Ps four-wave mixing measurements of electric field in a ns pulse discharge in a hydrogen diffusion flame

Marien Junior Simeni Simeni, E. Baratte, Y. C. Hung, K. Frederickson, I. V. Adamovich

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Time-resolved electric field in ns pulse discharge plasmas generated in room air and in an atmospheric pressure hydrogen diffusion flame has been measured by ps four-wave mixing, for plane-to-plane electrode geometry. Electric field is put on the absolute scale using the Laplacian field measured before breakdown. The results show that peak electric field during breakdown in the flame, approximately 40?kV/cm, is significantly lower compared to that in room air, 75?kV/cm, due to higher temperature of combustion products. In both cases, peak electric field is higher compared to DC breakdown field. Both in air and in the flame, the electric field follows the applied voltage before breakdown and decreases rapidly after breakdown, due to charge separation and plasma self-shielding. The electric field in air is compared with the predictions of an analytic model of ns pulse breakdown, showing good agreement between the predicted and the measured breakdown field. The model also predicts earlier breakdown as well as breakdown voltage reduction as the temperature is increased, in qualitative agreement with the experimental data. The use of the present ps four-wave mixing diagnostics for measurements of electric fields below ?20?kV/cm in atmospheric pressure flames is challenging, due to low signal-to-noise. The sensitivity of the present diagnostics is controlled by the high temperature and low N 2 fraction in the combustion product mixture, as well as by the limited bandwidth of the Stokes beam generated by the stimulated Raman cell, which provides access only to several rotational levels of nitrogen molecules. The present diagnostics will have much better sensitivity in high-pressure flames, since the four-wave mixing signal scales as the squared number density of nitrogen.

Original languageEnglish (US)
Pages (from-to)1497-1504
Number of pages8
JournalProceedings of the Combustion Institute
Volume37
Issue number2
DOIs
StatePublished - Jan 1 2019
Externally publishedYes

Fingerprint

Four wave mixing
diffusion flames
four-wave mixing
Hydrogen
breakdown
Electric fields
electric fields
hydrogen
pulses
flames
combustion products
air
Air
Electric breakdown
electrical faults
Atmospheric pressure
rooms
atmospheric pressure
Nitrogen
Plasmas

Keywords

  • Diffusion flame
  • Electric field
  • Nanosecond pulse discharge
  • Plasma assisted combustion
  • Ps four-wave mixing

Cite this

Ps four-wave mixing measurements of electric field in a ns pulse discharge in a hydrogen diffusion flame. / Simeni Simeni, Marien Junior; Baratte, E.; Hung, Y. C.; Frederickson, K.; Adamovich, I. V.

In: Proceedings of the Combustion Institute, Vol. 37, No. 2, 01.01.2019, p. 1497-1504.

Research output: Contribution to journalArticle

Simeni Simeni, Marien Junior ; Baratte, E. ; Hung, Y. C. ; Frederickson, K. ; Adamovich, I. V. / Ps four-wave mixing measurements of electric field in a ns pulse discharge in a hydrogen diffusion flame. In: Proceedings of the Combustion Institute. 2019 ; Vol. 37, No. 2. pp. 1497-1504.
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