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Dual-broadband rotational CARS thermometry in the product gas of hydrocarbon flames

Vestin, Fredrik LU ; Afzelius, Mikael LU ; Brackmann, Christian LU and Bengtsson, Per-Erik LU (2005) In Symposium (International) on Combustion 30(1). p.1673-1680
Abstract
Coherent anti-Stokes Raman spectroscopy (CARS) is an established technique for gas-phase thermometry in combustion. In this work, rotational CARS in the dual-broadband approach has been investigated for flame thermometry in the product gas of ethylene/air flames in a wide range of equivalence ratios (0.5 < phi < 2.5). The nitrogen lines dominated the rotational CARS spectra in the whole equivalence range, but for fuel-lean flames also oxygen lines gave significant spectral contributions. Therefore, the temperature evaluation was based on spectral fitting of both nitrogen and oxygen. Product gas species such as carbon dioxide, water, carbon monoxide, and hydrogen contribute to the non-resonant susceptibility of the gas and influence... (More)
Coherent anti-Stokes Raman spectroscopy (CARS) is an established technique for gas-phase thermometry in combustion. In this work, rotational CARS in the dual-broadband approach has been investigated for flame thermometry in the product gas of ethylene/air flames in a wide range of equivalence ratios (0.5 < phi < 2.5). The nitrogen lines dominated the rotational CARS spectra in the whole equivalence range, but for fuel-lean flames also oxygen lines gave significant spectral contributions. Therefore, the temperature evaluation was based on spectral fitting of both nitrogen and oxygen. Product gas species such as carbon dioxide, water, carbon monoxide, and hydrogen contribute to the non-resonant susceptibility of the gas and influence the nitrogen and oxygen linewidths through collisions. In this work, the main focus was on the influence of these collisions on the nitrogen and oxygen Raman linewidths and consequently the evaluated temperature in the product gas of flames. In the range of studied equivalence ratios with various amounts of different product gas species, the evaluated temperature was raised up to 45 K when including broadening from CO2, H2O, and CO on the measured nitrogen and oxygen lines. It was also concluded that H2O was the main contributor in all non-sooting flames. The influence of the non-resonant susceptibility in the spectral evaluation is discussed, and its coupling to the inclusion of the line broadening from product gas species as well. It has thus been shown that line-broadening effects from product gas species are highly important for quantitative rotational CARS thermometry in flames. (c) 2004 The Combustion Institute. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
rotational CARS thermometry, flame temperature, McKenna burner
in
Symposium (International) on Combustion
volume
30
issue
1
pages
1673 - 1680
publisher
Combustion Institute
external identifiers
  • wos:000229944200182
  • scopus:15544372868
ISSN
0082-0784
DOI
10.1016/j.proci.2004.08.043
language
English
LU publication?
yes
id
94f1302b-14ca-4596-b889-50b4fe349d62 (old id 234207)
date added to LUP
2007-08-10 09:40:43
date last changed
2016-04-16 02:57:26
@article{94f1302b-14ca-4596-b889-50b4fe349d62,
  abstract     = {Coherent anti-Stokes Raman spectroscopy (CARS) is an established technique for gas-phase thermometry in combustion. In this work, rotational CARS in the dual-broadband approach has been investigated for flame thermometry in the product gas of ethylene/air flames in a wide range of equivalence ratios (0.5 &lt; phi &lt; 2.5). The nitrogen lines dominated the rotational CARS spectra in the whole equivalence range, but for fuel-lean flames also oxygen lines gave significant spectral contributions. Therefore, the temperature evaluation was based on spectral fitting of both nitrogen and oxygen. Product gas species such as carbon dioxide, water, carbon monoxide, and hydrogen contribute to the non-resonant susceptibility of the gas and influence the nitrogen and oxygen linewidths through collisions. In this work, the main focus was on the influence of these collisions on the nitrogen and oxygen Raman linewidths and consequently the evaluated temperature in the product gas of flames. In the range of studied equivalence ratios with various amounts of different product gas species, the evaluated temperature was raised up to 45 K when including broadening from CO2, H2O, and CO on the measured nitrogen and oxygen lines. It was also concluded that H2O was the main contributor in all non-sooting flames. The influence of the non-resonant susceptibility in the spectral evaluation is discussed, and its coupling to the inclusion of the line broadening from product gas species as well. It has thus been shown that line-broadening effects from product gas species are highly important for quantitative rotational CARS thermometry in flames. (c) 2004 The Combustion Institute.},
  author       = {Vestin, Fredrik and Afzelius, Mikael and Brackmann, Christian and Bengtsson, Per-Erik},
  issn         = {0082-0784},
  keyword      = {rotational CARS thermometry,flame temperature,McKenna burner},
  language     = {eng},
  number       = {1},
  pages        = {1673--1680},
  publisher    = {Combustion Institute},
  series       = {Symposium (International) on Combustion},
  title        = {Dual-broadband rotational CARS thermometry in the product gas of hydrocarbon flames},
  url          = {http://dx.doi.org/10.1016/j.proci.2004.08.043},
  volume       = {30},
  year         = {2005},
}