高周波振動による層流浮き上がり火炎の安定性の向上(熱工学,内燃機関,動力など)

概要

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A high-frequency (20kHz) 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.
2008-12-25