Effects of hydrocarbon addition on cellular instabilities in expanding syngas-air spherical premixed flames

Tran Manh Vu, Jeong Park, Oh Boong Kwon, Jeong Soo Kim

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Abstract

Experiments were conducted in a constant pressure combustion chamber using high-speed schlieren imaging to investigate the effects of hydrocarbon addition on cellular instabilities of syngas-air flames at room temperature and elevated pressures. The measured laminar burning velocities were compared with the predicted results computed using some reliable kinetic mechanisms with detailed transport and chemistry. The cellular instabilities for the hydrocarbon-added syngas-air flames were interpreted and evaluated in the viewpoint of the hydrodynamic and diffusional-thermal instabilities. Also, experimentally measured Peclet numbers were compared with the predicted results for fuel-lean flames. Experimental results showed that the laminar burning velocities decreased significantly with the increase amount of hydrocarbon addition in the reactant mixtures. With propane and butane additions, the propensity for cells formation was significantly diminished in both hydrodynamic and diffusional-thermal instabilities, whereas the cellular instabilities for methane-added syngas-air flames are not suppressed.

Original languageEnglish
Pages (from-to)6961-6969
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume34
Issue number16
DOIs
Publication statusPublished - Aug 2009
Externally publishedYes

Keywords

  • Cells formation
  • Effective Lewis number
  • Flame instability
  • H/CO syngas
  • Premixed combustion

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