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Sensitivity analysis with respect to flutter-free design of compressor blades

May, Markus (2010) Sensitivity analysis with respect to flutter-free design of compressor blades. In: Proceedings "ASME Turbo Expo 2010". ASME Turbo Expo 2010 - Gas Turbine Technical Congress & Exposition, 14-18 June 2010, Glasgow, United Kingdom.

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Abstract

In this paper, the rotor geometries of two consecutive design loops are compared numerically with respect to aeroelastic stability. Therefore, the TRACE code of the German Aerospace Center DLR is used to compute the flutter predictions: based on a three-dimensional steady solution, the time-linearized Navier- Stokes equations are solved in order to assess the aerodynamic damping so that the critical inter-blade phase angles can be determined. Apart from the global stability behaviour the computation of local excitation per surface area is presented, facilitating the identification of stabilizing and destabilizing effects due to blade motion and flow field disturbances. Aiming for flutter-free design of compressor blades, an exemplary sensitivity analysis on the first mode is performed. Within the scope of this study, reduced frequency and mass ratio are varied and the influence of these parameters on the stability behaviour is deduced. For a tuned system, the nondimensional flutter equations are derived introducing the flutter index as aeroelastic similarity parameter. Differing tendencies of the aerodynamic work entry and the corresponding logarithmic decrement concerning flutter susceptibility are discussed in detail.

Item URL in elib:https://elib.dlr.de/65732/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Sensitivity analysis with respect to flutter-free design of compressor blades
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
May, MarkusUNSPECIFIEDUNSPECIFIED
Date:2010
Journal or Publication Title:Proceedings "ASME Turbo Expo 2010"
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:aeroelasticity, flutter, turbomachinery, compressor, rotor, CFD, time-linearized, sensitivity, reduced frequency, mass ratio
Event Title:ASME Turbo Expo 2010 - Gas Turbine Technical Congress & Exposition
Event Location:Glasgow, United Kingdom
Event Type:international Conference
Event Dates:14-18 June 2010
Organizer:International Gas Turbine Institute
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Fan and Compressor Technologies (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: Erdmann, Daniela
Deposited On:20 Oct 2010 08:12
Last Modified:20 Oct 2010 11:28

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