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Flame front visualization in highly turbulent jet flames using CH3 photofragmentation laser-induced fluorescence

Han, Lei ; Gao, Qiang LU ; Li, Bo LU and Li, Zhongshan LU (2023) In Optics and Laser Technology 159.
Abstract

Flame front visualization using methyl photofragmentation laser-induced fluorescence (CH3-PF-LIF) was demonstrated in turbulent premixed methane/air flames. A pump–probe method was used to detect CH3, where CH3 was first photolyzed to CH (X2П) fragments using a pump laser (212.8 nm), and the fragments were subsequently excited to CH in the C2Σ+ state by a probe laser at 314.4 nm. By detecting fluorescence from CH (C-X), instantaneous two-dimensional flame front imaging with a high signal-to-noise (SNR) ratio was achieved in fuel-lean and turbulent flames. A laser excitation scan was conducted to ensure that the detection of CH3 did not interfere with the other... (More)

Flame front visualization using methyl photofragmentation laser-induced fluorescence (CH3-PF-LIF) was demonstrated in turbulent premixed methane/air flames. A pump–probe method was used to detect CH3, where CH3 was first photolyzed to CH (X2П) fragments using a pump laser (212.8 nm), and the fragments were subsequently excited to CH in the C2Σ+ state by a probe laser at 314.4 nm. By detecting fluorescence from CH (C-X), instantaneous two-dimensional flame front imaging with a high signal-to-noise (SNR) ratio was achieved in fuel-lean and turbulent flames. A laser excitation scan was conducted to ensure that the detection of CH3 did not interfere with the other emissions. Visualization using CH3-PF-LIF was compared with visualization with conventional CH planar laser-induced fluorescence (CH-PLIF). The SNR of CH3-PF-LIF imaging is almost ten times higher than those of CH-PLIF, and flame front visualization using CH3-PF-LIF shows more topological structures than CH-PLIF in fuel-lean and highly turbulent flames.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Flame front visualization, Pump–probe method, Turbulent combustion
in
Optics and Laser Technology
volume
159
article number
109014
publisher
Elsevier
external identifiers
  • scopus:85143766990
ISSN
0030-3992
DOI
10.1016/j.optlastec.2022.109014
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2022 Elsevier Ltd
id
fa345a84-4564-4d60-a297-6941eb22effe
date added to LUP
2022-12-23 11:45:07
date last changed
2023-11-19 13:45:33
@article{fa345a84-4564-4d60-a297-6941eb22effe,
  abstract     = {{<p>Flame front visualization using methyl photofragmentation laser-induced fluorescence (CH<sub>3</sub>-PF-LIF) was demonstrated in turbulent premixed methane/air flames. A pump–probe method was used to detect CH<sub>3</sub>, where CH<sub>3</sub> was first photolyzed to CH (X<sup>2</sup>П) fragments using a pump laser (212.8 nm), and the fragments were subsequently excited to CH in the C<sup>2</sup>Σ<sup>+</sup> state by a probe laser at 314.4 nm. By detecting fluorescence from CH (C-X), instantaneous two-dimensional flame front imaging with a high signal-to-noise (SNR) ratio was achieved in fuel-lean and turbulent flames. A laser excitation scan was conducted to ensure that the detection of CH<sub>3</sub> did not interfere with the other emissions. Visualization using CH<sub>3</sub>-PF-LIF was compared with visualization with conventional CH planar laser-induced fluorescence (CH-PLIF). The SNR of CH<sub>3</sub>-PF-LIF imaging is almost ten times higher than those of CH-PLIF, and flame front visualization using CH<sub>3</sub>-PF-LIF shows more topological structures than CH-PLIF in fuel-lean and highly turbulent flames.</p>}},
  author       = {{Han, Lei and Gao, Qiang and Li, Bo and Li, Zhongshan}},
  issn         = {{0030-3992}},
  keywords     = {{Flame front visualization; Pump–probe method; Turbulent combustion}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Optics and Laser Technology}},
  title        = {{Flame front visualization in highly turbulent jet flames using CH<sub>3</sub> photofragmentation laser-induced fluorescence}},
  url          = {{http://dx.doi.org/10.1016/j.optlastec.2022.109014}},
  doi          = {{10.1016/j.optlastec.2022.109014}},
  volume       = {{159}},
  year         = {{2023}},
}