Computational and experimental investigation of emissions in a highly humidified premixed flame

Fredrik Hermann, Jens Klingmann, Rolf Gabrielsson

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingpeer-review

17 Citations (SciVal)


Emission formation and flame stability were investigated, both experimentally and computationally, for premixed combustion with varying amounts of water vapor in the mixture. Emission measurements were made in a gas turbine combustor at atmospheric conditions, using Danish Natural Gas (NG) as fuel. The emissions were mapped as a function of humidity, inlet air temperature, equivalence ratio and aerodynamic load. Operating conditions were chosen to match what can be expected from e.g. an EvGT cycle for power generation. The inlet air temperature was slightly lower than the inlet temperatures that would be found in a recuperated cycle. The degree of humidity was varied from 0w% to 33w% of the airflow in the experiment, while the air inlet temperature was varied from 500K to 800K. Computations were made using a single Perfectly Stirred Reactor (PSR) model and a reaction scheme with 821 reactions and 69 species. It was found that the NO<sub>X</sub> emissions were strongly reduced by the addition of water. Most of this decrease vanishes in practical combustion since richer combustion is required to keep CO emissions (combustion efficiency) at a tolerable level. The maximum humidity was found to be dependent on inlet air temperature and aerodynamic load. In this experiment, the maximum humidity achieved was 33%.
Original languageEnglish
Title of host publicationAmerican Society of Mechanical Engineers, International Gas Turbine Institute, Turbo Expo (Publication) IGTI
PublisherAmerican Society Of Mechanical Engineers (ASME)
Publication statusPublished - 2003
Event2003 ASME Turbo Expo - Atlanta, GA, United States
Duration: 2003 Jun 162003 Jun 19

Publication series



Conference2003 ASME Turbo Expo
Country/TerritoryUnited States
CityAtlanta, GA

Subject classification (UKÄ)

  • Energy Engineering


  • Combustion efficiency
  • Premixed flame
  • Perfectly stirred reactor (PSR)


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