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Prediction of transonic flutter behavior of a supercritical airfoil using reduced order methods

Banavara, Nagaraj and Dimitrov, Diliana (2012) Prediction of transonic flutter behavior of a supercritical airfoil using reduced order methods. 18. DGLR-Fach-Symposium der STAB, 06.-07. Nov. 2012, Stuttgart, Deutschland.

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Abstract

The flutter behavior of a supercritical airfoil is investigated using a panel formulation, which solves the subsonic unsteady linearized small-disturbance integral equations. Linear aerodynamic theories provide good predictions for attached moderately subsonic and supersonic flows but break down in the transonic flow conditions due to the nonlinearities inherent in unsteady transonic flow. These nonlinearities dominate the transonic flutter behavior typically resulting in the so-called transonic dip. Time-domain aeroelastic simulations involving Computational Fluid Dynamics (CFD) are computationally very expensive and are not favored when a large number of simulations are required. It is a common practice to correct the unsteady aerodynamics calculated from linear formulations to account for the flow nonlinearities associated with unsteady transonic flows. A Reduced Order Method (ROM) is presented yielding to complex-valued aerodynamic corrections for vibration modes. This ROM is used in linear frequency-domain flutter analyses.

Item URL in elib:https://elib.dlr.de/79941/
Document Type:Conference or Workshop Item (Speech)
Title:Prediction of transonic flutter behavior of a supercritical airfoil using reduced order methods
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Banavara, Nagarajnagaraj.banavara (at) dlr.deUNSPECIFIED
Dimitrov, Dilianadiliana.dimitrov (at) dlr.deUNSPECIFIED
Date:2012
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Accepted
Keywords:flutter, transonic flow, reduced order method
Event Title:18. DGLR-Fach-Symposium der STAB
Event Location:Stuttgart, Deutschland
Event Type:national Conference
Event Dates:06.-07. Nov. 2012
Organizer:AG STAB
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation & Validation (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: Erdmann, Daniela
Deposited On:16 May 2013 10:07
Last Modified:16 May 2013 10:07

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