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

1 Citation (Scopus)

Abstract

A high-frequency (20 kHz) standing wave was applied to the unburned mixture upstream of the 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 effect tended to stabilize the laminar lifted flame.

Original languageEnglish
Pages (from-to)2697-2703
Number of pages7
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume74
Issue number12
DOIs
Publication statusPublished - 2008 Dec

Keywords

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

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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