Correlation of turbulent burning velocity for syngas/air mixtures at high pressure up to 1.0MPa

Jinhua Wang, Meng Zhang, Yongliang Xie, Zuohua Huang, Taku Kudo, Hideaki Kobayashi

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Instantaneous flame front structures of the turbulent premixed flames of syngas/air and CH4/air mixtures were investigated using OH-PLIF technique at high pressure up to 1.0MPa, through which the turbulent burning velocities were derived and correlated with the turbulence intensity. Results show that both syngas/air and CH4/air mixtures, ST/SL increases remarkably with the increase of u'/SL particularly in the weak turbulence region. For the syngas/air mixture, the intensity of flame front wrinkle is promoted with the increase of hydrogen fraction in the syngas due to the increased preferential diffusive-thermal instability. Compared to CH4/air mixture, the syngas flames possess much wrinkled flame front with much smaller fine cusps structure, and with increasing u'/SL, the rate of the increase of ST/SL for the syngas/air mixtures is more significant than that of CH4/air mixtures. This demonstrates that the increase of flame front area due to turbulence wrinkling is promoted by flame intrinsic instability for syngas/air mixtures. The values of ST/SL for all mixtures increase with the increase of pressure because of the decrease of flame thickness which promotes the hydrodynamic instability. A general correlation of turbulent burning velocity for the syngas/air and CH4/air mixtures was obtained in the form of ST/SL∝a[(P/P0)(u'/SL)]n.

Original languageEnglish
Pages (from-to)90-96
Number of pages7
JournalExperimental Thermal and Fluid Science
Volume50
DOIs
Publication statusPublished - 2013 Oct 1

Keywords

  • High pressure
  • OH-PLIF
  • Syngas
  • Turbulent burning velocity

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Nuclear Energy and Engineering
  • Aerospace Engineering
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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