Ultra-lean combustion through the backflow of burned gas in rotating counterflow twin premixed flames

Makihito Nishioka*, Zhenyu Shen, Akane Uemichi

*この研究の対応する著者

研究成果: Article査読

7 被引用数 (Scopus)

抄録

Rotating counterflow twin premixed flames of methane-air were numerically simulated with detailed chemistry based on a similarity solution to explore the leanest extinction limit without preheating and to elucidate the mechanism of " ultra-lean" combustion. We focused on high rotation rate cases in which unrealistic backflow from infinity is allowed to occur since ultra-lean combustion was found to be realized in such a situation. It was found that the reaction zone is in the backflow zone, where the flame's apparent burning velocity is negative, and that the flame zone width is much smaller than that of a 1-D planar premixed flame due to an inversion of the convexity directions of the profiles of temperature and main species concentrations. The decrease of the flame width seems to make the flame less extinguishable. The equivalence ratio of the leanest flame obtained neglecting radiative heat loss is 0.32, while that obtained with an optically thin radiation model is 0.42, which is still much leaner than the ratio of 0.49 for a 1-D planar premixed flame generated using the same radiation model.

本文言語English
ページ(範囲)2188-2198
ページ数11
ジャーナルCombustion and Flame
158
11
DOI
出版ステータスPublished - 2011 11
外部発表はい

ASJC Scopus subject areas

  • 化学 (全般)
  • 化学工学(全般)
  • 燃料技術
  • エネルギー工学および電力技術
  • 物理学および天文学(全般)

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