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Strategies for Quantitative Planar Laser-Induced Fluorescence of NH Radicals in Flames

Brackmann, C. LU ; Zhou, B. LU ; Li, Z. S. LU and Aldén, M. LU (2016) In Combustion Science and Technology 188(4-5). p.529-541
Abstract

Laser-induced fluorescence imaging of the NH radical using excitation in the (0-0) and (1-0) vibrational bands of the A3Π-X3Σ electronic transition is characterized in premixed NH3-air flames. Filtered detection for excitation of the (1-0) band is found to be beneficial for measurement conditions with a challenging background and/or interferences. Concentration evaluation for excitation in the (0-0) and (1-0) bands is feasible by means of fully or partially saturated fluorescence, respectively. Detection limits of a few tens of ppm for averaged data and 100 ppm on a single-shot basis was achieved for 3-cm imaging size using both excitation alternatives. Thinning and broadening of the NH layer... (More)

Laser-induced fluorescence imaging of the NH radical using excitation in the (0-0) and (1-0) vibrational bands of the A3Π-X3Σ electronic transition is characterized in premixed NH3-air flames. Filtered detection for excitation of the (1-0) band is found to be beneficial for measurement conditions with a challenging background and/or interferences. Concentration evaluation for excitation in the (0-0) and (1-0) bands is feasible by means of fully or partially saturated fluorescence, respectively. Detection limits of a few tens of ppm for averaged data and 100 ppm on a single-shot basis was achieved for 3-cm imaging size using both excitation alternatives. Thinning and broadening of the NH layer in a turbulent flame indicate turbulence/flame chemistry coupling, which occurred at lower turbulence levels compared with hydrocarbon combustion. Fluorescence imaging of the NH flame-front marker in such flames thus provide an experimental configuration for detailed studies of turbulence/flame chemistry interactions.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Ammonia combustion, Laser-induced fluorescence, NH radical
in
Combustion Science and Technology
volume
188
issue
4-5
pages
13 pages
publisher
Taylor & Francis
external identifiers
  • Scopus:84969549203
ISSN
0010-2202
DOI
10.1080/00102202.2016.1138823
language
English
LU publication?
yes
id
cbbf5778-c5c2-422d-a7f7-5905f736b723
date added to LUP
2016-06-28 11:18:11
date last changed
2016-06-28 12:16:10
@misc{cbbf5778-c5c2-422d-a7f7-5905f736b723,
  abstract     = {<p>Laser-induced fluorescence imaging of the NH radical using excitation in the (0-0) and (1-0) vibrational bands of the A<sup>3</sup>Π-X<sup>3</sup>Σ<sup>–</sup> electronic transition is characterized in premixed NH<sub>3</sub>-air flames. Filtered detection for excitation of the (1-0) band is found to be beneficial for measurement conditions with a challenging background and/or interferences. Concentration evaluation for excitation in the (0-0) and (1-0) bands is feasible by means of fully or partially saturated fluorescence, respectively. Detection limits of a few tens of ppm for averaged data and 100 ppm on a single-shot basis was achieved for 3-cm imaging size using both excitation alternatives. Thinning and broadening of the NH layer in a turbulent flame indicate turbulence/flame chemistry coupling, which occurred at lower turbulence levels compared with hydrocarbon combustion. Fluorescence imaging of the NH flame-front marker in such flames thus provide an experimental configuration for detailed studies of turbulence/flame chemistry interactions.</p>},
  author       = {Brackmann, C. and Zhou, B. and Li, Z. S. and Aldén, M.},
  issn         = {0010-2202},
  keyword      = {Ammonia combustion,Laser-induced fluorescence,NH radical},
  language     = {eng},
  month        = {05},
  number       = {4-5},
  pages        = {529--541},
  publisher    = {ARRAY(0xa8efc00)},
  series       = {Combustion Science and Technology},
  title        = {Strategies for Quantitative Planar Laser-Induced Fluorescence of NH Radicals in Flames},
  url          = {http://dx.doi.org/10.1080/00102202.2016.1138823},
  volume       = {188},
  year         = {2016},
}