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Temporal dynamics of femtosecond-TALIF of atomic hydrogen and oxygen in a nanosecond repetitively pulsed discharge-assisted methane-air flame

Ding, Pengji LU orcid ; Ruchkina, Maria LU ; Del Cont-Bernard, Davide ; Ehn, Andreas LU ; Lacoste, Deanna A. and Bood, Joakim LU (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
; ; ; ; and
organization
publishing date
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}},
}