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The Effects of addition of carbon dioxide and water vapor on the dynamic behavior of spherically expanding hydrogen/air premixed flames

水素-空気球状伝播火炎の動的挙動に及ぼす二酸化炭素と水蒸気の添加の影響

勝身 俊之; 吉田 康人*; 中川 燎*; 矢澤 慎也*; 熊田 正志*; 佐藤 大輔*; Thwe Thwe, A.  ; Chaumeix, N.*; 門脇 敏

Katsumi, Toshiyuki; Yoshida, Yasuhito*; Nakagawa, Ryo*; Yazawa, Shinya*; Kumada, Masashi*; Sato, Daisuke*; Thwe Thwe, A.; Chaumeix, N.*; Kadowaki, Satoshi

水素/空気予混合火炎の動的挙動の特性に及ぼす二酸化炭素と水蒸気の添加の影響を実験的に解明した。シュリーレン画像により、火炎面の凹凸が低い当量比で明瞭に観察された。火炎半径が大きくなると共に伝播速度は単調に増加し、火炎面の凹凸の形成に起因する火炎加速が生じた。不活性ガスの添加量を増やすと、特にCO$$_{2}$$添加の場合、伝播速度が低下した。さらに、マークスタインの長さと凹凸係数が減少した。これは、CO$$_{2}$$またはH$$_{2}$$Oの添加が水素火炎の不安定な動きを促進したことを示してあり、拡散熱効果の強化が原因であると考えられる。水素火炎の動的挙動の特性に基づいて、火炎加速を含む伝播速度の数学モデルで使用されるパラメータが得られ、その後、さまざまな条件下での火炎伝播速度が予測された。

The effects of addition of CO$$_{2}$$ and water vapor on characteristics of dynamic behavior of hydrogen/air premixed flames were elucidated experimentally. By Schlieren photography, wrinkles on the flame surface were clearly observed in low equivalence ratios. The propagation velocity increased monotonically as the flame radius became larger and flame acceleration was found. Increasing the addition of inert gas, the propagation velocity decreased, especially in the case of CO$$_{2}$$ addition. Moreover, the Markstein length and the wrinkling factor decreased. This indicated that the addition of Co$$_{2}$$ or H$$_{2}$$O promoted the unstable motion of hydrogen flames, which could be due to the enhancement of the diffusive-thermal effect. Based on the characteristics of dynamic behavior of hydrogen flames, the parameters used in the mathematical model on propagation velocity including flame acceleration was obtained, and then the flame propagation velocity under various conditions was predicted.

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パーセンタイル:38.02

分野:Thermodynamics

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