Flame front structure and burning velocity of turbulent premixed CH 4/H2/air flames

Meng Zhang, Jinhua Wang, Yongliang Xie, Wu Jin, Zhilong Wei, Zuohua Huang, Hideaki Kobayashi

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)

Abstract

Flame front structure of turbulent premixed CH4/H 2/air flames at various hydrogen fractions was investigated with OH-PLIF technique. A nozzle-type burner was used to achieve the stabilized turbulent premixed flames. Hot-wire anemometer measurement and OH-PLIF observation were performed to measure the turbulent flow and detect the instantaneous flame front structure, respectively. The hydrogen fractions of 0%, 5%, 10% and 20% were studied. Results show that the flame front structures of the turbulent premixed flames are wrinkled flame front with small scale convex and concave structures compared to that of the laminar-flame front. The wrinkle intensity of flame front is promoted with the increase of turbulence intensity as well as hydrogen fraction. Hydrogen addition promotes the flame intrinsic instability which leads to the active response of laminar flame to turbulence and results in the much more wrinkled flame front structure. The value of S T/SL increases monotonically with the increase of u′/SL and hydrogen fraction. The increase of S T/SL with the increase of hydrogen fraction is mainly attributed to the diffusive-thermal instability effects represented by the effective Lewis number, Leeff. A general correlation between S T/SL and u′/SL is provided from the experimental data fitting in the form of ST/SL ∞ a(u′/SL)n, and the exponent, n, gives the constant value of 0.35 for all conditions and at various hydrogen fractions.

Original languageEnglish
Pages (from-to)11421-11428
Number of pages8
JournalInternational Journal of Hydrogen Energy
Volume38
Issue number26
DOIs
Publication statusPublished - 2013 Aug 30

Keywords

  • Flame front structure
  • Hydrogen addition
  • OH-PLIF
  • Turbulent burning velocity

ASJC Scopus subject areas

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

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