Investigation of the Near-field Structure of Jet Diffusion Flames by the Laser Sheet Method. 2nd Report. Mechanism of Flame Stabilization by Speaker Excitation.

進, 野田; 廉樹, 上高原; 勝昭, 小野寺; 重信, 神谷; 義昭, 小沼

doi:10.1299/kikaib.64.283

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2009

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“…This means that this control influences all of the downstream flow fields. Noda et al (4) controlled the lifted flame height using loudspeaker oscillation. Chao et al (5) tried to improve the lifted flame stability using eight piezoelectric actuators around the burner exit, driving them with a phase difference to generate vortices.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Laminar Lifted Flame Stability Excited by High-Frequency Acoustic Oscillation

Hirota

Hashimoto

Oso

et al. 2009

JTST

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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.

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Section: Introductionmentioning

confidence: 99%