Université de Lyon (92 rue Pasteur - CS 30122, 69361 Lyon Cedex 07 - France)
Abstract : Turbulent flow interactions with the outlet guide vanes are known to be mainly contributing to broadband noise emission of aeroengines at approach conditions. This paper presents a 3D CAA hybrid method aiming at simulating the aeroacoustic response of an annular cascade impacted by a prescribed homogeneous isotropic turbulent flow. It is based on a time-domain Euler solver coupled to a synthetic turbulence model implemented in the code by means of a suited inflow boundary condition proposed by Tam. The fluctuating pressure over the airfoil surface provided by CAA is used as an input to a FWH integral to calculate the radiated sound field. The method is first validated against an academic CAA benchmark in the case of a harmonic gust interacting with an annular flat plate cascade. Then, simulations are applied to turbulence-cascade interactions for annular configurations, in uniform and swirling mean flows, and numerical results in terms of sound power spectra in the outlet duct are compared to semi-analytical and numerical solutions, and to an available experiment.
https://hal-onera.archives-ouvertes.fr/hal-01067864
Contributor : Véronique Soullier
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Submitted on : Wednesday, September 24, 2014 - 11:28:46 AM
Last modification on : Wednesday, November 20, 2019 - 2:32:19 AM
Long-term archiving on: Friday, April 14, 2017 - 2:13:54 PM
V. Clair, C. Polacsek, T. Le Garrec, M.C. Jacob. Numerical Predictions of Turbulence-Cascade Interaction Noise Using CAA with a Stochastic Model. 20th AIAA/CEAS Aeroacoustics Conference, Jun 2014, ATLANTA, United States. ⟨hal-01067864⟩
