Effects of Adiabatic Flame Temperature and Oxygen Concentration in CH4/N2/O2Nonswirl Jet Flames: Experimental and Numerical Study

Mansur Aliyu*, Medhat A. Nemitallah, Ahmed Abdelhafez, Syed A.M. Said, Paul C. Okonkwo, Mohamed A. Habib

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The combustion characteristics of oxygen-enriched air-methane (i.e., O2/N2/CH4) flames in a premixed mode are investigated using both experimentally and numerically under atmospheric conditions for emissions reduction purposes. The investigation is carried out using a gas turbine model combustor equipped with a multihole burner that mimics gas turbine micromixer burners. The resulting flame is of jet type, and the velocity of the jet is kept at 5.2 m/s for all the considered flames. Models used in the numerical study include large eddy simulation, discrete ordinate, and partially premixed combustion for turbulence, radiation, and species models, respectively. The numerical results are validated, and a suitable agreement is achieved with experimental data. The results indicated that the temperature distribution, shape, and size of O2/N2/CH4 flames are predominantly controlled by adiabatic flame temperature (Tad). However, the oxygen fraction, rather than Tad, is responsible for the reaction progress. The emission of NO, CO, and CO2 increases with an increase in oxygen fraction, and the product formation in O2/N2/CH4 flames is less compared to their oxy-fuel (i.e., O2/CO2/CH4) counterparts, because N2 is mostly inert, compared to CO2. The latter participates significantly in flame reactions, which increases the rate of product formation in O2/CO2/CH4 flames.

Original languageEnglish
Article number081201
JournalJournal of Energy Resources Technology, Transactions of the ASME
Issue number8
StatePublished - 1 Aug 2023

Bibliographical note

Funding Information:
Acknowledgment The authors appreciate the support received from King Fahd University of Petroleum and Minerals to perform this work through project number DF191005. The support provided by the King Abdullah City for Atomic and Renewable Energy (K.A. CARE) is also acknowledged.

Publisher Copyright:
Copyright © 2023 by ASME.


  • flame stability
  • gas turbine
  • oxy-fuel combustion
  • oxygenenriched air combustion
  • premixed combustion

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Mechanical Engineering
  • Geochemistry and Petrology


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