Tomography Diagnostics of Turbulent Premixed Flame with Fine and Intense Turbulence

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  • A132 微細スケールの強い乱れを伴う予混合火炎のトモグラフィー観察
  • ビサイ スケール ノ ツヨイ ミダレ オ トモナウ ヨコンゴウ カエン ノ ト

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Abstract

It is well-known that turbulent wake flow behind the grating which consists of fine cylindrical rods has many eddies with a uniform scale particular to the rod diameter, and exhibits a dominant peak in the frequency spectrum of the velocity fluctuation. In this investigation the behavior of the turbulent premixed flame propagating in such a intense turbulent wake flow without mean, which is produced by a high speed motion of the grating of about lOm/s in stagnant premixed gas, are optically examined using tomography technique. It is first shown that, in the case without motion of the grating, a smooth and spherically-propagating laminar flame is observed in the stagnant mixture. In the intense turbulent wake flow without combustion, many eddies with a uniform scale are clearly distinguished, and a corrugated flame front propagating radially is clearly observed in the case with combustion. Keywords: Combustion, Turbulent Premixed Flame, Flame Structure, Tomography Diagnostics, Fine and Intense Turbulence

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