Tonal Noise Prediction of a Modern Turbofan Engine With Large Upstream and Downstream Distortion | Zendy

Majd Daroukh | Zendy; Stéphane Moreau | Zendy; Nicolas Gourdain | Zendy; JeanFrançois Boussuge | Zendy; Claude Sensiau | Zendy

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Tonal Noise Prediction of a Modern Turbofan Engine With Large Upstream and Downstream Distortion

Author(s) -

Majd Daroukh,

Stéphane Moreau,

Nicolas Gourdain,

JeanFrançois Boussuge,

Claude Sensiau

Publication year - 2018

Publication title -

journal of turbomachinery

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.972

H-Index - 112

eISSN - 1528-8900

pISSN - 0889-504X

DOI - 10.1115/1.4042163

Subject(s) - turbofan , inlet , distortion (music) , aeroacoustics , noise (video) , acoustics , annulus (botany) , impeller , mechanics , mechanical fan , wake , upstream (networking) , computational fluid dynamics , dynamic mode decomposition , physics , engineering , aerospace engineering , computer science , materials science , sound pressure , mechanical engineering , telecommunications , image (mathematics) , amplifier , bandwidth (computing) , composite material , artificial intelligence

December 16-21, 2017 Abstract Ultra High Bypass Ratio (UHBR) engines are designed as compact as possible and are characterized by a short asymmetric air inlet and heterogeneous Outlet Guide Vanes (OGVs). e ow close to the fan is therefore circumferentially non-uniform (or distorted) and the resulting noise might be impacted. is is studied here at take-o conditions by means of a simulation of the Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations of a full-annulus fan stage. e model includes an asymmetric air inlet, a fan, an heterogeneous OGV row and homogeneous Inlet Guide Vanes (IGVs). Direct acoustic predictions are given for both inlet and a noise. A ltering procedure based on a modal decomposition is applied for the a noise analysis. e noise mechanisms that are generally considered (i.e. the interaction of fan-blade wakes with OGVs and the fan self-noise) are shown to be impacted by the distortion. In addition, new sources caused by the interaction of the stationnary distortion with the fan blades appear and contribute to the inlet noise.

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