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Energy budget analysis of aeroelastic limit-cycle oscillations

van Rooij, A.C.L.M. and Nitzsche, J. and Dwight, R.P. (2017) Energy budget analysis of aeroelastic limit-cycle oscillations. Journal of Fluids and Structures, 69, pp. 174-186. Elsevier. DOI: 10.1016/j.jfluidstructs.2016.11.016 ISSN 0889-9746

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Official URL: http://dx.doi.org/10.1016/j.jfluidstructs.2016.11.016

Abstract

In this work limit-cycle oscillations (LCOs) caused by aerodynamic non-linearitieswere analysed using fluid-structure interaction (FSI) simulations of a two-degree-of-freedomairfoil system. A comparison with sinusoidal forced motion oscillation simulations at the fundamental frequency was performed. The results show that using the first harmonic component for the forced motion oscillations is a good approach to describe the limit-cycle oscillations considered in this work. Following the work of G. Dietz, G. Schewe and H. Mai (2004), Journal of Fluids and Structures, Vol. 19, an energy budget analysis of the limit-cycle oscillations was performed. Power analysis of the LCO reveals that the power of the lift and moment show non-linear behaviour with increasing amplitude. The linearised equivalent power components that would occur in case of flutter were computed. These show that the defect in the power of the lift in the non-linear case is caused by the increase of the phase of the lift with oscillation amplitude, which is the result of the unsteady shock wave motions on both upper and lower surface of the airfoil. The power of the moment also shows a defect, which is much smaller than in case of the lift. This defect is caused by variations in both the magnitude and the phase of the moment with oscillation amplitude.

Item URL in elib:https://elib.dlr.de/108309/
Document Type:Article
Title:Energy budget analysis of aeroelastic limit-cycle oscillations
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
van Rooij, A.C.L.M.anouk.vanrooij (at) dlr.deUNSPECIFIED
Nitzsche, J.jens.nitzsche (at) dlr.deUNSPECIFIED
Dwight, R.P.delft university of technology, faculty of aerospace engineeringUNSPECIFIED
Date:4 January 2017
Journal or Publication Title:Journal of Fluids and Structures
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:69
DOI :10.1016/j.jfluidstructs.2016.11.016
Page Range:pp. 174-186
Publisher:Elsevier
ISSN:0889-9746
Status:Published
Keywords:limit-cycle oscillations, aerodynamic non-linearities, fluid-structure interaction, complex mode shape, power analysis
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 - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Simulations
Deposited By: van Rooij, Anouk
Deposited On:13 Jan 2017 08:59
Last Modified:31 Jul 2019 20:05

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