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Limit-Cycle Oscillations of a Supercritical Airfoil

van Rooij, A.C.L.M. and Nitzsche, Jens and Bijl, H. and Tichy, Lorenz (2013) Limit-Cycle Oscillations of a Supercritical Airfoil. International Forum on Aeroelasticity and Structural Dynamics, 24.-26. Juni 2013, Bristol, Großbritannien.

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Non-linear effects, either of structural or aerodynamic nature, are of high importance in aeroelasticity. These effects can cause limit-cycle oscillations (LCOs), which result in high loads on the oscillating structure. Possible sources of non-linearity in the flow are trailing-edge/shock-induced separation or shock dynamics. Investigations into these sources are limited due to the high computational costs of coupled fluid-structure simulations using Computational Fluid Dynamics (CFD). In this work LCOs are analysed using fluid-structure interaction (FSI) simulations and forced motion simulations of a two-degree-of-freedom airfoil system. The mean flow conditions from which LCOs might develop, are determined from the moment polar. The LCO analysis shows a slightly non-linear behaviour of the aerodynamic power. Furthermore, comparison of the coupled FSI simulations and the forced motion simulations shows that forced motion oscillations are useful for LCO modelling and amplitude estimation. For the five test cases investigated in this work it was found that the LCO amplitudes obtained using forced motion oscillations agrees fairly well with the LCO amplitude obtained from coupled FSI simulation. That is, if the complex mode shape of the LCO is used in the forced motion simulation. The power delivered by the lift is shown to be stongly influenced by the phase difference between pitch and plunge.

Item URL in elib:https://elib.dlr.de/83634/
Document Type:Conference or Workshop Item (Speech)
Title:Limit-Cycle Oscillations of a Supercritical Airfoil
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
van Rooij, A.C.L.M.UNSPECIFIEDhttps://orcid.org/0000-0001-8281-7441UNSPECIFIED
Nitzsche, JensUNSPECIFIEDhttps://orcid.org/0000-0002-2742-7368UNSPECIFIED
Bijl, H.Delft University of Technology, Faculty of Aerospace EngineeringUNSPECIFIEDUNSPECIFIED
Tichy, LorenzUNSPECIFIEDhttps://orcid.org/0000-0001-9092-5864UNSPECIFIED
Date:3 June 2013
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Limit-cycle oscillations, aerodynamic non-linearities, fluid-structure interaction
Event Title:International Forum on Aeroelasticity and Structural Dynamics
Event Location:Bristol, Großbritannien
Event Type:international Conference
Event Dates:24.-26. Juni 2013
Organizer:Royal Aeronautical Society
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 > Aeroelastic Simulations
Deposited By: van Rooij, Anouk
Deposited On:13 Aug 2013 17:12
Last Modified:29 Mar 2023 00:17

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