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Article Dans Une Revue AIAA Journal Année : 2013

Experimental and Numerical Investigation of Turbulence-Airfoil Noise Reduction Using Wavy Edges

Résumé

A passive leading edge treatment based on sinusoidal serrations aiming at reducing tur-bofan interaction noise has been recently studied in the framework of a European project (FLOCON). Turbulence-airfoil interaction mechanism is achieved using a turbulence grid located upstream of an isolated NACA airfoil tested in ISVR anechoic open jet wind tunnel. The experimental setup with several airfoils designed and manufactured by Onera is first presented with main acoustic results, highlighting the sound power level reductions obtained for all studied flow speeds (about 3-4 dB reduction) without altering the aerodynamic performances (as shown by available measurements and RANS calculations). Experimental investigations are supplemented by numerical predictions in order to assess the acoustic performances of the serrations. The method described in the second part of the paper is based on a CAA code solving the nonlinear Euler equations applied to the disturbances, and coupled to a Ffowcs-Williams and Hawkings formulation. Convection effects are achieved from a RANS solution or approximated by a fully uniform flow. The upstream turbulence is synthesized by means of a stochastic model and injected into the computational domain through an adapted boundary condition. It is first validated in 2D and 3D against academic flat plate configurations by comparison with Amiet solutions (ex-act in such cases). Finally, 3D computations are applied to FLOCON configurations. The present methodology is shown to reproduce the measured spectra and far-field directivities with a reasonably good precision. Radiated sound level attenuation due to the serrations versus frequency is fairly well assessed too.
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Dates et versions

hal-02085960 , version 1 (25-04-2019)

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Vincent Clair, Cyril Polacsek, Thomas Le Garrec, Gabriel Reboul, Mathieu Gruber, et al.. Experimental and Numerical Investigation of Turbulence-Airfoil Noise Reduction Using Wavy Edges. AIAA Journal, 2013, 51 (11), pp.2695-2713. ⟨10.2514/1.J052394⟩. ⟨hal-02085960⟩
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