Radiation-induced instability of stretched premixed flames

Yiguang Ju, Chung K. Law, Kaoru Maruta, Takashi Niioka

研究成果: ジャーナルへの寄稿会議記事査読

19 被引用数 (Scopus)

抄録

Unsteady propagation and instability of radiative stretched premixed flames at Lewis numbers close to unity were numerically investigated using helium-diluted counterflow methane flames, with the interest on understanding the stability of three near-limit and sublimit multiple flame regimes, namely, the near stagnation flame, the weak flame, and the distant flame. It is shown that both the near-limit and sublimit near-stagnation flames are stable close to the flammability limit and that a new mode of oscillation instability exists at equivalence ratios sufficiently larger than the flammability limit. In addition, stability of the weak and the distant flames is demonstrated, while unsteady mutual transitions between the near-stagnation flame and the distant flame and jump from the weak flame to the normal flame are found. A comparison of the present prediction with the microgravity experimental observation shows qualitative agreement on the oscillation frequency and region for the occurrence of oscillation. Calculations for Lewis numbers larger and smaller than unity show that the radiation-induced instability is a physically intrinsic phenomenon for radiative stretched premixed flame. The present study provides a satisfactory explanation for the microgravity observation.

本文言語英語
ページ(範囲)1891-1900
ページ数10
ジャーナルProceedings of the Combustion Institute
28
2
DOI
出版ステータス出版済み - 2000
イベント30th International Symposium on Combustion - Chicago, IL, 米国
継続期間: 2004 7月 252004 7月 30

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