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Aerodynamic Nonlinearities and Dynamic Stability in Transitional Airfoil Flows

Fehrs, Michael and Hennings, Holger (2022) Aerodynamic Nonlinearities and Dynamic Stability in Transitional Airfoil Flows. In: 19th International Forum on Aeroelasticity and Structural Dynamics, IFASD 2022. IFASD 2022, 13.-17. Jun. 2022, Madrid, Spanien. ISBN 978-840942353-8.

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This article presents an investigation on boundary layer transition induced aerodynamic nonlinearities, the dynamic stability of an airfoil in the vicinity of such nonlinearities, and the subsequent occurrence of limit cycle oscillations. To study such transitional nonlinear aerodynamics, the well-known experimental LCO case MP77 for the NLR7301 is considered. Although the LCO found for MP77 is not ascribed to boundary layer transition effects, it occurs in the vicinity of a strong nonlinearity in the moment curve that is most likely connected to shock-induced and transitional effects. A similar nonlinearity is created using a static model deformation. Steady results are then computed for the original and deformed airfoil with free and prescribed transition locations. For the target lift coefficient of the wind tunnel experiment, coupled unsteady CFD-CSM computations are performed. Although early results indicated an amplitude limiting effect in the vicinity of the aerodynamic nonlinearity, further investigations are not able to reproduce this behavior once the temporal discretization is improved. Based on this research, the working hypothesis that a transitional aerodynamic nonlinearity is providing the amplitude limiting effect for MP77 cannot be confirmed.

Item URL in elib:https://elib.dlr.de/187024/
Document Type:Conference or Workshop Item (Speech)
Title:Aerodynamic Nonlinearities and Dynamic Stability in Transitional Airfoil Flows
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Fehrs, MichaelUNSPECIFIEDhttps://orcid.org/0000-0002-8137-9758UNSPECIFIED
Date:June 2022
Journal or Publication Title:19th International Forum on Aeroelasticity and Structural Dynamics, IFASD 2022
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:boundary layer transition, limit cycle oscillations, transition modeling, transonic flow
Event Title:IFASD 2022
Event Location:Madrid, Spanien
Event Type:international Conference
Event Dates:13.-17. Jun. 2022
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Digital Technologies
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Simulation
Deposited By: Fehrs, Michael
Deposited On:29 Jun 2022 14:42
Last Modified:18 Aug 2023 11:50

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