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Comparison of Linear and Nonlinear Frequency Domain Methods for Flutter Analysis

Kersken, Hans-Peter and Ashcroft, Graham and Frey, Christian and Wolfrum, Nina and Pütz, Oliver (2018) Comparison of Linear and Nonlinear Frequency Domain Methods for Flutter Analysis. In: Proceedings of the ASME Turbo Expo. ASME Turbo Expo 2018, 11-16 Jun 2018, Oslo, Norway.

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Both linear and nonlinear frequency domain methods have been applied successfully to the investigation of time-periodic phenomena in turbomachinery. Linear methods allow to perform flutter analysis of turbomachinery blade rows very efficiently. Nonlinear frequency domain method can be applied to flutter analysis as well. If a pseudo-time solution algorithm is employed as a solver the nonlinear frequency domain method takes advan- tage of the stabilizing effect of the nonlinear coupling of the har- monics. Additionally, it allows studying the influence of nonlin- ear effects on the flutter stability. A linear GMRes based method and a harmonic balance method using a pseudo-time solution approach are compared with respect to computational efficiency when applied to the flutter analysis of blades of a stationary gas turbine and a low pressure turbine of a jet engine. It is shown that both methods have their merits and limitation depending on the type of problem at hand.

Item URL in elib:https://elib.dlr.de/120509/
Document Type:Conference or Workshop Item (Speech)
Title:Comparison of Linear and Nonlinear Frequency Domain Methods for Flutter Analysis
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Kersken, Hans-PeterHans-Peter.Kersken (at) dlr.dehttps://orcid.org/0000-0003-4203-6450
Ashcroft, Grahamgraham.ashcroft (at) dlr.deUNSPECIFIED
Frey, ChristianChristian.Frey (at) dlr.deUNSPECIFIED
Wolfrum, NinaMTU Aero Engines GmbHUNSPECIFIED
Pütz, Oliverpuetz.oliver (at) siemens.comUNSPECIFIED
Date:11 June 2018
Journal or Publication Title:Proceedings of the ASME Turbo Expo
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Flutter, Hamronic Balance, nonlinear frequency domain method, time-linearized
Event Title:ASME Turbo Expo 2018
Event Location:Oslo, Norway
Event Type:international Conference
Event Dates:11-16 Jun 2018
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 - Turbine Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Numerical Methodes
Deposited By: Kersken, Dr.rer.nat. Hans-Peter
Deposited On:21 Jun 2018 09:49
Last Modified:27 Jun 2018 11:23

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