Modal analysis of in-duct fan broadband noise via an iterative Bayesian inverse approach

Pereira, Antonio; Jacob, Marc C.

doi:10.1016/j.jsv.2021.116633

Cited by 22 publications

(6 citation statements)

References 48 publications

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“…At the intake section (Figure 5 (a)), the modal content is seen to be slightly dominated by co-rotating modes ( > 0, which rotate in the same direction as the rotor). This co-rotating mode distribution was also observed experimentally on a fan stage at approach condition [33] and was related to the rotor-stator interaction noise source at the stator leading edge. This can be explained by observing the direction of the dipolar sources corresponding to the rotor-stator interaction noise, as shown in Figure 6.…”

Section: Modal Decompositionsupporting

confidence: 71%

Direct noise predictions of a 360° full fan stage using LES

Al-Am

Clair

Giauque

et al. 2023

AIAA AVIATION 2023 Forum

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In the present study, the broadband noise of an ultra high bypass ratio fan/OGV stage, developed at École Centrale de Lyon, is studied numerically. Wall-modeled large eddy simulations (LES) over a 360°full fan stage are performed for the first time, at approach conditions. The noise emissions in the fan stage are directly obtained by the fully compressible LES, using a well refined unstructured grid. Additionally, a LES over a periodic sector of the fan stage is performed using the same configuration and numerical setup as for the 360°LES. The results of the 360°and the periodic sector configurations are compared in terms of mean and turbulent flow parameters and acoustic pressure spectra. The impact of the periodic boundary conditions, usually used for high-fidelity simulations of turbofan engines, is thus assessed. A slightly lower pressure difference between the pressure and suction sides of the blade is obtained in the 360°LES in the blade tip region. The acoustic azimuthal decomposition, which can only be estimated using the 360°LES configuration, is presented. The evolution of the coherence function in the azimuthal direction is also studied, particularly between monitor points located in separate blade channels. The coherence functions in the radial and azimuthal directions between monitor points located in the same blade channel are compared between the 360°and the periodic sector configurations. Lower coherence levels are obtained in the 360°LES mainly at low and mid frequencies.

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Section: Modal Decompositionsupporting

confidence: 71%

Direct noise predictions of a 360° full fan stage using LES

Al-Am

Clair

Giauque

et al. 2023

AIAA AVIATION 2023 Forum

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“…In-duct acoustic measurements and post-processing methods were presented and described by Tapken et al [38]. Pereira and Jacob [39] obtained very similar results using their own post-processing treatment.…”

Section: Frpm-fan Methods Applied To the Acat1 Fanmentioning

confidence: 80%

Comparison of predicted fan broadband noise using a two- versus a three-dimensional synthetic turbulence method

Kissner

Guérin

2021

Journal of Sound and Vibration

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“…14. -Innovative optical measurements: Schlieren imaging, interferometry, Rayleigh scattering [30], [31] -Innovative microphone arrays techniques, inverse problems, 3D sound field reconstruction [32], [33], [34], Fig. 15.…”

Section: Collaborations and Research Philosophymentioning

confidence: 99%

“…Figure 15. Wavenumber-frequency analysis of induct fan broadband noise using a Bayesian approach, [34].…”

Section: Collaborations and Research Philosophymentioning

confidence: 99%

The Acoustic center of Ecole centrale de Lyon from 1970 to today

Juve,

Blanc-Benon

2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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The research team in acoustics at Ecole centrale de Lyon was created 50 years ago by Prof. Geneviève Comte-Bellot. In this paper we describe the growth of this team, known now as the Acoustic center of Ecole centrale de Lyon (or Centre Acoustique in French), from the early 70s to today. The evolution of the research interests and of the experimental facilities is emphasized, and a selection of "historical" references is given at the end of the paper. The main current research topics are also listed, illustrated and completed by a partial list of recent references.

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Modal analysis of in-duct fan broadband noise via an iterative Bayesian inverse approach

Cited by 22 publications

References 48 publications

Direct noise predictions of a 360° full fan stage using LES

Direct noise predictions of a 360° full fan stage using LES

Comparison of predicted fan broadband noise using a two- versus a three-dimensional synthetic turbulence method

The Acoustic center of Ecole centrale de Lyon from 1970 to today

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