Strategies for Quantitative Planar Laser-Induced Fluorescence of NH Radicals in Flames
(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
- Brackmann, C. LU ; Zhou, B. LU ; Li, Z. S. LU and Aldén, M. LU
- organization
- publishing date
- 2016-05-03
- 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
-
- wos:000375480000006
- 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
- 2024-08-09 15:13:49
@article{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}}, keywords = {{Ammonia combustion; Laser-induced fluorescence; NH radical}}, language = {{eng}}, month = {{05}}, number = {{4-5}}, pages = {{529--541}}, publisher = {{Taylor & Francis}}, 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}}, doi = {{10.1080/00102202.2016.1138823}}, volume = {{188}}, year = {{2016}}, }