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Mechanisms and active control of jet-induced noise

Babucke, Andreas and Spagnoli, Bruno and Airiau, Christophe and Kloker, Markus and Rist, Ulrich Mechanisms and active control of jet-induced noise. (2009) 75-98.

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Official URL: http://www.springer.com/engineering/mechanical+engineering/book/978-3-540-89955-6

Abstract

Fundamental mechanisms of jet noise are investigated by means of direct numerical simulation. In the mixing layer, subharmonics of the respective vortex pairing are found to be responsible for the main part of the generated noise which is directed in downstream direction. By modifying the phase shift between introduced disturbances it is possible to diminish or enhance relevant portions of the emitted sound. Optimal control has been applied successfully to a plane mixing layer. In the far field, the mean noise level could be reduced. Depending on the measurement line, some distributed control or anti-noise is generated by the control. A more realistic configuration is achieved by adding a splitter plate representing the nozzle end. Rectangular serrations lead to a breakdown of the large coherent spanwise vortical structures and thus provide a noise reduction of 9dB.

Item Type:Article
Additional Information: Thanks to Springer editor. The definitive version is available at http://www.springer.com/engineering/mechanical+engineering/book/978-3-540-89955-6
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Universität Stuttgart (GERMANY)
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Deposited On:06 Jun 2013 10:26

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