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Fluorescence-free quantitative measurements of nitric oxide and major species in an ammonia/air flame with Raman spectroscopy

Zubairova, Alsu LU ; Kim, Haisol LU ; Aldén, Marcus LU and Brackmann, Christian LU (2023) In Proceedings of the Combustion Institute 39(1). p.1317-1324
Abstract

Raman spectroscopy is a powerful technique that allows for simultaneous measurements of multiple species; however, it suffers from low signal intensity and, in diagnostics of ammonia (NH3) combustion, strong flame fluorescence. The current work re-introduces a multipass setup to perform enhanced quantitative Raman spectroscopy measurements of major species and nitric oxide (NO) in a premixed laminar lean (π = 0.9) NH3 flame. A way to deal with the strong flame reaction-zone fluorescence is proposed and validated. The measurements were performed using both the second (532 nm, NO detection) and third (355 nm, major species and temperature) harmonics of an Nd:YAG laser. The acquired data sets were compared to the... (More)

Raman spectroscopy is a powerful technique that allows for simultaneous measurements of multiple species; however, it suffers from low signal intensity and, in diagnostics of ammonia (NH3) combustion, strong flame fluorescence. The current work re-introduces a multipass setup to perform enhanced quantitative Raman spectroscopy measurements of major species and nitric oxide (NO) in a premixed laminar lean (π = 0.9) NH3 flame. A way to deal with the strong flame reaction-zone fluorescence is proposed and validated. The measurements were performed using both the second (532 nm, NO detection) and third (355 nm, major species and temperature) harmonics of an Nd:YAG laser. The acquired data sets were compared to the simulation data obtained with two chemical kinetic mechanisms. The reported average post-flame concentration of NO reaches a plateau at 3900 ± 120 ppm, and the detection limit is 700 ppm. The 355 nm excitation wavelength proved to provide close to no flame fluorescence, which allowed for measurements across the entire flame from reactants to products. Thus, major species profiles were acquired, and the concentration and temperature results are in good agreement with the simulation data. Lastly, possible error sources are estimated and ways to minimize them are proposed.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Ammonia, Multipass, Premixed flame, Raman spectroscopy
in
Proceedings of the Combustion Institute
volume
39
issue
1
pages
1317 - 1324
publisher
Elsevier
external identifiers
  • scopus:85138725546
ISSN
1540-7489
DOI
10.1016/j.proci.2022.07.136
language
English
LU publication?
yes
id
44efcf30-2c91-4e5e-9ae7-fbf84bf45ba6
date added to LUP
2022-12-19 15:18:35
date last changed
2023-11-07 00:44:14
@article{44efcf30-2c91-4e5e-9ae7-fbf84bf45ba6,
  abstract     = {{<p>Raman spectroscopy is a powerful technique that allows for simultaneous measurements of multiple species; however, it suffers from low signal intensity and, in diagnostics of ammonia (NH<sub>3</sub>) combustion, strong flame fluorescence. The current work re-introduces a multipass setup to perform enhanced quantitative Raman spectroscopy measurements of major species and nitric oxide (NO) in a premixed laminar lean (π = 0.9) NH<sub>3</sub> flame. A way to deal with the strong flame reaction-zone fluorescence is proposed and validated. The measurements were performed using both the second (532 nm, NO detection) and third (355 nm, major species and temperature) harmonics of an Nd:YAG laser. The acquired data sets were compared to the simulation data obtained with two chemical kinetic mechanisms. The reported average post-flame concentration of NO reaches a plateau at 3900 ± 120 ppm, and the detection limit is 700 ppm. The 355 nm excitation wavelength proved to provide close to no flame fluorescence, which allowed for measurements across the entire flame from reactants to products. Thus, major species profiles were acquired, and the concentration and temperature results are in good agreement with the simulation data. Lastly, possible error sources are estimated and ways to minimize them are proposed.</p>}},
  author       = {{Zubairova, Alsu and Kim, Haisol and Aldén, Marcus and Brackmann, Christian}},
  issn         = {{1540-7489}},
  keywords     = {{Ammonia; Multipass; Premixed flame; Raman spectroscopy}},
  language     = {{eng}},
  number       = {{1}},
  pages        = {{1317--1324}},
  publisher    = {{Elsevier}},
  series       = {{Proceedings of the Combustion Institute}},
  title        = {{Fluorescence-free quantitative measurements of nitric oxide and major species in an ammonia/air flame with Raman spectroscopy}},
  url          = {{http://dx.doi.org/10.1016/j.proci.2022.07.136}},
  doi          = {{10.1016/j.proci.2022.07.136}},
  volume       = {{39}},
  year         = {{2023}},
}