Réduction semi-active du battement de volume généré par une cavité profonde soumise à un écoulement aérodynamiqueSemi-active reduction of the sound generated by a deep cavity under an airflow |
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| Authors: | Xavier Amandolese Pascal Hemon Françoise Santi Jan Wojciechowski |
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| Institution: | 1. Institut Aérotechnique/CNAM, 15, rue Marat, 78210 Saint-Cyr l''École, France;2. CNAM, Département de mathématiques, Paris, France;3. École Polytechnique de Varsovie, Pologne |
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| Abstract: | We present experimental results obtained with a deep cavity, such as a Helmholtz resonator, excited by an airflow. The resonance under the action of the vortices generated in the shear layer is well described and quantified. The mounting of actuators, based on a few piezo-electric elements, allows us to generate a series of two-dimensional vortices forced at a frequency which is different than the natural resonance frequency. The sound level in the cavity is strongly decreased and only the broadband noise of the turbulence remains. To cite this article: X. Amandolese et al., C. R. Mecanique 330 (2002) 101–106. |
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| Keywords: | acoustique aéroacoustique résonateur couche de cisaillement instabilité contrôle acoustics aeroacoustics resonator shear layer instability control |
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