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Publikationstyp: Konferenz: Paper
Art der Begutachtung: Peer review (Publikation)
Titel: Autoignition flame transfer matrix : analytical model versus large eddy simulations
Autor/-in: Gant, Francesco
Cuquel, Alexis
Bothien, Mirko
et. al: No
DOI: 10.21256/zhaw-23280
Angaben zur Konferenz: Symposium on Thermoacoustics in Combustion: Industry meets Academia (SoTiC 2021), 6 - 10 September 2021
Erscheinungsdatum: Sep-2021
Verlag / Hrsg. Institution: ZHAW Zürcher Hochschule für Angewandte Wissenschaften
Sprache: Englisch
Schlagwörter: Autoignition; Flame transfer matrix; Sequential combustion; Gas turbines; Rankine-Hugoniot conditions
Fachgebiet (DDC): 629: Luftfahrt- und Fahrzeugtechnik
Zusammenfassung: Modern gas turbines need to fulfill increasingly stringent emission targets on the one hand and exhibit outstanding operational and fuel flexibility on the other. Ansaldo Energia GT26 and GT36 gas turbine models address these requirements by employing a combustion system in which two lean premixed combustors are arranged in series. Due to the high inlet temperatures from the first stage, the second combustor stage predominantly relies on autoignition for flame stabilization. In this paper, the response of autoignition flames to temperature, pressure and velocity excitations is investigated. The gas turbine combustor geometry is represented by a backward-facing step. Based on the conservation equations an analytical model is derived by solving the linearized Rankine-Hugoniot conditions. This is a commonly used analytical approach to describe the relation of thermodynamic quantities up- and downstream of a propagation stabilized flame. In particular, the linearized Rankine-Hugoniot jump conditions are derived taking into account the presence of a moving discontinuity as well as upstream entropy inhomogeneities. The unsteady heat release rate of the flame is modeled as a linear superposition of flame transfer functions, accounting for velocity, pressure, and entropy disturbances, respectively. This results in a 3x3 flame transfer matrix relating both primitive acoustic variables and the temperature fluctuations across the flame. The obtained analytical expression is compared to large eddy simulations with excellent agreement. A discussion about the contribution of the single terms to the modeling effort is provided, with a focus on autoignition flames.
Weitere Angaben: Paper number 8436
Volltext Version: Publizierte Version
Lizenz (gemäss Verlagsvertrag): Lizenz gemäss Verlagsvertrag
Departement: School of Engineering
Organisationseinheit: Institut für Energiesysteme und Fluid-Engineering (IEFE)
Enthalten in den Sammlungen:Publikationen School of Engineering

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