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Visualization of instantaneous structure and dynamics of large-scale turbulent flames stabilized by a gliding arc discharge

Gao, Jinlong LU ; Kong, Chengdong LU ; Zhu, Jiajian LU ; Ehn, Andreas LU ; Hurtig, Tomas; Tang, Yong; Chen, Shuang LU ; Aldén, Marcus LU and Li, Zhongshan LU (2019) In Proceedings of the Combustion Institute2000-01-01+01:00 37(4). p.5629-5636
Abstract

A burner design with integrated electrodes was used to couple a gliding arc (GA) discharge to a high-power and large-scale turbulent flame for flame stabilization. Simultaneous OH and CH2O planar laser-induced fluorescence (PLIF) and CH PLIF measurements were conducted to visualize instantaneous structures of the GA-assisted flame. Six different regions of the GA-assisted flame were resolved by the multi-species PLIF measurements, including the plasma core, the discharge-induced OH region, the post-flame OH region, the flame front, the preheat CH2O region and the fresh gas mixture. Specifically, the OH profile was observed to be ring-shaped around the gliding arc discharge channel. The formaldehyde... (More)

A burner design with integrated electrodes was used to couple a gliding arc (GA) discharge to a high-power and large-scale turbulent flame for flame stabilization. Simultaneous OH and CH2O planar laser-induced fluorescence (PLIF) and CH PLIF measurements were conducted to visualize instantaneous structures of the GA-assisted flame. Six different regions of the GA-assisted flame were resolved by the multi-species PLIF measurements, including the plasma core, the discharge-induced OH region, the post-flame OH region, the flame front, the preheat CH2O region and the fresh gas mixture. Specifically, the OH profile was observed to be ring-shaped around the gliding arc discharge channel. The formaldehyde (CH2O) was found to be widely distributed in the entire measurement volume even at a low equivalence ratio of 0.4, which suggest that long-lived species from the gliding arc discharge have induced low-temperature oxidations of CH4. The CH layer coincides with the interface of the OH and CH2O regions and indicates that the flame front and the discharge channel are spatially separated by a distance of 3-5 mm. These results reveal that the discharge column acts as a movable pilot flame, providing active radicals and thermal energy to sustain the flame. High-speed video photography was also employed to record the dynamics of the GA-assisted flame. This temporally resolved data was used to study the ignition and propagation behaviors of the flame in response to a temporally modulated burst-mode discharge. The results indicate that turbulent flame can be sustained by matching temporal parameters of the high-voltage bursts to the extinction time of flame.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Flame structure, Gliding arc discharge, Plasma-assisted combustion, PLIF, Turbulent flame
in
Proceedings of the Combustion Institute2000-01-01+01:00
volume
37
issue
4
pages
5629 - 5636
publisher
Elsevier
external identifiers
  • scopus:85048756262
ISSN
1540-7489
DOI
10.1016/j.proci.2018.06.030
language
English
LU publication?
yes
id
753a8021-50b2-411a-ab6e-5430890f938e
date added to LUP
2018-07-04 14:25:45
date last changed
2019-08-14 04:19:32
@article{753a8021-50b2-411a-ab6e-5430890f938e,
  abstract     = {<p>A burner design with integrated electrodes was used to couple a gliding arc (GA) discharge to a high-power and large-scale turbulent flame for flame stabilization. Simultaneous OH and CH<sub>2</sub>O planar laser-induced fluorescence (PLIF) and CH PLIF measurements were conducted to visualize instantaneous structures of the GA-assisted flame. Six different regions of the GA-assisted flame were resolved by the multi-species PLIF measurements, including the plasma core, the discharge-induced OH region, the post-flame OH region, the flame front, the preheat CH<sub>2</sub>O region and the fresh gas mixture. Specifically, the OH profile was observed to be ring-shaped around the gliding arc discharge channel. The formaldehyde (CH<sub>2</sub>O) was found to be widely distributed in the entire measurement volume even at a low equivalence ratio of 0.4, which suggest that long-lived species from the gliding arc discharge have induced low-temperature oxidations of CH<sub>4</sub>. The CH layer coincides with the interface of the OH and CH<sub>2</sub>O regions and indicates that the flame front and the discharge channel are spatially separated by a distance of 3-5 mm. These results reveal that the discharge column acts as a movable pilot flame, providing active radicals and thermal energy to sustain the flame. High-speed video photography was also employed to record the dynamics of the GA-assisted flame. This temporally resolved data was used to study the ignition and propagation behaviors of the flame in response to a temporally modulated burst-mode discharge. The results indicate that turbulent flame can be sustained by matching temporal parameters of the high-voltage bursts to the extinction time of flame.</p>},
  author       = {Gao, Jinlong and Kong, Chengdong and Zhu, Jiajian and Ehn, Andreas and Hurtig, Tomas and Tang, Yong and Chen, Shuang and Aldén, Marcus and Li, Zhongshan},
  issn         = {1540-7489},
  keyword      = {Flame structure,Gliding arc discharge,Plasma-assisted combustion,PLIF,Turbulent flame},
  language     = {eng},
  number       = {4},
  pages        = {5629--5636},
  publisher    = {Elsevier},
  series       = {Proceedings of the Combustion Institute2000-01-01+01:00},
  title        = {Visualization of instantaneous structure and dynamics of large-scale turbulent flames stabilized by a gliding arc discharge},
  url          = {http://dx.doi.org/10.1016/j.proci.2018.06.030},
  volume       = {37},
  year         = {2019},
}