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Prédiction de l'aéroacoustique de jets subsoniques confinés à l'aide d'une méthode stochastique de génération de la turbulence

Abstract : In air exchangers, the cool air flow can be produced by jet pumps. These devices, which can be consideredas subsonic jets confined in ducts, could contribute directly to ramp noise. A predictive numerical toolof the acoustic radiated by jet pumps is therefore developped in order to be able to propose appropriatenoise reduction solutions. This tool is adapted to Liebherr Aerospace’s industrial context. A stochasticmethod allows, starting from a steady RANS computation, to synthetise a turbulent velocity fields andto enforce source terms in the linearized Euler equations therefore used as a wave propagator. A newstochastic model relying on the sweeping hypothesis is developped. Unsteady fields reproducing someaerodynamics features of a free subsonic jet flow can be generated. This method is then coupled withOnera’s Euler solver sAbrinA_v0 and the resulting tool is applied on a free subsonic jet configuration atMach 0.72. Assuming a cabration of the source terms, this methodology models properly the far fieldacoustic spectra except for small angles. The numerical tool is then coupled with a FW-H solver to studya realistic jet pump. Aerodynamic and acoustic results are validated by comparison with a data baseobtained from an experimental campaign including laser Doppler anemometry measures inside the ductand pressure recording in the far-field.
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https://tel.archives-ouvertes.fr/tel-00805414
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  • HAL Id : tel-00805414, version 1

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Anthony Lafitte. Prédiction de l'aéroacoustique de jets subsoniques confinés à l'aide d'une méthode stochastique de génération de la turbulence. Autre. Ecole Centrale de Lyon, 2012. Français. ⟨NNT : 2012ECDL0037⟩. ⟨tel-00805414⟩

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