Effect of CO2 dilution on structures of premixed syngas/air flames in a gas turbine model combustor

Francesco Pignatelli, Saeed Derafshzan, David Sanned, Nikolaos Papafilippou, Robert-Zoltán Szász, Muhammad Aqib Chishty, P. Petersson, Xue-Song Bai, Rikard Gebart, Andreas Ehn, Mattias Richter, Daniel Lörstad, Arman Ahamed Subash

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskriftPeer review


The impact of CO dilution on combustion of syngas (a mixture of H2, CO, and CH4) was investigated in a lab-scale gas turbine model combustor at atmospheric pressure conditions. Two mild dilution levels of CO2, corresponding to 15% and 34% of COmole fraction in the syngas/COmixtures, were experimentally investigated to evaluate the effects of COdilution on the flame structures and the emissions of CO and NOx. All experiments were performed at a constant Reynolds number (Re = 10000). High-speed flame luminescence, simultaneous planar laser-induced fluorescence (PLIF) measurements of the OH radicals and particle image velocimetry (PIV) were employed for qualitative and quantitative assessment of the resulting flame and flow structures. The main findings are: (a) the operability range of the syngas flames is significantly affected by the COdilution, with both the lean blowoff (LBO) limit and the flashback limit shifting towards fuel-richer conditions as the COdilution increases; (b) syngas flames exhibit flame-pocket structures with chemical reactions taking place in isolated pockets surrounded by non-reacting fuel/air mixture; (c) the inner recirculation zone tends to move closer to the burner axis at high COdilution, and (d) the NOx emission becomes significantly lower with increasing COdilution while the CO emission exhibits the opposite trend. The flame-pocket structure is more significant with increased COdilution level. The low NOx emissions and high CO emissions are the results of the flame-pocket structures.
TidskriftCombustion and Flame
StatusPublished - 2023 sep. 1

Ämnesklassifikation (UKÄ)

  • Energiteknik
  • Atom- och molekylfysik och optik


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