Comptes Rendus
Estimation of aerodynamic noise generated by forced compressible round jets
Comptes Rendus. Mécanique, Volume 334 (2006) no. 5, pp. 285-291.

An acoustic numerical code based on Ligthill's analogy is combined with large-eddy simulations techniques in order to evaluate the noise emitted by subsonic (M=0.7) and supersonic (M=1.4) round jets. We show first that, for centerline Mach number M=0.9 and Reynolds number Re=3.6×103, acoustic intensities compare satisfactorily with experimental data of the literature in terms of levels and directivity. Afterwards, high Reynolds number (Re=3.6×104) free and forced jets at Mach 0.7 and 1.4 are studied. Numerical results show that the jet noise intensity depends on the nature of the upstream mixing layer. Indeed, the subsonic jet is 4 dB quieter than the free jet when acting on this shear layer by superposing inlet varicose and flapping perturbations at preferred and first subharmonic frequency, respectively. The maximal acoustic level of the supersonic jet is, on the other hand, 3 dB lower than the free one with a flapping upstream perturbation at the second subharmonic. The results reported in this paper confirm previous works presented in the literature demonstrating that jet noise may be modified according to the inlet conditions.

Un code numérique d'acoustique basé sur l'analogie de Lighthill est combiné avec des simulations de grandes échelles de jets ronds compressibles, afin de déterminer le bruit rayonné par les jets subsoniques (M=0,7) et supersoniques (M=1,4). On montre d'abord que, pour un nombre de Mach de 0.9 et un nombre de Reynolds de 3,6×103, les intensités acoustiques ont un accord satisfaisant avec les données expérimentales de la littérature, en terme de niveaux et de directivité. On étudie ensuite des jets libres et forcés à des nombres de Mach de 0,7 et 1,4 et des nombres de Reynolds élevés (Re=3,6×104). Les résultats numériques montrent que l'intensité du bruit du jet dépend de l'état de la couche de mélange amont. En effet, le jet subsonique est 4 dB plus silencieux que le jet libre lorsque l'on manipule sa couche de mélange amont en superposant la combinaison d'une perturbation variqueuse et d'une alternée au mode préférentiel et sous-harmonique, respectivement. Au contraire, le niveau de bruit du jet supersonique est 3 dB plus faible que le jet libre avec une perturbation amont alternée au deuxième mode sous-harmonique. Les résultats obtenus confirment des travaux antérieurs présentés dans la littérature et montrant que le bruit des jets peut être modifié selon les conditions amont.

Received:
Accepted:
Published online:
DOI: 10.1016/j.crme.2006.03.006
Keywords: Computational fluid mechanics, Acoustics, Turbulence, Compressible jets control
Mot clés : Mécanique des fluides numérique, Acoustique, Turbulence, Contrôle de jets compressibles

Mohamed Maidi 1

1 Équipe MoST/LEGI, B.P. 53, 38041 Grenoble cedex 09, France
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Mohamed Maidi. Estimation of aerodynamic noise generated by forced compressible round jets. Comptes Rendus. Mécanique, Volume 334 (2006) no. 5, pp. 285-291. doi : 10.1016/j.crme.2006.03.006. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2006.03.006/

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