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In situ determination of N-2 broadening coefficients in flames for rotational CARS thermometry

Gao, Yi ; Bohlin, Alexis LU ; Seeger, Thomas ; Bengtsson, Per-Erik LU orcid and Kliewer, Christopher J. (2013) In Proceedings of the Combustion Institute 34. p.3637-3644
Abstract
Total N-2 S-branch broadening coefficients have been measured in situ as a function of radial position in a highly sooting ethylene diffusion flame by the use of time-resolved dual-broadband picosecond pure rotational CARS (RCARS). Time-domain measurements of the J-dependent N-2 rotational coherence decays in the flame were used to determine the broadening coefficients, and these coefficients were then used in the spectral fitting routine for the determination of temperature and [O-2]/[N-2] ratio in the flame. Corrections of up to 125 K are found when compared to spectral fitting using an ECS self-broadened N-2 linewidth model. The presented technique effectively takes into account contributions to the N-2 linewidths from all collision... (More)
Total N-2 S-branch broadening coefficients have been measured in situ as a function of radial position in a highly sooting ethylene diffusion flame by the use of time-resolved dual-broadband picosecond pure rotational CARS (RCARS). Time-domain measurements of the J-dependent N-2 rotational coherence decays in the flame were used to determine the broadening coefficients, and these coefficients were then used in the spectral fitting routine for the determination of temperature and [O-2]/[N-2] ratio in the flame. Corrections of up to 125 K are found when compared to spectral fitting using an ECS self-broadened N-2 linewidth model. The presented technique effectively takes into account contributions to the N-2 linewidths from all collision partners without any a priori knowledge of relative species concentrations. Published by Elsevier Inc. on behalf of The Combustion Institute. (Less)
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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Time-resolved spectroscopy, Raman linewidths, CARS, Ultrafast, Soot
in
Proceedings of the Combustion Institute
volume
34
pages
3637 - 3644
publisher
Elsevier
external identifiers
  • wos:000313131800198
  • scopus:84872017274
ISSN
1540-7489
DOI
10.1016/j.proci.2012.05.010
language
English
LU publication?
yes
id
ed43e65a-f583-4f04-bc64-90d5a69b5069 (old id 3476876)
date added to LUP
2016-04-01 10:11:24
date last changed
2022-03-04 17:00:35
@article{ed43e65a-f583-4f04-bc64-90d5a69b5069,
  abstract     = {{Total N-2 S-branch broadening coefficients have been measured in situ as a function of radial position in a highly sooting ethylene diffusion flame by the use of time-resolved dual-broadband picosecond pure rotational CARS (RCARS). Time-domain measurements of the J-dependent N-2 rotational coherence decays in the flame were used to determine the broadening coefficients, and these coefficients were then used in the spectral fitting routine for the determination of temperature and [O-2]/[N-2] ratio in the flame. Corrections of up to 125 K are found when compared to spectral fitting using an ECS self-broadened N-2 linewidth model. The presented technique effectively takes into account contributions to the N-2 linewidths from all collision partners without any a priori knowledge of relative species concentrations. Published by Elsevier Inc. on behalf of The Combustion Institute.}},
  author       = {{Gao, Yi and Bohlin, Alexis and Seeger, Thomas and Bengtsson, Per-Erik and Kliewer, Christopher J.}},
  issn         = {{1540-7489}},
  keywords     = {{Time-resolved spectroscopy; Raman linewidths; CARS; Ultrafast; Soot}},
  language     = {{eng}},
  pages        = {{3637--3644}},
  publisher    = {{Elsevier}},
  series       = {{Proceedings of the Combustion Institute}},
  title        = {{In situ determination of N-2 broadening coefficients in flames for rotational CARS thermometry}},
  url          = {{http://dx.doi.org/10.1016/j.proci.2012.05.010}},
  doi          = {{10.1016/j.proci.2012.05.010}},
  volume       = {{34}},
  year         = {{2013}},
}