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Analytical prediction of boundary layer ingestion noise for an integrated turbofan

Staggat, Martin and Moreau, Antoine and Guerin, Sebastien (2019) Analytical prediction of boundary layer ingestion noise for an integrated turbofan. In: Proceedings of the 26th International Congress on Sound and Vibration, ICSV 2019. 26th International Congress on Sound and Vibration (ICSV), 07.-11. Jul. 2019, Montréal, Kanada. ISBN 978-199918100-0

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Abstract

A parametric study based on the analytical predictions of tonal and broadband noise for a generic turbulent boundary layer interacting with the rotor of an ultra high bypass ratio fan is presented. The approach and take-off conditions are considered. To classify the importance of ingestion noise, the rotor-stator interaction noise of the fan stage is also evaluated analytically based on computational fluid dynamic simulations. The implemented analytical boundary layer model provides the axial mean velocity profile and also the axial and transversal turbulent quantities. This allows to consider the turbulence within the boundary layer as anisotropic. The acoustic response of the rotor blades is predicted by using a modified theory for the acoustic radiation from an airfoil. The predicted tonal sound power levels are similar for the ingestion noise and the rotor-stator wake interaction noise at take-off conditions. For approach conditions the tonal boundary layer interaction noise is dominated by the rotor-stator wake interaction noise. The influence of the boundary layer thickness and the a shape factor, linked to the axial pressure gradient, on tonal noise is discussed. Concerning broadband noise the results indicate that the boundary layer interaction noise has the potential to dominate the low to mid frequency range compared to rotor-stator interaction noise. The predicted power spectral density levels show that the ingestion noise increases with boundary layer thickness and shape factor.

Item URL in elib:https://elib.dlr.de/128678/
Document Type:Conference or Workshop Item (Speech)
Title:Analytical prediction of boundary layer ingestion noise for an integrated turbofan
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Staggat, Martinmartin.staggat (at) dlr.deUNSPECIFIED
Moreau, Antoineantoine.moreau (at) dlr.deUNSPECIFIED
Guerin, SebastienSebastien.Guerin (at) dlr.deUNSPECIFIED
Date:7 July 2019
Journal or Publication Title:Proceedings of the 26th International Congress on Sound and Vibration, ICSV 2019
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
ISBN:978-199918100-0
Status:Published
Keywords:engine acoustics, boundary layer ingestion
Event Title:26th International Congress on Sound and Vibration (ICSV)
Event Location:Montréal, Kanada
Event Type:international Conference
Event Dates:07.-11. Jul. 2019
Organizer:International Institute of Acoustics and Vibration (IIAV)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation methods
Location: Berlin-Charlottenburg
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Staggat, Martin
Deposited On:05 Aug 2019 08:08
Last Modified:28 Oct 2019 12:23

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