Downstream subsonic jet noise: link with vortical structures intruding into the jet core

Christophe Bogey; Christophe Bailly

doi:10.1016/S1631-0721(02)01499-7

Downstream subsonic jet noise: link with vortical structures intruding into the jet core
[Rayonnement acoustique aval des jets subsoniques : lien avec l'intrusion de structures tourbillonnaires dans le cône potentiel]

Christophe Bogey ¹ ; Christophe Bailly ¹

¹ LMFA, UMR CNRS 5509, École centrale de Lyon, BP 163, 69134 Écully cedex, France

Comptes Rendus. Mécanique, Volume 330 (2002) no. 8, pp. 527-533.

Résumé
Abstract

Un jet circulaire subsonique avec un nombre de Mach de 0,9 et un nombre de Reynolds de 65 000 est calculé par une Simulation des Grandes Echelles (SGE) compressible, afin de déterminer le champ aérodynamique et le champ acoustique dans un même calcul. Le bruit rayonné par le jet, obtenu par SGE, est en bon accord avec les données expérimentales de la littérature, en terme de spectres, de niveaux et de directivité, ce qui démontre la faisabilité de ce calcul acoustique direct. Le mécanisme de production sonore prédominant est également étudié, en présentant une corrélation entre son rayonnement, observé pour un angle de 30° avec la direction de l'écoulement, et l'intrusion de structures tourbillonnaires dans le jet à la fin du cône potentiel.

A subsonic circular jet with a Mach number of 0.9 and a Reynolds number of 65 000 is computed by a compressible Large Eddy Simulation (LES) to determine both the flow field and the sound field in the same calculation. The noise radiated by the jet, provided by LES, is in good agreement with experimental data of the literature in terms of sound pressure spectra, levels and directivity, showing the feasibility of this direct noise calculation. The dominant sound generation mechanism is also investigated, by presenting a correlation between its radiation, observed for an angle of 30° from the downstream direction, and the intrusion of vortical structures into the jet core.

Reçu le : 2002-05-10
Accepté le : 2002-05-27
Publié le : 2002-01-01

DOI : 10.1016/S1631-0721(02)01499-7

Keywords: acoustics, jet noise, computational aeroacoustics, Large Eddy Simulation
Mots-clés : acoustique, bruit de jet, aéroacoustique numérique, Simulation des Grandes Echelles

Affiliations des auteurs :

Christophe Bogey ¹ ; Christophe Bailly ¹

¹ LMFA, UMR CNRS 5509, École centrale de Lyon, BP 163, 69134 Écully cedex, France

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     title = {Downstream subsonic jet noise: link with vortical structures intruding into the jet core},
     journal = {Comptes Rendus. M\'ecanique},
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Christophe Bogey; Christophe Bailly. Downstream subsonic jet noise: link with vortical structures intruding into the jet core. Comptes Rendus. Mécanique, Volume 330 (2002) no. 8, pp. 527-533. doi : 10.1016/S1631-0721(02)01499-7. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/S1631-0721(02)01499-7/

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