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

Mitsutomo Hirota, Kota Hashimoto, Hiroki Oso, Goro Masuya

研究成果: Article査読

1 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)2697-2703
ページ数7
ジャーナルNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
74
12
DOI
出版ステータスPublished - 2008 12
外部発表はい

ASJC Scopus subject areas

  • 凝縮系物理学
  • 機械工学

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