Transition from periodic to non-periodic motion of a Bunsen-type premixed flame tip with burner rotation

Hiroshi Gotoda, Toshihisa Ueda

研究成果: Conference article査読

28 被引用数 (Scopus)

抄録

Unsteady motions of a Bunsen-type premixed flame tip with burner rotation are experimentally investigated from the viewpoint of nonlinear dynamics. The mean velocity from burner tube U is varied from 0.6 to 1.2 m/s, and the rotational speed of the burner tube N is varied from 0 to 2800 rpm. A rich methane/air mixture with the equivalence ratio of ø = 1.43 is used. With the Lewis number Le larger than unity, an axisymmetric oscillating flame is formed between a conical flame and a plateau flame at U = 0.6m/s and swirl number S = 1.14. As U and N increase, but with S constant, the oscillating flame tip motion becomes unstable. This variation in the flame tip motion is shown qualitatively by drawing an attractor and evaluated quantitatively by estimating the correlation dimension. For U ≤ 0.8 m/s, the attractor is a limit cycle and the correlation dimension Dc is estimated at about unity, indicating periodic motion. When U reaches 1.0 m/s, the trajectories of the attractor become rolled up slightly and Dc approaches about 2, indicating quasi-periodic flame tip motion. With a further increase in U, the attractor becomes much more complicated and Dc is estimated as a non-integer value, indicating a deterministic chaos. These results indicate that the flame tip motion with the burner rotation under the condition of Le > 1 varies from periodic to non-periodic (i.e., to chaotic). The present results also show that an analysis based on deterministic chaos theory, such as the correlation dimension, is valid for quantifying the motion of unsteady flames.

本文言語English
ページ(範囲)1503-1509
ページ数7
ジャーナルProceedings of the Combustion Institute
29
2
DOI
出版ステータスPublished - 2002
外部発表はい
イベント30th International Symposium on Combustion - Chicago, IL, United States
継続期間: 2004 7月 252004 7月 30

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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