Numerical predictions of turbulence-cascade interaction noise using CAA with a stochastic model

Clair, V., Polacsek, C., Le Garrec, T. and Jacob, M. (2014) Numerical predictions of turbulence-cascade interaction noise using CAA with a stochastic model. 20th AIAA/CEAS Aeroacoustics Conference, Atlanta, United States. 16 - 20 Jun 2014. (doi:10.2514/6.2014-2453).

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

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