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.
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Babucke, A., Spagnoli, B., Airiau, C., Kloker, M., Rist, U. (2009). Mechanisms and Active Control of Jet-Induced Noise. In: Brun, C., Juvé, D., Manhart, M., Munz, CD. (eds) Numerical Simulation of Turbulent Flows and Noise Generation. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 104. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-89956-3_4
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DOI: https://doi.org/10.1007/978-3-540-89956-3_4
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