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research-article

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

[+] Author and Article Information
Majd Daroukh

CFD Team, CERFACS, Toulouse, France & Department of Aerodynamics and Acoustics, Safran Aircraft Engines, Moissy-Cramayel, France
majd.daroukh@hotmail.fr

Stéphane Moreau

Mechanical Engineering Department, University of Sherbrooke, Sherbrooke, Canada
stephane.smoreau@gmail.com

Nicolas Gourdain

Department of Aerodynamics, Energetics and Propulsion, ISAE-Supaero, University of Toulouse, Toulouse, France
nicolas.gourdain@isae.fr

Jean-Francois Boussuge

CFD Team, CERFACS, Toulouse, France
boussuge@cerfacs.fr

Clause Sensiau

Department of Aerodynamics and Acoustics, Safran Aircraft Engines, Moissy-Cramayel, France
claude.sensiau@safrangroup.com

1Corresponding author.

ASME doi:10.1115/1.4042163 History: Received April 02, 2018; Revised November 26, 2018

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). The flow close to the fan is therefore circumferentially non-uniform (or distorted) and the resulting noise might be impacted. This is studied here at take-off conditions by means of a simulation of the Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations of a full-annulus fan stage. The model includes an asymmetric air inlet, a fan, heterogeneous OGVs and homogeneous Inlet Guide Vanes (IGVs). Direct acoustic predictions are given for both inlet and aft noise. A novel hydrodynamic/acoustic splitting method based on a modal decomposition is developed and is applied for the aft noise analysis. The noise mechanisms that are generally considered (i.e. interaction of fan-blade wakes with OGVs and fan self-noise) are shown to be impacted by the distortion. In addition, new sources caused by the interaction between the stationnary distortion and the fan blades appear and contribute to the inlet noise.

Copyright (c) 2018 by ASME
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