Improvement of laminar lifted flame stability excited by high-frequency acoustic oscillation

Mitsutomo Hirota, Kota Hashimoto, Hiroki Oso, Goro Masuya

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A high-frequency (20kHz) standing wave was applied to the unburned mixture upstream of a methane-air lifted jet flame using a bolt-clamped Langevin transducer (BLT) to improve stability. The flow field near the flame was visualized using acetone planar-laser-induced fluorescence (PLIF). The standing wave decreased the lifted flame height and increased the blow-off limit. The upstream flow field of the center jet then bent. This phenomenon appeared when there was a density difference between the center jet and the surrounding secondary flow. When the density of the center jet was less than that of the co-flow, the center jet was redirected to the pressure anti-node side. Conversely, when the density of the center jet was greater than that of the co-flow, the center jet was redirected to the pressure node side. This redirection tended to stabilize the laminar lifted flame.

Original languageEnglish
Pages (from-to)169-177
Number of pages9
JournalJournal of Thermal Science and Technology
Volume4
Issue number1
DOIs
Publication statusPublished - 2009 Dec 1

Keywords

  • Lifted flame
  • Premixed combustion
  • Sound and acoustic
  • Stability
  • Supersonic wave

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Instrumentation
  • Engineering (miscellaneous)

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