Effect of a tab on the aerodynamical development and noise of an underexpanded supersonic jet

Benoît André; Thomas Castelain; Christophe Bailly

doi:10.1016/j.crme.2013.08.001

Effect of a tab on the aerodynamical development and noise of an underexpanded supersonic jet

Benoît André ¹ ; Thomas Castelain ^1,² ; Christophe Bailly ^1,³

¹ Ecole centrale de Lyon, université de Lyon, laboratoire de mécanique des fluides et dʼacoustique, UMR CNRS 5509, 36, avenue Guy-de-Collongue, 69134 Écully cedex, France
² Université Lyon-1, 43, boulevard du 11-Novembre-1918, 69622 Villeurbanne cedex, France
³ Institut universitaire de France, 103, boulevard Saint-Michel, 75005 Paris, France

Comptes Rendus. Mécanique, Volume 341 (2013) no. 9-10, pp. 659-666.

Résumé

Mechanical tabs are often used as a screech-suppressing device in order to study broadband shock-associated noise (BBSAN). In this study, various experimental methods are used to characterise the effect of a tab on the development and noise of an underexpanded supersonic round jet. It is shown that the jet development is considerably modified by the introduction of the tab in that the shock spacing is shortened and the shock-cell pattern loses axisymmetry and strength. Moreover, the broadband shock-associated noise radiated by the tabbed jet is compared to that of a jet in which screech was suppressed by means of a notched nozzle. The peak frequency of BBSAN for the tabbed jet approximately matches that of the notched counterpart, but the amplitude of this noise component was seen to be smaller for the former jet. More importantly, the axisymmetry of the acoustic field is lost when using a tab, resulting in a dependence of measurements on the location of the tab relatively to the microphones. It is concluded that the use of a tab should be avoided to remove screech when studying broadband shock-associated noise.

Reçu le : 2012-05-07
Accepté le : 2013-08-08
Publié le : 2013-09-01

DOI : 10.1016/j.crme.2013.08.001

Mots clés : Aeroacoustics, Supersonic jet, Screech suppression, Tab

Affiliations des auteurs :

Benoît André ¹ ; Thomas Castelain ^{1, 2} ; Christophe Bailly ^{1, 3}

¹ Ecole centrale de Lyon, université de Lyon, laboratoire de mécanique des fluides et dʼacoustique, UMR CNRS 5509, 36, avenue Guy-de-Collongue, 69134 Écully cedex, France
² Université Lyon-1, 43, boulevard du 11-Novembre-1918, 69622 Villeurbanne cedex, France
³ Institut universitaire de France, 103, boulevard Saint-Michel, 75005 Paris, France

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     title = {Effect of a tab on the aerodynamical development and noise of an underexpanded supersonic jet},
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Benoît André; Thomas Castelain; Christophe Bailly. Effect of a tab on the aerodynamical development and noise of an underexpanded supersonic jet. Comptes Rendus. Mécanique, Volume 341 (2013) no. 9-10, pp. 659-666. doi : 10.1016/j.crme.2013.08.001. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2013.08.001/

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