C102 回転流中に形成されるブンゼン火炎先端部の振動挙動に対するスワール数の効果(オーガナイズドセッション16 : 新世代エンジンのための燃焼改善と排気低減技術)

概要

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Effects of swirl number on flame tip oscillation of a Bunsen type premixed flame with burner rotation are experimentally investigated. The flame tip oscillation frequency v remains unchanged as the Swirl number S is bellow 0.11, and decreases with increasing S for S>0.11. This suggests that the effect of burner rotation on the flame tip oscillation frequency becomes significant as S exceeds 0.11. When S=0, value of St^<*2>/Ri almost coincides with an empirical correlation (St^<*2>/Ri=0.00028Re^<*2/3>, here, St^*, Rt, and Re^* are, the Strouhal number normalized by the heat release ratio, the Richardson number, and the Reynolds number normalized by the heat release ratio, respectively) proposed by Kostiuk and Cheng. As S is further increased, the gradient of the relationship between St^<*2>/Ri and Re^<*2/3> decreases and finally becomes flat as S exceeds around unity. These results indicate that the Swirl number plays an important role in determining the flame tip oscillation frequency as well as the Reynolds number.
社団法人日本機械学会の論文
2001-11-03