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A Numerical Study on Aerodynamic Resonance Phenomena in Transonic Airfoil Flow

Nitzsche, Jens and Brouwers, Kjell (2008) A Numerical Study on Aerodynamic Resonance Phenomena in Transonic Airfoil Flow. Deutscher Luft- und Raumfahrtkongress 2008, 2008-09-23 - 2008-09-25, Darmstadt, Deutschland (Europa).

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Abstract

We present preliminary results from an ongoing numerical investigation of unsteady shock/boundary layer interaction on a 2-d supercritical airfoil in transonic flow. Initially, DLR's time accurate flow solver TAU is used to demonstrate the ability of standard URANS methods to predict self-sustained periodic shock oscillations well known as shock buffet. Next, emphasis is put on the fixed-point stability of the steady flow field below the shock buffet onset. Therefore we perturb the flow in time with small harmonic deflections of the airfoil geometry and random noise impulses. With increasing angle of attack the steady flow is shown to develop a damped aerodynamic resonance, that degenerates finally towards self-amplification. The occurrence of the aerodynamic resonance is closely related to the development of shock-induced separation, accompanied by quasi-steady inverse shock motion.

Item URL in elib:https://elib.dlr.de/56118/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:A Numerical Study on Aerodynamic Resonance Phenomena in Transonic Airfoil Flow
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Nitzsche, JensUNSPECIFIEDUNSPECIFIED
Brouwers, KjellFaculty of Aerospace Engineering, Technical University of DelftUNSPECIFIED
Date:2008
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:shock buffet, aerodynamic resonance, stability, unsteady aerodynamics
Event Title:Deutscher Luft- und Raumfahrtkongress 2008
Event Location:Darmstadt, Deutschland (Europa)
Event Type:national Conference
Event Dates:2008-09-23 - 2008-09-25
Organizer:Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V. (DGLR)
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 - Flexible Aircraft (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: Erdmann, Daniela
Deposited On:14 Nov 2008
Last Modified:12 Dec 2013 20:34

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