The effect of the blockage ratio on the blow-off limit of a hydrogen/air flame in a planar micro-combustor with a bluff body

Aiwu Fan, Jianlong Wan, Yi Liu, Boming Pi, Hong Yao, Kaoru Maruta, Wei Liu

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)

Abstract

We recently developed a micro-combustor with a bluff body, which has a demonstrated 3- to 5-time extension in the blow-off limit. In the present work, the dimension effect of the bluff body on the blow-off limit (indicated by the blockage ratio, ζ) was investigated with a detailed H2/O 2 reaction mechanism. The results indicate that the blow-off limits for ζ = 0.3, 0.4 and 0.5 are 20, 31 and 36 m/s, respectively. Analyses reveal that for ζ = 0.3, flame blowout occurs due to insufficient recirculation zone size. However, flame blowout occurs due to the stretching effect in the shear layers when ζ = 0.4 and 0.5. Calculations indicate that the three cases have negligible differences in heat loss because the high temperature zones are located in the combustor centers; therefore, their effects on the combustor walls are mitigated.

Original languageEnglish
Pages (from-to)11438-11445
Number of pages8
JournalInternational Journal of Hydrogen Energy
Volume38
Issue number26
DOIs
Publication statusPublished - 2013 Aug 30

Keywords

  • Blockage ratio
  • Blow-off limit
  • Heat loss
  • Micro-combustor
  • Recirculation zone
  • Stretching effect

ASJC Scopus subject areas

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

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