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Planar laser-induced fluorescence of HCO for instantaneous flame front imaging in hydrocarbon flames

Kiefer, J; Li, Zhongshan LU ; Seeger, T.; Leipertz, A. and Aldén, Marcus LU (2009) In Proceedings of the Combustion Institute2000-01-01+01:00 32. p.921-928
Abstract
The detection of the formyl radical (HCO) is of great interest in the field of combustion research since it can provide information about the local heat release (HR) rate which is a key parameter in the understanding of combustion processes. Unfortunately, due to the low signal level, HCO planar laser-induced fluorescence (PLTF) has so far not been applicable for single-shot imaging, which is necessary in particular for studying turbulent flames. In the present paper for the first time, to the best of our knowledge, single-shot PLIF imaging of HCO in flames is demonstrated by employing-a multimode frequency-tripled alexandrite laser. Oil the basis of long pulse duration along with a spectrally broad bandwidth enabling multi-line excitation... (More)
The detection of the formyl radical (HCO) is of great interest in the field of combustion research since it can provide information about the local heat release (HR) rate which is a key parameter in the understanding of combustion processes. Unfortunately, due to the low signal level, HCO planar laser-induced fluorescence (PLTF) has so far not been applicable for single-shot imaging, which is necessary in particular for studying turbulent flames. In the present paper for the first time, to the best of our knowledge, single-shot PLIF imaging of HCO in flames is demonstrated by employing-a multimode frequency-tripled alexandrite laser. Oil the basis of long pulse duration along with a spectrally broad bandwidth enabling multi-line excitation a sufficient signal-to-noise ratio is achieved. In detail, excitation in the B-X system around 258.69 nm is applied and subsequent fluorescence detection in the spectral range 300-400 nm is performed. A series of experiments concerning spectral interferences, saturation behavior and the influence of flame stoichiometry (in the range phi = 0.6-2) have been conducted. Two typical fuels have been employed: methane (CH4) as conventional hydrocarbon as well as dimethyl ether (DME) as modern bio fuel. Single-shot HCO imaging is finally demonstrated in a laminar DME/air Bunsen flame and in a slightly turbulent methane/oxygen welding torch flame. The results indicate that the developed HCO PLIF technique offers a strong potential for improved flame Studies particularly in turbulent flames, In general, the approach to employ laser sources with reasonably broader bandwidth and longer pulse duration compared to conventional Nd:YAG pumped systems for PLIF will open up new possibilities in the field of Combustion diagnostics. (c) 2009 The Combustion Institute. Published by Elsevier file. All rights reserved. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
fluorescence, Planar laser-induced, HCO radical, Flame front, Heat release rate, Single-shot imaging
in
Proceedings of the Combustion Institute2000-01-01+01:00
volume
32
pages
921 - 928
publisher
Elsevier
external identifiers
  • wos:000264756800104
  • scopus:67649295395
ISSN
1540-7489
DOI
10.1016/j.proci.2008.05.013
language
English
LU publication?
yes
id
11d8ee92-b65b-4b4d-bfcd-bbee39f4ef32 (old id 1400895)
date added to LUP
2009-06-12 10:06:49
date last changed
2017-11-19 03:27:01
@article{11d8ee92-b65b-4b4d-bfcd-bbee39f4ef32,
  abstract     = {The detection of the formyl radical (HCO) is of great interest in the field of combustion research since it can provide information about the local heat release (HR) rate which is a key parameter in the understanding of combustion processes. Unfortunately, due to the low signal level, HCO planar laser-induced fluorescence (PLTF) has so far not been applicable for single-shot imaging, which is necessary in particular for studying turbulent flames. In the present paper for the first time, to the best of our knowledge, single-shot PLIF imaging of HCO in flames is demonstrated by employing-a multimode frequency-tripled alexandrite laser. Oil the basis of long pulse duration along with a spectrally broad bandwidth enabling multi-line excitation a sufficient signal-to-noise ratio is achieved. In detail, excitation in the B-X system around 258.69 nm is applied and subsequent fluorescence detection in the spectral range 300-400 nm is performed. A series of experiments concerning spectral interferences, saturation behavior and the influence of flame stoichiometry (in the range phi = 0.6-2) have been conducted. Two typical fuels have been employed: methane (CH4) as conventional hydrocarbon as well as dimethyl ether (DME) as modern bio fuel. Single-shot HCO imaging is finally demonstrated in a laminar DME/air Bunsen flame and in a slightly turbulent methane/oxygen welding torch flame. The results indicate that the developed HCO PLIF technique offers a strong potential for improved flame Studies particularly in turbulent flames, In general, the approach to employ laser sources with reasonably broader bandwidth and longer pulse duration compared to conventional Nd:YAG pumped systems for PLIF will open up new possibilities in the field of Combustion diagnostics. (c) 2009 The Combustion Institute. Published by Elsevier file. All rights reserved.},
  author       = {Kiefer, J and Li, Zhongshan and Seeger, T. and Leipertz, A. and Aldén, Marcus},
  issn         = {1540-7489},
  keyword      = {fluorescence,Planar laser-induced,HCO radical,Flame front,Heat release rate,Single-shot imaging},
  language     = {eng},
  pages        = {921--928},
  publisher    = {Elsevier},
  series       = {Proceedings of the Combustion Institute2000-01-01+01:00},
  title        = {Planar laser-induced fluorescence of HCO for instantaneous flame front imaging in hydrocarbon flames},
  url          = {http://dx.doi.org/10.1016/j.proci.2008.05.013},
  volume       = {32},
  year         = {2009},
}