Pump-probe strategy for instantaneous 2D detection of CH3in flames using a single laser
(2022) In Applied Optics 61(25). p.7361-7365- Abstract
Visualization of the reaction zone of flames using CH radicals as markers is restricted by the low concentration of CH in fuel-lean conditions. To address this, methyl radicals (CH3) are employed as a substitution of CH in premixed methane/air flames. A pump-probe method was adopted with the pump laser photolyzing CH3 and the probe laser detecting the photolyzed CH(X25) fragments. Laser excitation scanswere performed to ensure that the fluorescence detected was from CH only. Visualization of the reaction zone of flames was accomplished by a CH3 photofragmentation laser-induced fluorescence technique in fuel-lean conditions (the equivalence ratio of 0.4), where CH planar laser-induced fluorescence did not work in both laminar and... (More)
Visualization of the reaction zone of flames using CH radicals as markers is restricted by the low concentration of CH in fuel-lean conditions. To address this, methyl radicals (CH3) are employed as a substitution of CH in premixed methane/air flames. A pump-probe method was adopted with the pump laser photolyzing CH3 and the probe laser detecting the photolyzed CH(X25) fragments. Laser excitation scanswere performed to ensure that the fluorescence detected was from CH only. Visualization of the reaction zone of flames was accomplished by a CH3 photofragmentation laser-induced fluorescence technique in fuel-lean conditions (the equivalence ratio of 0.4), where CH planar laser-induced fluorescence did not work in both laminar and turbulent jet flames. The proposed pump-probe method of CH3 can be used to visualize the reaction zone of hydrocarbon combustion under both fuel-lean and fuel-rich conditions with a superior signal-to-noise ratio.
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- author
- Han, Lei ; Gao, Qiang LU ; Li, Bo LU and Li, Zhongshan LU
- organization
- publishing date
- 2022-09-01
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Applied Optics
- volume
- 61
- issue
- 25
- pages
- 5 pages
- publisher
- Optical Society of America
- external identifiers
-
- pmid:36256035
- scopus:85137130567
- ISSN
- 1559-128X
- DOI
- 10.1364/AO.463442
- language
- English
- LU publication?
- yes
- additional info
- Funding Information: Funding. National Natural Science Foundation of China (52176169, 91741205). Publisher Copyright: ©2022 Optica Publishing Group.
- id
- 840a29e0-8cd5-4f39-bfb0-b91def8d09d6
- date added to LUP
- 2022-09-22 14:04:53
- date last changed
- 2024-05-30 18:39:13
@article{840a29e0-8cd5-4f39-bfb0-b91def8d09d6,
abstract = {{<p>Visualization of the reaction zone of flames using CH radicals as markers is restricted by the low concentration of CH in fuel-lean conditions. To address this, methyl radicals (CH3) are employed as a substitution of CH in premixed methane/air flames. A pump-probe method was adopted with the pump laser photolyzing CH3 and the probe laser detecting the photolyzed CH(X25) fragments. Laser excitation scanswere performed to ensure that the fluorescence detected was from CH only. Visualization of the reaction zone of flames was accomplished by a CH3 photofragmentation laser-induced fluorescence technique in fuel-lean conditions (the equivalence ratio of 0.4), where CH planar laser-induced fluorescence did not work in both laminar and turbulent jet flames. The proposed pump-probe method of CH3 can be used to visualize the reaction zone of hydrocarbon combustion under both fuel-lean and fuel-rich conditions with a superior signal-to-noise ratio. </p>}},
author = {{Han, Lei and Gao, Qiang and Li, Bo and Li, Zhongshan}},
issn = {{1559-128X}},
language = {{eng}},
month = {{09}},
number = {{25}},
pages = {{7361--7365}},
publisher = {{Optical Society of America}},
series = {{Applied Optics}},
title = {{Pump-probe strategy for instantaneous 2D detection of CH<sub>3</sub>in flames using a single laser}},
url = {{http://dx.doi.org/10.1364/AO.463442}},
doi = {{10.1364/AO.463442}},
volume = {{61}},
year = {{2022}},
}