Temporal dynamics of femtosecond-TALIF of atomic hydrogen and oxygen in a nanosecond repetitively pulsed discharge-assisted methane-air flame
(2021) In Journal of Physics D: Applied Physics 54(27).- Abstract
The temporal dynamics of the spatial distribution of atomic hydrogen and oxygen in a lean methane-air flame, forced by a nanosecond repetitively pulsed discharge-induced plasma, are investigated via femtosecond two-photon absorption laser-induced fluorescence technique. Plasma luminescence that interferes with the fluorescence from H and O atoms was observed to decay completely within 15 ns, which is the minimum delay required for imaging measurements with respect to the discharge occurrence. During discharge, H atoms in the excited state rather than the ground state, produced by electron-impact dissociation processes, are detected at the flame front. It was found that the temporal evolution of H and O fluorescence intensity during a... (More)
The temporal dynamics of the spatial distribution of atomic hydrogen and oxygen in a lean methane-air flame, forced by a nanosecond repetitively pulsed discharge-induced plasma, are investigated via femtosecond two-photon absorption laser-induced fluorescence technique. Plasma luminescence that interferes with the fluorescence from H and O atoms was observed to decay completely within 15 ns, which is the minimum delay required for imaging measurements with respect to the discharge occurrence. During discharge, H atoms in the excited state rather than the ground state, produced by electron-impact dissociation processes, are detected at the flame front. It was found that the temporal evolution of H and O fluorescence intensity during a cycle of 100 µs between two discharge pulses remains constant. Finally, the decay time of O-atoms produced by the discharge in the fresh methane-air mixture was about 2 µs, which suggests a faster reaction between O-atoms and methane than in air.
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- author
- Ding, Pengji LU ; Ruchkina, Maria LU ; Del Cont-Bernard, Davide ; Ehn, Andreas LU ; Lacoste, Deanna A. and Bood, Joakim LU
- organization
- publishing date
- 2021-07
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- atomic hydrogen, atomic oxygen, fs-TALIF, NRP, plasma assisted combustion
- in
- Journal of Physics D: Applied Physics
- volume
- 54
- issue
- 27
- article number
- 275201
- publisher
- IOP Publishing
- external identifiers
-
- scopus:85105398036
- ISSN
- 0022-3727
- DOI
- 10.1088/1361-6463/abf61f
- project
- Advanced Laser Diagnostics for Discharge Plasma
- language
- English
- LU publication?
- yes
- id
- 62c69042-ef9c-4b45-98f9-43fe2994841c
- date added to LUP
- 2022-02-04 16:02:36
- date last changed
- 2022-10-25 00:21:35
@article{62c69042-ef9c-4b45-98f9-43fe2994841c, abstract = {{<p>The temporal dynamics of the spatial distribution of atomic hydrogen and oxygen in a lean methane-air flame, forced by a nanosecond repetitively pulsed discharge-induced plasma, are investigated via femtosecond two-photon absorption laser-induced fluorescence technique. Plasma luminescence that interferes with the fluorescence from H and O atoms was observed to decay completely within 15 ns, which is the minimum delay required for imaging measurements with respect to the discharge occurrence. During discharge, H atoms in the excited state rather than the ground state, produced by electron-impact dissociation processes, are detected at the flame front. It was found that the temporal evolution of H and O fluorescence intensity during a cycle of 100 µs between two discharge pulses remains constant. Finally, the decay time of O-atoms produced by the discharge in the fresh methane-air mixture was about 2 µs, which suggests a faster reaction between O-atoms and methane than in air.</p>}}, author = {{Ding, Pengji and Ruchkina, Maria and Del Cont-Bernard, Davide and Ehn, Andreas and Lacoste, Deanna A. and Bood, Joakim}}, issn = {{0022-3727}}, keywords = {{atomic hydrogen; atomic oxygen; fs-TALIF; NRP; plasma assisted combustion}}, language = {{eng}}, number = {{27}}, publisher = {{IOP Publishing}}, series = {{Journal of Physics D: Applied Physics}}, title = {{Temporal dynamics of femtosecond-TALIF of atomic hydrogen and oxygen in a nanosecond repetitively pulsed discharge-assisted methane-air flame}}, url = {{https://lup.lub.lu.se/search/files/119440484/Ding_2021_J._Phys._D_Appl._Phys._54_275201.pdf}}, doi = {{10.1088/1361-6463/abf61f}}, volume = {{54}}, year = {{2021}}, }