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Coupled Mode Flutter Analysis of Turbomachinery Blades using an Adaptation of the P-K Method

Schuff, Matthias and Chenaux, Virginie (2020) Coupled Mode Flutter Analysis of Turbomachinery Blades using an Adaptation of the P-K Method. In: Proceedings of ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. ASME Turbo Expo 2020, 21.-25. Sep. 2020, Virtual Event. doi: 10.1115/GT2020-14105.

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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. A two-dimensional 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/136139/
Document Type:Conference or Workshop Item (Speech)
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:September 2020
Journal or Publication Title:Proceedings of ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.1115/GT2020-14105
Status:Published
Keywords:turbomachinery, compressor, aeroelasticity, vibration, damping, flutter, coupled mode, mass ratio, lightweight
Event Title:ASME Turbo Expo 2020
Event Location:Virtual Event
Event Type:international Conference
Event Dates:21.-25. Sep. 2020
Organizer:The American Society of Mechanical Engineers (ASME)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Experiments
Deposited By: Schuff, Matthias
Deposited On:12 Oct 2020 16:06
Last Modified:12 Oct 2020 16:06

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