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Coupled Mode Flutter Analysis of Turbomachinery Blades Using an Adaptation of the p-k Method

Schuff, Matthias and Chenaux, Virginie (2021) Coupled Mode Flutter Analysis of Turbomachinery Blades Using an Adaptation of the p-k Method. Journal of Engineering for Gas Turbines and Power, 143 (2), 021017. American Society of Mechanical Engineers (ASME). doi: 10.1115/1.4048986. ISSN 0742-4795.

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Abstract

Current trends in turbomachinery design significantly reduce the mass ratio of structure to air, making them prone to flutter by aerodynamic coupling between mode shapes, also called coupled-mode flutter. The p-k method, which solves an aeroelastic eigenvalue problem for frequency and damping, respectively, excitation of the aerodynamically coupled system, was adapted for turbomachinery application using aerodynamic responses computed in the frequency domain (FD). A two-dimensional (2D) test case is validated against time-marching fluid-structure coupled simulations for subsonic and transonic conditions. A span of mass ratios is investigated showing that the adapted p-k method is able to predict the transition between aeroelastically stable and unstable cascades depending on the mass ratio. Finally, the p-k method is applied to a low mass ratio fan showing that the flutter-free operating range is significantly reduced when aerodynamic coupling effects are taken into account.

Item URL in elib:https://elib.dlr.de/140714/
Document Type:Article
Title:Coupled Mode Flutter Analysis of Turbomachinery Blades Using an Adaptation of the p-k Method
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Schuff, MatthiasMatthias.Schuff (at) dlr.dehttps://orcid.org/0000-0003-3276-2539
Chenaux, VirginieVirginie.Chenaux (at) dlr.deUNSPECIFIED
Date:February 2021
Journal or Publication Title:Journal of Engineering for Gas Turbines and Power
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:143
DOI :10.1115/1.4048986
Page Range:021017
Publisher:American Society of Mechanical Engineers (ASME)
ISSN:0742-4795
Status:Published
Keywords:turbomachinery, flutter, coupled mode, aerodynamic coupling, mass ratio, lightweight, fan
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 - Fan and Compressor Technologies (old), L - Flight Physics (old), L - Virtual Engine and Validation methods (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Institute of Aeroelasticity > Aeroelastic Experiments
Deposited By: Schuff, Matthias
Deposited On:01 Feb 2021 11:31
Last Modified:01 Feb 2021 11:31

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