An experimental and theoretical investigation of the dilution, pressure and flow-field effects on the extinction condition of methane-air-nitrogen diffusion flames

H. K. Chelliah, C. K. Law, T. Ueda, M. D. Smooke, F. A. Williams

研究成果: Article査読

170 被引用数 (Scopus)

抄録

Velocity fields, and extinction conditions for methane-air diffusion flames are measured for an opposed-flow nozzle-type burner system and calculated by a numerical-integration, routine for pressures from 0.25 to 2.5 atm and for dilutions having fixed stoichiometric mixture fractions with oxidizer-stream oxygen mass fractions from 0.233 to 0.190. Imposition of boundary conditions ranging from potential flow to plug flow reveals that changes on the order of a factor of two in the oxidizer-side strain rate at extinction can be produced by changes in opposed-flow burner design. It is shown that the maximum velocity gradient, however which occurs on the fuel side of the main reaction zone, achieves a value at extinction that is relatively insensitive to the boundary conditions of the flow. The results explain differences found by different investigators on influences of dilution on extinction strain rates and show that most counterflow burners are closer to the plug-flow limit than to the potential-flow limit. Strain rates at extinction without dilution are shown to increase with increasing pressure over the above-stated range, countrary to previously observed behaviors with dilution or at very high pressures. This behavior is explained as a consequence of decreasing peak radical concentration with increasing pressure.

本文言語English
ページ(範囲)503-511
ページ数9
ジャーナルSymposium (International) on Combustion
23
1
DOI
出版ステータスPublished - 1991
外部発表はい

ASJC Scopus subject areas

  • 化学工学(全般)
  • 燃料技術
  • エネルギー工学および電力技術
  • 機械工学
  • 物理化学および理論化学
  • 流体および伝熱

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