Flame structure and thermal NOx formation in hydrogen diffusion flames with reduced kinetic mechanisms

Su Ryong Lee*, Sim Soo Park, Suk Ho Chung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Structure and thermal NOx formation of hydrogen diffusion flames are studied numerically, by adopting a counterflow as a model problem. Detailed kinetic mechanism having twenty-one step hydrogen oxidation is systematically reduced to a two-step mechanism while five-step thermal NOx chemistry of the extended Zel'dovich mechanism is reduced to one-step. Results show that the extinction strain rates are much higher than those for hydrocarbon flames and the NOx production can be controlled by increasing strain rates which results in the decrease of flame temperature significantly. Comparison between the results of the detailed and reduced mechanisms demonstrates that the reduced mechanism successully describes the essential features of hydrogen diffusion flames including the flame structure, extinction strain rate and NOx production.

Original languageEnglish (US)
Pages (from-to)377-384
Number of pages8
JournalKSME Journal
Issue number3
StatePublished - Jan 1 1995


  • Diffusion Flame
  • Extinction
  • Hydrogen
  • Reduced Mechanism
  • Thermal NO

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering


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