Identification of aero-acoustic scattering matrices from large eddy simulation. Application to a sudden area expansion of a duct

2012 ◽  
Vol 331 (13) ◽  
pp. 3096-3113 ◽  
Author(s):  
S. Föller ◽  
W. Polifke
Keyword(s):  
Large Eddy Simulation ◽  
Acoustic Scattering ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Scattering Matrices ◽  
Area Expansion

Identification of aero-acoustic scattering matrices from large eddy simulation: Application to whistling orifices in duct

2013 ◽  
Vol 332 (20) ◽  
pp. 5059-5067 ◽  
Author(s):  
R. Lacombe ◽  
S. Föller ◽  
G. Jasor ◽  
W. Polifke ◽  
Y. Aurégan ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
Acoustic Scattering ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Scattering Matrices

scholarly journals Direct Assessment of the Acoustic Scattering Matrix of a Turbulent Swirl Combustor by Combining System Identification, Large Eddy Simulation and Analytical Approaches

2018 ◽  
Vol 141 (2) ◽  
Author(s):  
Malte Merk ◽  
Camilo Silva ◽  
Wolfgang Polifke ◽  
Renaud Gaudron ◽  
Marco Gatti ◽  
...  
Keyword(s):  
System Identification ◽  
Large Eddy Simulation ◽  
Transfer Matrix ◽  
Acoustic Scattering ◽  
Scattering Matrix ◽  
Series Data ◽  
Swirl Combustor ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Analytical Approaches

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 identified 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 turbulent swirl combustor.

scholarly journals Direct Assessment of the Acoustic Scattering Matrix of a Turbulent Swirl Combustor by Combining System Identification, Large Eddy Simulation and Analytical Approaches

2018 ◽  
Author(s):  
Malte Merk ◽  
Camilo Silva ◽  
Wolfgang Polifke ◽  
Renaud Gaudron ◽  
Marco Gatti ◽  
...  
Keyword(s):  
System Identification ◽  
Large Eddy Simulation ◽  
Transfer Matrix ◽  
Acoustic Scattering ◽  
Scattering Matrix ◽  
Series Data ◽  
Swirl Combustor ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Analytical Approaches

This study assesses and compares two alternative approaches to determine the acoustic scattering matrix of a pre-mixed 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 techniques. 2) The flame transfer function (FTF) is identified 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 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. A cross-comparison study that includes comprehensive experimental data shows that both approaches successfully predict the scattering matrix of the reactive turbulent swirl combustor.

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