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Improvement of rotational CARS thermometry in fuel-rich hydrocarbon flames by inclusion of N-2-H-2 Raman line widths

Bohlin, Alexis LU ; Vestin, Fredrik LU ; Joubert, Pierre; Bonamy, Jeanine and Bengtsson, Per-Erik LU (2009) 7th European Conference on Nonlinear Optical Spectroscopy (ECNOS)/1st European Conference on CARS Microscopy In Journal Of Raman Spectroscopy 40(7). p.788-794
Abstract
In rotational coherent anti-Stokes Raman spectroscopy (CARS) thermometry applied to air-fed flames, the temperature sensitivity mainly depends on the intensity distribution of the nitrogen spectral lines. Temperatures are estimated by numerical fitting of theoretical spectra to experimental ones, and one uncertainty in the calculation of theoretical CARS spectra for specific flame conditions is the accuracy in utilized line-broadening coefficients. In a previous article, self-broadened N-2-N-2 line widths were considered in the spectral calculations as well as those of N-2-CO, N-2-CO2, N-2-H2O, and N-2-O-2- In the present article, we also include N-2-H-2 line widths calculated from a newly developed model, and it is shown that the... (More)
In rotational coherent anti-Stokes Raman spectroscopy (CARS) thermometry applied to air-fed flames, the temperature sensitivity mainly depends on the intensity distribution of the nitrogen spectral lines. Temperatures are estimated by numerical fitting of theoretical spectra to experimental ones, and one uncertainty in the calculation of theoretical CARS spectra for specific flame conditions is the accuracy in utilized line-broadening coefficients. In a previous article, self-broadened N-2-N-2 line widths were considered in the spectral calculations as well as those of N-2-CO, N-2-CO2, N-2-H2O, and N-2-O-2- In the present article, we also include N-2-H-2 line widths calculated from a newly developed model, and it is shown that the evaluated temperature from flame spectra increases with increasing mole fractions of hydrogen. For example, in a very rich flame at Phi = 2.5, the use of available line-width data for all major species gives a temperature raise of 72 K at a temperature of similar to 1700 K, in comparison with using self-broadened N-2-N-2 line widths only. Half of this temperature raise is related to the inclusion of N-2-H-2 line widths. This article emphasizes the importance of using adequate line-broadening models for rotational CARS thermometry in flames. Copyright (C) 2009 John Wiley & Sons, Ltd. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
CARS thermometry, rotational coherent anti-Stokes Raman spectroscopy, sooting premixed ethylene/air flames, N-2-H-2 line widths
in
Journal Of Raman Spectroscopy
volume
40
issue
7
pages
788 - 794
publisher
John Wiley & Sons
conference name
7th European Conference on Nonlinear Optical Spectroscopy (ECNOS)/1st European Conference on CARS Microscopy
external identifiers
  • wos:000268738600013
  • scopus:69349094556
ISSN
0377-0486
DOI
10.1002/jrs.2235
language
English
LU publication?
yes
id
a5436e5f-78c0-4cda-a0e4-75489f3ec92b (old id 1478217)
date added to LUP
2009-09-23 09:16:26
date last changed
2017-08-27 04:49:13
@inproceedings{a5436e5f-78c0-4cda-a0e4-75489f3ec92b,
  abstract     = {In rotational coherent anti-Stokes Raman spectroscopy (CARS) thermometry applied to air-fed flames, the temperature sensitivity mainly depends on the intensity distribution of the nitrogen spectral lines. Temperatures are estimated by numerical fitting of theoretical spectra to experimental ones, and one uncertainty in the calculation of theoretical CARS spectra for specific flame conditions is the accuracy in utilized line-broadening coefficients. In a previous article, self-broadened N-2-N-2 line widths were considered in the spectral calculations as well as those of N-2-CO, N-2-CO2, N-2-H2O, and N-2-O-2- In the present article, we also include N-2-H-2 line widths calculated from a newly developed model, and it is shown that the evaluated temperature from flame spectra increases with increasing mole fractions of hydrogen. For example, in a very rich flame at Phi = 2.5, the use of available line-width data for all major species gives a temperature raise of 72 K at a temperature of similar to 1700 K, in comparison with using self-broadened N-2-N-2 line widths only. Half of this temperature raise is related to the inclusion of N-2-H-2 line widths. This article emphasizes the importance of using adequate line-broadening models for rotational CARS thermometry in flames. Copyright (C) 2009 John Wiley & Sons, Ltd.},
  author       = {Bohlin, Alexis and Vestin, Fredrik and Joubert, Pierre and Bonamy, Jeanine and Bengtsson, Per-Erik},
  booktitle    = {Journal Of Raman Spectroscopy},
  issn         = {0377-0486},
  keyword      = {CARS thermometry,rotational coherent anti-Stokes Raman spectroscopy,sooting premixed ethylene/air flames,N-2-H-2 line widths},
  language     = {eng},
  number       = {7},
  pages        = {788--794},
  publisher    = {John Wiley & Sons},
  title        = {Improvement of rotational CARS thermometry in fuel-rich hydrocarbon flames by inclusion of N-2-H-2 Raman line widths},
  url          = {http://dx.doi.org/10.1002/jrs.2235},
  volume       = {40},
  year         = {2009},
}