Burning velocity and flame structure of CH 4 /NH 3 /air turbulent premixed flames at high pressure

Akinori Ichikawa, Yuji Naito, Akihiro Hayakawa, Taku Kudo, Hideaki Kobayashi

Research output: Contribution to journalArticlepeer-review

58 Citations (Scopus)


Ammonia is one of the most promising alternative fuels. In particular, ammonia combustion for gas turbine combustors for power generation is expected. To shift the fuel for a gas turbine combustor to ammonia step-by-step, the partial replacement of natural gas by ammonia is considered. To reveal the turbulent combustion characteristics, CH 4 /NH 3 /air turbulent premixed flame at 0.5 MPa was experimentally investigated. The ammonia ratio based on the mole fraction and lower heating value was varied from 0 to 0.2. The results showed that the ratio of the turbulent burning velocity and unstretched laminar burning velocity decreased with an increase in the ammonia ratio. The reason for this variation is that the flame area decreased with an increase in the ammonia ratio as the flame surface density decreased and the fractal inner cutoff increased. The volume fractions in the turbulent flame region were almost the same with ammonia addition, indicating that combustion oscillation can be handled in a manner similar to that for the case of natural gas for CH 4 /NH 3 /air flames.

Original languageEnglish
Pages (from-to)6991-6999
Number of pages9
JournalInternational Journal of Hydrogen Energy
Issue number13
Publication statusPublished - 2019 Mar 8


  • Ammonia
  • High pressure
  • Methane
  • Turbulent burning velocity
  • Turbulent combustion


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