Counterflow diffusion flame oscillations induced by ns pulse electric discharge waveforms

Yong Tang, Marien Junior Simeni Simeni, Kraig Frederickson, Qiang Yao, Igor V. Adamovich

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Repetitive ns pulse, dielectric barrier discharge voltage waveforms, combined with a tail several ms long, are used to induce oscillations of a counterflow atmospheric pressure diffusion flame. A baseline ns pulse discharge operated at 10 Hz results in a relatively modest oscillatory response of the flame, which becomes more pronounced in burst mode operation, at the same burst repetition rate of 10 Hz. This effect is most likely caused by the residual electric field after the discharge pulse, producing the electrohydrodynamic (EHD)force (“ion wind”)on the charges generated during the discharge, although plasma chemistry and Joule heating by the discharge may also contribute. Manipulating the external circuit to add a variable duration tail to the discharge pulse, without changing the pulse shape during breakdown or the pulse repetition rate, considerably enhances the impulse of the EHD force and increases the amplitude of the flame oscillations. To quantify this effect, the electric field distribution between the electrodes during and after the discharge pulse is measured by ps Electric Field Induced Second Harmonic (E-FISH)diagnostic. The results show that the electric field is maintained during the voltage tail, although it is lower compared to the Laplacian field due to the charge accumulation on the dielectric sleeves covering the electrodes. The time scale of the flame oscillations at the present conditions, of the order of ∼10 ms, is limited by the relatively slow momentum transfer from the ions to the neutral species. The present results demonstrate feasibility of enhancing the flame control authority, by combining a high peak ionization fraction generated by a ns pulse discharge with the EHD force applied on a long time scale, using a single plasma generator.

Original languageEnglish (US)
Pages (from-to)239-248
Number of pages10
JournalCombustion and Flame
Volume206
DOIs
StatePublished - Aug 1 2019

Fingerprint

Electric discharges
counterflow
electric discharges
diffusion flames
Electrohydrodynamics
waveforms
Electric fields
oscillations
pulses
electrohydrodynamics
flames
Ions
Plasmas
Pulse repetition rate
Electrodes
Joule heating
Momentum transfer
electric fields
Electric potential
Atmospheric pressure

Keywords

  • Counterflow flame
  • Electric field
  • Flame oscillations
  • Ion wind
  • Ns pulse discharge
  • Second harmonic generation

Cite this

Counterflow diffusion flame oscillations induced by ns pulse electric discharge waveforms. / Tang, Yong; Simeni Simeni, Marien Junior; Frederickson, Kraig; Yao, Qiang; Adamovich, Igor V.

In: Combustion and Flame, Vol. 206, 01.08.2019, p. 239-248.

Research output: Contribution to journalArticle

Tang, Yong ; Simeni Simeni, Marien Junior ; Frederickson, Kraig ; Yao, Qiang ; Adamovich, Igor V. / Counterflow diffusion flame oscillations induced by ns pulse electric discharge waveforms. In: Combustion and Flame. 2019 ; Vol. 206. pp. 239-248.
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