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 nonuniform (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 noises. 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 stationary distortion and the fan blades appear and contribute to the inlet noise.
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Tonal Noise Prediction of a Modern Turbofan Engine With Large Upstream and Downstream Distortion
Majd Daroukh
,
Majd Daroukh
CFD Team,
CERFACS,
Toulouse 31100, France;
CERFACS,
Toulouse 31100, France;
Department of Aerodynamics and Acoustics,
Safran Aircraft Engines,
Moissy-Cramayel 77550, France
e-mail: majd.daroukh@hotmail.fr
Safran Aircraft Engines,
Moissy-Cramayel 77550, France
e-mail: majd.daroukh@hotmail.fr
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Stéphane Moreau
,
Stéphane Moreau
Mechanical Engineering Department,
University of Sherbrooke,
Sherbrooke, QC J1K 2R1, Canada
e-mail: stephane.smoreau@gmail.com
University of Sherbrooke,
Sherbrooke, QC J1K 2R1, Canada
e-mail: stephane.smoreau@gmail.com
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Nicolas Gourdain
,
Nicolas Gourdain
Department of Aerodynamics,
Energetics and Propulsion,
ISAE-Supaero,
University of Toulouse,
Toulouse 31400, France
Energetics and Propulsion,
ISAE-Supaero,
University of Toulouse,
Toulouse 31400, France
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Jean-François Boussuge
,
Jean-François Boussuge
CFD Team,
CERFACS,
Toulouse 31100, France
CERFACS,
Toulouse 31100, France
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Claude Sensiau
Claude Sensiau
Department of Aerodynamics and Acoustics,
Safran Aircraft Engines,
Moissy-Cramayel 77550, France
Safran Aircraft Engines,
Moissy-Cramayel 77550, France
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Majd Daroukh
CFD Team,
CERFACS,
Toulouse 31100, France;
CERFACS,
Toulouse 31100, France;
Department of Aerodynamics and Acoustics,
Safran Aircraft Engines,
Moissy-Cramayel 77550, France
e-mail: majd.daroukh@hotmail.fr
Safran Aircraft Engines,
Moissy-Cramayel 77550, France
e-mail: majd.daroukh@hotmail.fr
Stéphane Moreau
Mechanical Engineering Department,
University of Sherbrooke,
Sherbrooke, QC J1K 2R1, Canada
e-mail: stephane.smoreau@gmail.com
University of Sherbrooke,
Sherbrooke, QC J1K 2R1, Canada
e-mail: stephane.smoreau@gmail.com
Nicolas Gourdain
Department of Aerodynamics,
Energetics and Propulsion,
ISAE-Supaero,
University of Toulouse,
Toulouse 31400, France
Energetics and Propulsion,
ISAE-Supaero,
University of Toulouse,
Toulouse 31400, France
Jean-François Boussuge
CFD Team,
CERFACS,
Toulouse 31100, France
CERFACS,
Toulouse 31100, France
Claude Sensiau
Department of Aerodynamics and Acoustics,
Safran Aircraft Engines,
Moissy-Cramayel 77550, France
Safran Aircraft Engines,
Moissy-Cramayel 77550, France
1
Corresponding authors.
Manuscript received April 2, 2018; final manuscript received November 26, 2018; published online January 31, 2019. Assoc. Editor: Coutier-Delgosha Olivier.
J. Turbomach. Feb 2019, 141(2): 021010 (11 pages)
Published Online: January 31, 2019
Article history
Received:
April 2, 2018
Revised:
November 26, 2018
Citation
Daroukh, M., Moreau, S., Gourdain, N., Boussuge, J., and Sensiau, C. (January 31, 2019). "Tonal Noise Prediction of a Modern Turbofan Engine With Large Upstream and Downstream Distortion." ASME. J. Turbomach. February 2019; 141(2): 021010. https://doi.org/10.1115/1.4042163
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