Flame front visualization in highly turbulent jet flames using CH3 photofragmentation laser-induced fluorescence
(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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- author
- Han, Lei ; Gao, Qiang LU ; Li, Bo LU and Li, Zhongshan LU
- organization
- publishing date
- 2023-04
- 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}}, }