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ASSESSMENT OF A CAA METHODOLOGY FOR TURBULENCE-CASCADE INTERACTION NOISE PREDICTION AND REDUCTION FROM SERRATED AIRFOILS

Authors
  • Buszyk, Martin
  • Polacsek, Cyril
  • Le Garrec, Thomas
Publication Date
Jul 02, 2020
Source
HAL
Keywords
Language
English
License
Unknown
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Abstract

The acoustic response of a rectilinear cascade subjected to a grid turbulence will be analysed experimentally in a laboratory facility at the Ecole Centrale de Lyon in the framework of the H2020 European project InnoSTAT (https://cordis.europa.eu/project/id/865007). On this occasion, several noise reduction treatments will be evaluated. Here, we focus on the numerical prediction of one treatment proposed by ONERA: serrated leading edges. We performed several parametric studies on the baseline (untreated) geometry to assess the optimal simulation features for accurate and time effective calculations. In this parametric study two geometries are considered, namely NACA asymmetric airfoils and flat plates at zero incidence. The broadband noise simulations are carried out using a CAA code solving the linearized Euler equations, coupled with a stochastic turbulence generation. A particular attention is paid to the synthetic turbulence for which different formulations are considered, aiming at finding the best suited model for the studied configuration. Numerical cascade response is compared to that of an isolated flat plate using an analytical solution based on the Amiet formulation. Finally, the most suited numerical setup is applied to the low-noise cascade and acoustic performances of the designed serrations are assessed. The results are compared to an analytical method using the Wiener-Hopf technique, both showing close OAPWL reductions around 6 dB.

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