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Direct assessment of the acoustic scattering matrix of a turbulent swirl combustor by combining system identification, large eddy simulation and analytical approaches

Merk, Malte and Silva, Camilo and Polifke, Wolfgang and Gaudron, Renaud and Gatti, Marco and Mirat, Clément and Schuller, Thierry Direct assessment of the acoustic scattering matrix of a turbulent swirl combustor by combining system identification, large eddy simulation and analytical approaches. (2019) Journal of engineering for gas turbines and power, 141 (2). 1-9. ISSN 0742-4795

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Official URL: https://doi.org/10.1115/1.4040731

Abstract

This study assesses and compares two alternative approaches to determine the acoustic scattering matrix of a premixed turbulent swirl combustor: (1) The acoustic scattering matrix coefficients are obtained directly from a compressible large eddy simulation (LES). Specifically, the incoming and outgoing characteristic waves f and g extracted from the LES are used to determine the respective transmission and reflection coefficients via System Identification (SI) techniques. (2) The flame transfer function (FTF) is identi- fied from LES time series data of upstream velocity and heat release rate. The transfer matrix of the reactive combustor is then derived by combining the FTF with the Rankine–Hugoniot (RH) relations across a compact heat source and a transfer matrix of the cold combustor, which is deduced from a linear network model. Linear algebraic transformation of the transfer matrix consequently yields the combustor scattering matrix. In a cross-comparison study that includes comprehensive experimental data, it is shown that both approaches successfully predict the scattering matrix of the reactive tur- bulent swirl combustor

Item Type:Article
HAL Id:hal-02002017
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Other partners > Université Paris-Saclay (FRANCE)
Other partners > Technische Universität München - TUM (GERMANY)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > CentraleSupélec (FRANCE)
Laboratory name:
Funders:
German Research Foundation DFG - Agence Nationale de la Recherche - European Union
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Deposited On:16 Jan 2019 10:34

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