A global analysis of tonal noise in flows around aerofoils - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Journal of Fluid Mechanics Année : 2014

A global analysis of tonal noise in flows around aerofoils

Résumé

The generation of discrete acoustic tones in the compressible flow around an aerofoil is addressed in this work by means of nonlinear numerical simulations and global stability analyses. The nonlinear simulations confirm the appearance of discrete tones in the acoustic spectrum and, for the chosen flow case, the global stability analyses of the mean-flow dynamics reveal that the linearized operator is stable. However, the flow response to incoming disturbances exhibits important transient growth effects that culminate in the onset of aeroacoustic feedback loops, involving instability processes on the suction- and pressure-surface boundary layers together with their cross-interaction by acoustic radiation at the trailing edge. The features of the aeroacoustic feedback loops and the appearance of discrete tones are then related to the features of the least-stable modes in the global spectrum: the spatial structure of the direct modes displays the coupled dynamics of hydrodynamic instabilities on the suction surface and in the near wake. Finally, different families of global modes will be identified and the dynamics that they represent will be discussed.
Fichier principal
Vignette du fichier
S0022112014003565a (2).pdf (2.82 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Fichier non déposé

Dates et versions

hal-01075007 , version 1 (26-10-2014)

Identifiants

Citer

Miguel Fosas de Pando, Peter J. Schmid, Denis Sipp. A global analysis of tonal noise in flows around aerofoils. Journal of Fluid Mechanics, 2014, 754 (september), pp.5-38. ⟨10.1017/jfm.2014.356⟩. ⟨hal-01075007⟩
312 Consultations
254 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More