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Soot sublimation studies in a premixed flat flame using laser-induced incandescence (LII) and elastic light scattering (ELS)

Olofsson, Nils-Erik LU ; Johnsson, Jonathan LU ; Bladh, Henrik LU and Bengtsson, Per-Erik LU orcid (2013) In Applied Physics B 112(3). p.333-342
Abstract
Laser-induced incandescence (LII) as a diagnostic technique is based on rapid heating of soot particles to temperatures of several thousand Kelvin and subsequent detection of the thermal radiation from the laser-heated particles. At such high temperatures, soot sublimation effects must be considered when estimating uncertainties in LII measurements. In this work we have investigated the use of various laser fluences in LII using a Nd:YAG laser at 1,064 nm. Using another Nd:YAG laser at 532 nm, the elastic light scattering (ELS) signal from soot particles heated by the 1,064-nm laser was monitored. This approach makes it possible to determine at which fluence of the LII laser soot sublimation starts to become visible as a decrease in the... (More)
Laser-induced incandescence (LII) as a diagnostic technique is based on rapid heating of soot particles to temperatures of several thousand Kelvin and subsequent detection of the thermal radiation from the laser-heated particles. At such high temperatures, soot sublimation effects must be considered when estimating uncertainties in LII measurements. In this work we have investigated the use of various laser fluences in LII using a Nd:YAG laser at 1,064 nm. Using another Nd:YAG laser at 532 nm, the elastic light scattering (ELS) signal from soot particles heated by the 1,064-nm laser was monitored. This approach makes it possible to determine at which fluence of the LII laser soot sublimation starts to become visible as a decrease in the ELS signal. By performing the measurements at various heights in a premixed sooting flat ethylene/air flame, the fluence threshold above which the ELS signal decreased was found to be higher at the lower flame heights corresponding to younger, smaller and less aggregated particles. The results from this work indicate that the different fluence thresholds for sublimation may be explained by a lower absorption function E(m) for the younger soot particles. (Less)
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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Physics B
volume
112
issue
3
pages
333 - 342
publisher
Springer
external identifiers
  • wos:000325099100005
  • scopus:84892996077
ISSN
0946-2171
DOI
10.1007/s00340-013-5509-z
language
English
LU publication?
yes
id
61c6f987-e637-470f-b9c5-4d3d3ce65fa1 (old id 4172221)
date added to LUP
2016-04-01 10:28:35
date last changed
2022-01-25 23:37:29
@article{61c6f987-e637-470f-b9c5-4d3d3ce65fa1,
  abstract     = {{Laser-induced incandescence (LII) as a diagnostic technique is based on rapid heating of soot particles to temperatures of several thousand Kelvin and subsequent detection of the thermal radiation from the laser-heated particles. At such high temperatures, soot sublimation effects must be considered when estimating uncertainties in LII measurements. In this work we have investigated the use of various laser fluences in LII using a Nd:YAG laser at 1,064 nm. Using another Nd:YAG laser at 532 nm, the elastic light scattering (ELS) signal from soot particles heated by the 1,064-nm laser was monitored. This approach makes it possible to determine at which fluence of the LII laser soot sublimation starts to become visible as a decrease in the ELS signal. By performing the measurements at various heights in a premixed sooting flat ethylene/air flame, the fluence threshold above which the ELS signal decreased was found to be higher at the lower flame heights corresponding to younger, smaller and less aggregated particles. The results from this work indicate that the different fluence thresholds for sublimation may be explained by a lower absorption function E(m) for the younger soot particles.}},
  author       = {{Olofsson, Nils-Erik and Johnsson, Jonathan and Bladh, Henrik and Bengtsson, Per-Erik}},
  issn         = {{0946-2171}},
  language     = {{eng}},
  number       = {{3}},
  pages        = {{333--342}},
  publisher    = {{Springer}},
  series       = {{Applied Physics B}},
  title        = {{Soot sublimation studies in a premixed flat flame using laser-induced incandescence (LII) and elastic light scattering (ELS)}},
  url          = {{http://dx.doi.org/10.1007/s00340-013-5509-z}},
  doi          = {{10.1007/s00340-013-5509-z}},
  volume       = {{112}},
  year         = {{2013}},
}