by a low swirl fuel injector, is investigated using high speed OH* chemiluminescence and particle image velocimetry. Due to the lack of vortex breakdown, the two mechanisms discussed are boundary layer and turbulence induced FB. Two hysteresis cycles were identified, one when FB is induced by increasing the equivalence ratio starting from lean conditions, and the other by decreasing the equivalence ratio starting from rich conditions. Impact of relevant parameters including Reynolds number (Re), equivalence ratio, fuel type, combustion chamber geometry, preheating, and mixing tube protrusions are investigated. As Re is... (More)

The hysteretic behavior of flashback (FB) and flash forward (FF) in methane and natural gas flames, stabilized by a low swirl fuel injector, is investigated using high speed OH* chemiluminescence and particle image velocimetry. Due to the lack of vortex breakdown, the two mechanisms discussed are boundary layer and turbulence induced FB. Two hysteresis cycles were identified, one when FB is induced by increasing the equivalence ratio starting from lean conditions, and the other by decreasing the equivalence ratio starting from rich conditions. Impact of relevant parameters including Reynolds number (Re), equivalence ratio, fuel type, combustion chamber geometry, preheating, and mixing tube protrusions are investigated. As Re is increased, the equivalence ratio at which both rich and lean flashbacks occur approaches stoichiometric conditions. However, the range of the hysteresis cycle between FB and FF is independent on Re. The transition processes during FB and FF are quite variable and their duration is independent on Re. The mean duration of FB transition initiated from lean conditions is nearly twice longer than the rich branch and also longer than both the lean and rich FF. The geometry of the combustion chamber affected neither FB nor FF. However, preheating increased the equivalence ratio at which FB occurred but did not affect FF. Also, FB had significant effect on the mean flow field.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Flash forward, Flashback, Hysteresis; Premixed, Swirl
in
Combustion Science and Technology
volume
189
issue
2
pages
24 pages
publisher
Taylor & Francis
external identifiers
  • scopus:85007144844
  • wos:000393682900005
ISSN
0010-2202
DOI
10.1080/00102202.2016.1206895
language
English
LU publication?
yes
id
aadb0efe-c001-4609-8184-955a9dc48c4b
date added to LUP
2017-02-03 12:49:44
date last changed
2018-01-07 11:48:04
@article{aadb0efe-c001-4609-8184-955a9dc48c4b,
  abstract     = {<p>The hysteretic behavior of flashback (FB) and flash forward (FF) in methane and natural gas flames, stabilized by a low swirl fuel injector, is investigated using high speed OH* chemiluminescence and particle image velocimetry. Due to the lack of vortex breakdown, the two mechanisms discussed are boundary layer and turbulence induced FB. Two hysteresis cycles were identified, one when FB is induced by increasing the equivalence ratio starting from lean conditions, and the other by decreasing the equivalence ratio starting from rich conditions. Impact of relevant parameters including Reynolds number (Re), equivalence ratio, fuel type, combustion chamber geometry, preheating, and mixing tube protrusions are investigated. As Re is increased, the equivalence ratio at which both rich and lean flashbacks occur approaches stoichiometric conditions. However, the range of the hysteresis cycle between FB and FF is independent on Re. The transition processes during FB and FF are quite variable and their duration is independent on Re. The mean duration of FB transition initiated from lean conditions is nearly twice longer than the rich branch and also longer than both the lean and rich FF. The geometry of the combustion chamber affected neither FB nor FF. However, preheating increased the equivalence ratio at which FB occurred but did not affect FF. Also, FB had significant effect on the mean flow field.</p>},
  author       = {Szasz, R. and Subash, A. A. and Lantz, A. and Collin, R. and Fuchs, L. and Gutmark, E.},
  issn         = {0010-2202},
  keyword      = {Flash forward,Flashback,Hysteresis; Premixed,Swirl},
  language     = {eng},
  month        = {02},
  number       = {2},
  pages        = {266--289},
  publisher    = {Taylor & Francis},
  series       = {Combustion Science and Technology},
  title        = {Hysteretic Dynamics of Flashback in a Low-Swirl Stabilized Combustor},
  url          = {http://dx.doi.org/10.1080/00102202.2016.1206895},
  volume       = {189},
  year         = {2017},
}