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Quantitative C2H2 measurements in sooty flames using mid-infrared polarization spectroscopy

Sun, Zhiwei LU ; Li, Zhongshan LU ; Li, Bo LU ; Alwahabi, Z. T. and Alden, M. (2010) In Applied Physics B 101(1-2). p.423-432
Abstract
Quantitative measurements of acetylene (C2H2) molecules as a combustion intermediate species in a series of rich premixed C2H4/air flames were non-intrusively performed, spatially resolved, using mid-infrared polarization spectroscopy (IRPS), by probing its fundamental ro-vibrational transitions. The flat sooty C2H4/air premixed flames with different equivalence ratios varying from 1.25 to 2.50 were produced on a 6 cm diameter porous-plug McKenna type burner at atmospheric pressure, and all measurements were performed at a height of 8.5 mm above the burner surface. IRPS excitation scans in different flame conditions were performed and rotational line-resolved spectra were recorded. Spectral features of acetylene molecules were readily... (More)
Quantitative measurements of acetylene (C2H2) molecules as a combustion intermediate species in a series of rich premixed C2H4/air flames were non-intrusively performed, spatially resolved, using mid-infrared polarization spectroscopy (IRPS), by probing its fundamental ro-vibrational transitions. The flat sooty C2H4/air premixed flames with different equivalence ratios varying from 1.25 to 2.50 were produced on a 6 cm diameter porous-plug McKenna type burner at atmospheric pressure, and all measurements were performed at a height of 8.5 mm above the burner surface. IRPS excitation scans in different flame conditions were performed and rotational line-resolved spectra were recorded. Spectral features of acetylene molecules were readily recognized in the spectral ranges selected, with special attention to avoid the spectral interference from the large amount of coexisting hot water and other hydrocarbon molecules. On-line calibration of the optical system was performed in a laminar C2H2/N-2 gas flow at ambient conditions. Using the flame temperatures measured by coherent anti-Stokes Raman spectroscopy in a previous work, C2H2 mole fractions in different flames were evaluated with collision effects and spectral overlap between molecular line and laser source being analyzed and taken into account. C2H2 IRPS signals in two different buffering gases, N-2 and CO2, had been investigated in a tube furnace in order to estimate the spectral overlap coefficients and collision effects at different temperatures. The soot-volume fractions (SVF) in the studied flames were measured using a He-Ne laser-extinction method, and no obvious degrading of the IRPS technique due to the sooty environment has been observed in the flame with SVF up to similar to 2x10(-7). With the increase of flame equivalence ratios not only the SVF but also the C2H2 mole fractions increased. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Physics B
volume
101
issue
1-2
pages
423 - 432
publisher
Springer
external identifiers
  • wos:000282694300053
  • scopus:79959761436
ISSN
0946-2171
DOI
10.1007/s00340-010-4057-z
language
English
LU publication?
yes
id
ceea2e70-fa91-4ed1-a34a-2635c9a6f17a (old id 1726252)
date added to LUP
2010-12-01 11:37:27
date last changed
2018-05-29 10:24:43
@article{ceea2e70-fa91-4ed1-a34a-2635c9a6f17a,
  abstract     = {Quantitative measurements of acetylene (C2H2) molecules as a combustion intermediate species in a series of rich premixed C2H4/air flames were non-intrusively performed, spatially resolved, using mid-infrared polarization spectroscopy (IRPS), by probing its fundamental ro-vibrational transitions. The flat sooty C2H4/air premixed flames with different equivalence ratios varying from 1.25 to 2.50 were produced on a 6 cm diameter porous-plug McKenna type burner at atmospheric pressure, and all measurements were performed at a height of 8.5 mm above the burner surface. IRPS excitation scans in different flame conditions were performed and rotational line-resolved spectra were recorded. Spectral features of acetylene molecules were readily recognized in the spectral ranges selected, with special attention to avoid the spectral interference from the large amount of coexisting hot water and other hydrocarbon molecules. On-line calibration of the optical system was performed in a laminar C2H2/N-2 gas flow at ambient conditions. Using the flame temperatures measured by coherent anti-Stokes Raman spectroscopy in a previous work, C2H2 mole fractions in different flames were evaluated with collision effects and spectral overlap between molecular line and laser source being analyzed and taken into account. C2H2 IRPS signals in two different buffering gases, N-2 and CO2, had been investigated in a tube furnace in order to estimate the spectral overlap coefficients and collision effects at different temperatures. The soot-volume fractions (SVF) in the studied flames were measured using a He-Ne laser-extinction method, and no obvious degrading of the IRPS technique due to the sooty environment has been observed in the flame with SVF up to similar to 2x10(-7). With the increase of flame equivalence ratios not only the SVF but also the C2H2 mole fractions increased.},
  author       = {Sun, Zhiwei and Li, Zhongshan and Li, Bo and Alwahabi, Z. T. and Alden, M.},
  issn         = {0946-2171},
  language     = {eng},
  number       = {1-2},
  pages        = {423--432},
  publisher    = {Springer},
  series       = {Applied Physics B},
  title        = {Quantitative C2H2 measurements in sooty flames using mid-infrared polarization spectroscopy},
  url          = {http://dx.doi.org/10.1007/s00340-010-4057-z},
  volume       = {101},
  year         = {2010},
}