Numerical analysis of extremely-rich CH4/O2/H2O premixed flames at high pressure and high temperature considering production of higher hydrocarbons

Manabu Kumagami, Yasuhiro Ogami, Yuichi Tamaki, Hideaki Kobayashi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Numerical analysis of CH4/O2/H2O laminar premixed flame under various conditions of pressure, equivalence ratio and steam concentration was performed using GRI-Mech 3.0 and the mechanism proposed by Davis and Law, which consists of C1 to C6 hydrocarbons in addition to GRI-Mech 3.0. The pressure dependence of laminar burning velocity and flame structure under fuel-rich conditions was focused on. Effects of the formation of higher hydrocarbons under fuel-rich conditions were also clarified using the mechanism proposed by Davis and Law. Results showed that for extremely fuel-rich conditions, laminar burning velocity increases as pressure increases for both mechanisms. The increase of laminar burning velocity is caused by the shift of the oxidation pathway of CH3 radical from the C2 Route to the C1 Route. The formation of C3-C6 hydrocarbons has only a small effect on laminar burning velocity. Under fuel-rich conditions, super-adiabatic flame temperature (SAFT) occurs and its pressure dependency was clarified.

Original languageEnglish
Pages (from-to)109-123
Number of pages15
JournalJournal of Thermal Science and Technology
Volume5
Issue number1
DOIs
Publication statusPublished - 2010

Keywords

  • Fuel-rich premixed flames
  • Higher hydrocarbons
  • Pressure effect
  • Steam dilution effect
  • Super-adiabatic flame temperature

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Instrumentation
  • Engineering (miscellaneous)

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