Noise radiated by a non-isothermal, temporal mixing layer |
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Authors: | François Golanski Véronique Fortuné Eric Lamballais |
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Institution: | (1) Laboratoire d'études Aérodynamiques, Centre National de la Recherche Scientifique, Université de Poitiers, 40 avenue du Recteur Pineau, 86022 Poitiers Cedex, France |
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Abstract: | The ability of Lighthill's analogy to predict the sound radiated by a transitional mixing layer is evaluated by means of direct
numerical simulation (DNS). The specific case of low Mach number flows with density variations is investigated. In order to
limit the global computational cost, the acoustic source information is based on numerical results where the sound waves have
been removed. It is shown that the low Mach number approximation coupled with the acoustic analogy can lead to very accurate
predictions for the radiated sound if the acoustic sources in Lighthill's equation are taken into account carefully. Results
for the acoustic intensity deduced from a repeated use of the Lighthill's analogy over a wide range of Mach numbers allow
us to discuss the adequacy of scaling laws proposed by previous authors (J. Sound Vib. 28(3), 563–585, 1973; 31(4), 391–397, 1973; 48(1), 95–111, 1976) for the prediction of noise from hot jets. |
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Keywords: | Aeroacoustics Analogy prediction DNS Low Mach number flow Temperature effects Scaling laws |
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