Experimental and theoretical analysis of cellular instability in lean H2-CH4-air flames at elevated pressures

Ekenechukwu C. Okafor, Yukihide Nagano, Toshiaki Kitagawa

研究成果: ジャーナルへの寄稿記事

21 引用 (Scopus)

抄録

Cellular instability in spherical propagating hydrogen-methane-air flames was studied experimentally in a constant volume chamber at an equivalence ratio of 0.8 and mixture temperature of 350 K. The mole fraction of hydrogen in the binary fuel was varied from 0 to 1.0 for mixture pressures up to 0.50 MPa. Cellular instability started earlier with an increase in the hydrogen mole fraction and mixture pressure. Self-acceleration of some of the propagating cellular flames was recorded and the acceleration increased with hydrogen mole fraction and mixture pressure. The unstretched laminar burning velocity was obtained from experiments and 1-D simulations of the outwardly propagating flames. Asymptotic theories gave a satisfactory qualitative prediction of the trends in the Markstein length, and the critical flame size for the onset of cellular instability. It was concluded that the Markstein length changed to a negative value at elevated pressure due to increased sensitivity of the burning velocity to thermo-diffusive effects.

元の言語英語
ページ(範囲)6581-6592
ページ数12
ジャーナルInternational Journal of Hydrogen Energy
41
発行部数15
DOI
出版物ステータス出版済み - 4 27 2016

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flames
Hydrogen
air
hydrogen
Air
equivalence
Methane
methane
chambers
trends
sensitivity
predictions
simulation
Experiments
Temperature
temperature

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

これを引用

Experimental and theoretical analysis of cellular instability in lean H2-CH4-air flames at elevated pressures. / Okafor, Ekenechukwu C.; Nagano, Yukihide; Kitagawa, Toshiaki.

:: International Journal of Hydrogen Energy, 巻 41, 番号 15, 27.04.2016, p. 6581-6592.

研究成果: ジャーナルへの寄稿記事

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