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Investigation of mixing processes of effusion cooling air and main flow in a single sector model gas turbine combustor at elevated pressure

Greifenstein, Max ; Dreizler, Andreas (2021)
Investigation of mixing processes of effusion cooling air and main flow in a single sector model gas turbine combustor at elevated pressure.
In: International Journal of Heat and Fluid Flow, 88
doi: 10.1016/j.ijheatfluidflow.2020.108768
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Mixing processes between main flow and effusion cooling air are investigated in an effusion cooled, swirl-stabilized pressurized single sector gas turbine combustor using advanced laser diagnostics. Quantitative planar laser-induced fluorescence of the hydroxyl radical (OH-PLIF) and planar laser-induced fluorescence of nitric oxide, seeded to the effusion cooling air, (NO-PLIF) are employed in the primary zone and close to the effusion cooled liner. This data is used to identify mixing events at three stages of premixed combustion, i.e. mixing before reaction, mixing during reaction and mixing after reaction. A parametric study of swirl and cooling air mass flow is conducted to investigate the mutual interaction between flame and cooling air. Within the primary zone, a significant radial asymmetry of OH concentration is observed. This asymmetry is partly explained by the presence of effusion cooling air within the unburned fresh gas, leading to lowered OH concentration within local reaction zones and their post-flame equilibrium concentration. Near the effusion cooled liner, adiabatic mixing after reaction is the dominant process across all investigated operating conditions. Notable mixing before reaction is only observed for the first effusion hole on the center line at low swirl conditions.

Typ des Eintrags: Artikel
Erschienen: 2021
Autor(en): Greifenstein, Max ; Dreizler, Andreas
Art des Eintrags: Bibliographie
Titel: Investigation of mixing processes of effusion cooling air and main flow in a single sector model gas turbine combustor at elevated pressure
Sprache: Englisch
Publikationsjahr: 6 Januar 2021
Verlag: Elsevier
Titel der Zeitschrift, Zeitung oder Schriftenreihe: International Journal of Heat and Fluid Flow
Jahrgang/Volume einer Zeitschrift: 88
DOI: 10.1016/j.ijheatfluidflow.2020.108768
URL / URN: https://www.sciencedirect.com/science/article/pii/S0142727X2...
Kurzbeschreibung (Abstract):

Mixing processes between main flow and effusion cooling air are investigated in an effusion cooled, swirl-stabilized pressurized single sector gas turbine combustor using advanced laser diagnostics. Quantitative planar laser-induced fluorescence of the hydroxyl radical (OH-PLIF) and planar laser-induced fluorescence of nitric oxide, seeded to the effusion cooling air, (NO-PLIF) are employed in the primary zone and close to the effusion cooled liner. This data is used to identify mixing events at three stages of premixed combustion, i.e. mixing before reaction, mixing during reaction and mixing after reaction. A parametric study of swirl and cooling air mass flow is conducted to investigate the mutual interaction between flame and cooling air. Within the primary zone, a significant radial asymmetry of OH concentration is observed. This asymmetry is partly explained by the presence of effusion cooling air within the unburned fresh gas, leading to lowered OH concentration within local reaction zones and their post-flame equilibrium concentration. Near the effusion cooled liner, adiabatic mixing after reaction is the dominant process across all investigated operating conditions. Notable mixing before reaction is only observed for the first effusion hole on the center line at low swirl conditions.

Freie Schlagworte: Gas turbine, Effusion cooling, Laser diagnostics, Quantitative OH-LIF, NO-LIF, Flame-cooling air interaction
Fachbereich(e)/-gebiet(e): 16 Fachbereich Maschinenbau
16 Fachbereich Maschinenbau > Fachgebiet Reaktive Strömungen und Messtechnik (RSM)
Hinterlegungsdatum: 27 Okt 2021 07:36
Letzte Änderung: 27 Okt 2021 07:36
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