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Reliability of Time-Linearized Flutter Predictions Near the Surge Line

May, Markus and Grüber, Björn (2011) Reliability of Time-Linearized Flutter Predictions Near the Surge Line. In: Proceedings "ETC 9". ETC 9 - The 9th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics, 21 - 25 March 2011, Istanbul, Turkey.



In the context of the flutter analysis of a modern transonic axial compressor two different CFD codes have been compared: based on the same three-dimensional steady solution, the timelinearized Navier-Stokes flow solver TRACE of the German Aerospace Center DLR as well as the industrial time-linearized Euler code Lin3D (developed at MTU Aero Engines) were used to assess the global aerodynamic damping of the rotor. No major differences could be observed for operating points on the working line. However, several operating points (at different shaft speeds) near the surge line were susceptible to flutter according to TRACE whereas Lin3D predicted aeroelastic stability. The capturing of shock movements as well as the modeling of the tip gap is identified to be responsible for these discrepancies. In this paper the sources of the different local excitation and damping mechanisms are highlighted. Moreover influence coefficient representations for the different approaches are compared in the complex plane.

Item URL in elib:https://elib.dlr.de/70215/
Document Type:Conference or Workshop Item (Speech)
Title:Reliability of Time-Linearized Flutter Predictions Near the Surge Line
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Grüber, BjörnMTU Aero Engines GmbHUNSPECIFIED
Journal or Publication Title:Proceedings "ETC 9"
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:aeroelasticity, turbomachinery, flutter, compressor, influence coefficients
Event Title:ETC 9 - The 9th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics
Event Location:Istanbul, Turkey
Event Type:international Conference
Event Dates:21 - 25 March 2011
Organizer:European Turbomachinery Committee
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignment
DLR - Research theme (Project):L - no assignment (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: Erdmann, Daniela
Deposited On:10 Nov 2011 08:48
Last Modified:31 Jul 2019 19:32

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