Effect of electric fields on the liftoff of nonpremixed turbulent jet flames

Sang Min Lee*, Cheol Soo Park, Min Suk Cha, Suk Ho Chung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

70 Scopus citations

Abstract

The effect of electric fields on the liftoff of non-premixed turbulent jet flames has been investigated by applying high-voltage alternate current (ac) to the nozzle of propane fuel. Flame liftoff velocities and liftoff heights were measured as functions of applied voltage and frequency. The fuel jet velocity at flame liftoff increased and flame liftoff height decreased with increasing voltage, implying that the range of flame stability can be extended with the ac charging. Meanwhile, the effect was minimal when applying direct current (dc). This stabilization effect with ac charging was also influenced by the frequency. As the applied voltage increased, a streamer corona was generated between the flame edge and the nozzle. When the jet velocity and, thus, the liftoff height becomes large, then the ac charging effect disappeared in such a way that the flame liftoff height became comparable to that of a free jet without applying voltage. The liftoff velocity was correlated linearly with voltage in the corona-free electric field enhanced regime.

Original languageEnglish (US)
Pages (from-to)1703-1709
Number of pages7
JournalIEEE Transactions on Plasma Science
Volume33
Issue number5 II
DOIs
StatePublished - Oct 1 2005

Keywords

  • Alternate current (ac) charging
  • Flame stabilization
  • Liftoff
  • Liftoff height
  • Turbulent jet

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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