Noise reduction of a Mach 0.7–0.9 jet by impinging microjets

Thomas Castelain; Jean-Christophe Béra; Michel Sunyach

doi:10.1016/j.crme.2006.01.001

Noise reduction of a Mach 0.7–0.9 jet by impinging microjets

Presented by: Geneviève Comte-Bellot

Thomas Castelain ¹ ; Jean-Christophe Béra ^1,²; Michel Sunyach ¹

¹ Centre acoustique, 36, avenue Guy-de-Collongue, 69134 Ecully, France
² INSERM U556, 151, cours Albert-Thomas, 69424 Lyon cedex 03, France

Comptes Rendus. Mécanique, Volume 334 (2006) no. 2, pp. 98-104.

Abstract
Résumé

A global noise reduction of a high-subsonic jet is achieved by experimental use of an impinging microjets system. The microjet velocity relative to the main jet velocity, the longitudinal distance of injection and the number of microjets are the three parameters examined in order to obtain the maximum noise reduction. This optimized microjet configuration is obtained by a balance between low-frequency attenuation and high-frequency noise generation due to the interaction between the microjets and the main jet mixing layer.

Cette étude concerne la réduction du bruit global d'un jet subsonique par un système de microjets impactants. Le rapport entre la vitesse des microjets et celle du jet principal, la distance longitudinale d'injection et le nombre de microjets sont les trois paramètres présentement étudiés pour atteindre un maximum de réduction de bruit. La configuration dite optimale correspond à un équilibre entre la réduction de bruit en basse fréquence et une régénération de bruit en haute fréquence due à l'interaction entre les microjets et la couche de mélange du jet principal.

Received: 2005-12-10
Accepted: 2006-01-10
Published online: 2006-02-01

DOI: 10.1016/j.crme.2006.01.001

Keywords: Fluid mechanics, Jet, Noise reduction, Microjet
Mots-clés : Mécanique des fluides, Jet, Réduction de bruit, Microjet

Author's affiliations:

Thomas Castelain ¹; Jean-Christophe Béra ^{1, 2}; Michel Sunyach ¹

¹ Centre acoustique, 36, avenue Guy-de-Collongue, 69134 Ecully, France
² INSERM U556, 151, cours Albert-Thomas, 69424 Lyon cedex 03, France

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     author = {Thomas Castelain and Jean-Christophe B\'era and Michel Sunyach},
     title = {Noise reduction of a {Mach} 0.7{\textendash}0.9 jet by impinging microjets},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {98--104},
     publisher = {Elsevier},
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     number = {2},
     year = {2006},
     doi = {10.1016/j.crme.2006.01.001},
     language = {en},
}

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Thomas Castelain; Jean-Christophe Béra; Michel Sunyach. Noise reduction of a Mach 0.7–0.9 jet by impinging microjets. Comptes Rendus. Mécanique, Volume 334 (2006) no. 2, pp. 98-104. doi : 10.1016/j.crme.2006.01.001. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2006.01.001/

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