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Acoustic Feedback and Its Impact on Fan Flutter in Short Aeroengine Intakes

Schnell, Rainer and Frey, Christian (2022) Acoustic Feedback and Its Impact on Fan Flutter in Short Aeroengine Intakes. Journal of Propulsion and Power. American Institute of Aeronautics and Astronautics (AIAA). doi: 10.2514/1.B38567. ISSN 0748-4658.

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Official URL: https://arc.aiaa.org/doi/10.2514/1.B38567


The authors have investigated pressure waves being emitted by the structural motion of a rotor blade and their impact on fan flutter sensitivity. This impact results from an acoustic feedback loop caused by reflection phenomena at the intake lip and may lead to a specific form of aeroelastic instability. Harmonic balance simulations of the fan/intake system over a wide operating range and blade eigenfrequencies were carried out. A significant impact on the rotor aerodynamic damping was observed as compared with the isolated rotor analysis due to the presence of the intake. This influence was either stabilizing or destabilizing, depending mainly on the phase relation between the emitted and reflected unsteady pressure fields. Computational fluid dynamics (CFD) data were analyzed accordingly, taking advantage of two-dimensional wave split as well as three-dimensional induct modal decomposition techniques. By deriving a simple analytical model based on eigenvalue analysis, a landscape showing regions of aerodynamic damping and excitation could be drawn over the investigated frequency–mass flow range. This analytical model and its verification with CFD data can help in identifying destabilizing areas at an early design stage, and hence support design decisions regarding flutter stability or give indications where analysis with higher fidelity is required.

Item URL in elib:https://elib.dlr.de/186815/
Document Type:Article
Title:Acoustic Feedback and Its Impact on Fan Flutter in Short Aeroengine Intakes
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Frey, ChristianUNSPECIFIEDhttps://orcid.org/0000-0003-0496-9225UNSPECIFIED
Date:May 2022
Journal or Publication Title:Journal of Propulsion and Power
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
Keywords:Propulsion Integration, Fan Flutter, Intake Coupling
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Clean Propulsion
DLR - Research area:Aeronautics
DLR - Program:L CP - Clean Propulsion
DLR - Research theme (Project):L - Future Engines and Engine Integration
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Fan and Compressor
Institute of Propulsion Technology > Numerical Methodes
Deposited By: Schnell, Dr.-Ing. Rainer
Deposited On:13 Jun 2022 11:15
Last Modified:19 Oct 2023 13:23

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