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Tonal dynamics and sound in subsonic turbulent jets

Jaunet, Vincent and Jordan, Peter and Cavalieri, André V. and Towne, Aaron and Colonius, Tim and Schmidt, Oliver and Brès, Guillaume A. (2016) Tonal dynamics and sound in subsonic turbulent jets. In: 22nd AIAA/CEAS Aeroacoustics Conference, 30 May-1 June 2016, Lyon, France.

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Acoustic waves trapped in the potential core of subsonic turbulent jets have recently been observed and explained by Towne et al. We show that these waves also radiate outside the jet, primarily into the upstream arc. We provide an experimental identification of the Mach-number dependence of the phenomenon, which indicates that the modes are active even when evanescent, probably due to turbulent forcing. Finally, we show that for Mach numbers lower than about 0.8, the strong tonal dynamics and sound radiation (up to 170dB) that occur when a sharp edge is placed close to the jet are related to a resonance mechanism involving convective hydrodynamic wavepackets and a ‘slow’, upstreampropagating, trapped acoustic mode. A Helmholtz scaling of the resonance at higher Mach number suggests involvement of the ‘fast’ trapped modes in the range 0.8 ≤ M ≤ 1.

Item Type:Conference or Workshop Item (Paper)
Related URLs:
URLURL TypeDescription Paper Paper
Jordan, Peter0000-0001-8576-5587
Cavalieri, André V.0000-0003-4283-0232
Towne, Aaron0000-0002-7315-5375
Colonius, Tim0000-0003-0326-3909
Schmidt, Oliver0000-0002-7097-0235
Brès, Guillaume A.0000-0003-2507-8659
Additional Information:© 2016 by P. Jordan, CNRS. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. Published Online: 27 May 2016.
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Other Numbering System NameOther Numbering System ID
AIAA Paper2016-3016
Record Number:CaltechAUTHORS:20190709-092059115
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96952
Deposited By: Melissa Ray
Deposited On:09 Jul 2019 20:48
Last Modified:16 Nov 2021 17:24

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