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Influence of precessing vortex core on flame flashback in swirling hydrogen flames

Schönborn, Alessandro LU ; Sayad, Parisa LU and Klingmann, Jens LU (2014) In International Journal of Hydrogen Energy 39(35). p.20233-20241
Abstract
This study examines the influence of vortex core precession on flame flashback of swirl-stabilised hydrogen flames. Theoretical considerations suggest that the angular velocity of a swirling flow is reduced as vortex precession causes it to acquire an eccentric motion around the central axis of the burner. The eccentric motion of the vortex generates a secondary flow, which is thought to reduce the angular velocity and tangential momentum available to the primary flow, and thereby reduce the flashback propensity at the centre of the vortex core. Experiments measuring the influence of the eccentric motion of the flame tip on flame flashback behaviour were conducted using high-speed sequences of OH*-chemiluminescence images. Temporal... (More)
This study examines the influence of vortex core precession on flame flashback of swirl-stabilised hydrogen flames. Theoretical considerations suggest that the angular velocity of a swirling flow is reduced as vortex precession causes it to acquire an eccentric motion around the central axis of the burner. The eccentric motion of the vortex generates a secondary flow, which is thought to reduce the angular velocity and tangential momentum available to the primary flow, and thereby reduce the flashback propensity at the centre of the vortex core. Experiments measuring the influence of the eccentric motion of the flame tip on flame flashback behaviour were conducted using high-speed sequences of OH*-chemiluminescence images. Temporal analysis of a large sample of images revealed the existence of a systematic rotational frequency of the flame tip around the central axis of the burner. Analysis of the radial position of the flame tip in relation to its axial propagation velocity showed that flashback velocity increased as the flame tip eccentricity approached zero and flashback velocity decreased as the eccentricity amplitude of the flame tip reached larger values. This suggested that flame eccentricity caused by vortex core precession may be detrimental to upstream flame propagation and may be effective in inhibiting flame flashback in swirl-stabilised flames. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Hydrogen, Flashback, Gas turbine, Precessing vortex core (PVC), OH-chemiluminescence
in
International Journal of Hydrogen Energy
volume
39
issue
35
pages
20233 - 20241
publisher
Elsevier
external identifiers
  • wos:000347017200039
  • scopus:84913605933
ISSN
1879-3487
DOI
10.1016/j.ijhydene.2014.10.005
language
English
LU publication?
yes
id
aefd24f7-dbb5-439d-9bbd-16bb42e71c92 (old id 5085347)
date added to LUP
2015-02-26 12:58:10
date last changed
2017-03-26 03:56:41
@article{aefd24f7-dbb5-439d-9bbd-16bb42e71c92,
  abstract     = {This study examines the influence of vortex core precession on flame flashback of swirl-stabilised hydrogen flames. Theoretical considerations suggest that the angular velocity of a swirling flow is reduced as vortex precession causes it to acquire an eccentric motion around the central axis of the burner. The eccentric motion of the vortex generates a secondary flow, which is thought to reduce the angular velocity and tangential momentum available to the primary flow, and thereby reduce the flashback propensity at the centre of the vortex core. Experiments measuring the influence of the eccentric motion of the flame tip on flame flashback behaviour were conducted using high-speed sequences of OH*-chemiluminescence images. Temporal analysis of a large sample of images revealed the existence of a systematic rotational frequency of the flame tip around the central axis of the burner. Analysis of the radial position of the flame tip in relation to its axial propagation velocity showed that flashback velocity increased as the flame tip eccentricity approached zero and flashback velocity decreased as the eccentricity amplitude of the flame tip reached larger values. This suggested that flame eccentricity caused by vortex core precession may be detrimental to upstream flame propagation and may be effective in inhibiting flame flashback in swirl-stabilised flames. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.},
  author       = {Schönborn, Alessandro and Sayad, Parisa and Klingmann, Jens},
  issn         = {1879-3487},
  keyword      = {Hydrogen,Flashback,Gas turbine,Precessing vortex core (PVC),OH-chemiluminescence},
  language     = {eng},
  number       = {35},
  pages        = {20233--20241},
  publisher    = {Elsevier},
  series       = {International Journal of Hydrogen Energy},
  title        = {Influence of precessing vortex core on flame flashback in swirling hydrogen flames},
  url          = {http://dx.doi.org/10.1016/j.ijhydene.2014.10.005},
  volume       = {39},
  year         = {2014},
}