Flame Propagation in CH4/H2/O2 Blended Mixtures in Smooth Tubes of Millimeter-Scale

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Abstract

There are few studies of flame propagation and the initiation of detonation for blended mixtures. In this article, an experimental study is conducted to investigate the acceleration of a flame in stoichiometric methane/hydrogen/oxygen (CH4/H2/O2) mixtures in millimeter-scale smooth tubes. In the 1.0- and 1.5-mm tubes, there is no flame acceleration or detonation initiation. The flame propagates at a speed of several m/s. This may occur because of the heat loss on a non-adiabatic wall and the condensation of water vapor. When the molar fraction of CH4 in a 3.0-mm tube is larger than 0.3, detonation is initiated. The early stage of flame propagation is divided into propagation at a constant velocity, deceleration, and exponential acceleration. An increase in the molar fraction of CH4 induces a pulsating propagation of a flame.

Original languageEnglish
Pages (from-to)1239-1248
Number of pages10
JournalCombustion science and technology
Volume188
Issue number8
DOIs
Publication statusPublished - 2016 Aug 2

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Physics and Astronomy(all)

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