Numerical study on ultra-lean rotating counterflow twin premixed flame of hydrogen-air

Akane Uemichi*, Makihito Nishioka

*この研究の対応する著者

研究成果: Conference article査読

3 被引用数 (Scopus)

抄録

Rotating counterflow twin premixed flame (RCTF) of hydrogen air was numerically simulated with detailed chemistry to explore the possibility of ultra-lean combustion. As a result, it was found that ultra-lean RCTF of equivalence ratio U = 0.052, which is far leaner than the generally-recognized flammability limit U = 0.10, is realized. It was also found that under ultra-lean conditions the flame temperature of RCTF largely exceeds the adiabatic flame temperature; e.g., at O = 0.06 the former is 1171 K, while the latter is 503 K. This increase of burned gas temperature is attributed to the so-called low Lewis number effect within the flammability limit, but under an ultra-lean condition some other mechanism to increase temperature is dominant. The 'pseudo local equivalence ratio' of burned gas of RCTF differs largely from that of the unburned gas due to the extraordinarily high concentration of H 2O. This suggests the possibility that the local condition at the reaction zone is much richer than the unburned gas, which brings about the large temperature increase.

本文言語English
ページ(範囲)1135-1142
ページ数8
ジャーナルProceedings of the Combustion Institute
34
1
DOI
出版ステータスPublished - 2013
外部発表はい

ASJC Scopus subject areas

  • 化学工学(全般)
  • 機械工学
  • 物理化学および理論化学

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