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Lifting-Surface Limit-Cycle Oscillations due to Transonic Flow

Dietz, Guido (2007) Lifting-Surface Limit-Cycle Oscillations due to Transonic Flow. Goldstein Lecture 2007, 14.11.2007, Manchester, UK (Europe).

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Kurzfassung

Results from flutter and forced-oscillation wind-tunnel experiments at flow conditions close to the transonic dip are presented. Flutter boundaries exhibiting a transonic dip were determined and limit-cycle oscillations (LCOs) were measured. The local energy exchange between the fluid and the structure during LCOs is examined and leads to the following findings: at supercritical Mach numbers below that of the transonic-dip minimum the presence of a shock-wave and its dynamics destabilizes the aeroelastic system such that the decreasing branch of the transonic dip develops. At higher Mach numbers the shock-wave motion has a stabilizing effect such that the flutter boundary increases to higher flutter-speed indices with increasing Mach number. Amplified oscillations near this branch of the flutter boundary obtain energy from the flow mainly due to the dynamics of a trailing-edge flow separation. A slight nonlinear amplitude dependency of the shock motion and a possibly occurring boundary-layer separation cause the amplitude limitation of the observed LCOs. The impact of the experimental findings at Reynolds-numbers of about 1.5 Mio. on the numerical simulation of these phenomena, and on future research at flight-relevant Reynolds-numbers is discussed.

elib-URL des Eintrags:https://elib.dlr.de/51913/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Lifting-Surface Limit-Cycle Oscillations due to Transonic Flow
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Dietz, GuidoNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2007
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:limit-cycle oscillation, transonic dip, flutter, supercritical airfoil
Veranstaltungstitel:Goldstein Lecture 2007
Veranstaltungsort:Manchester, UK (Europe)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:14.11.2007
Veranstalter :Royal Aeronautical Society Manchester Branch / University of Manchester
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler (alt)
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Flexibles Flugzeug (alt)
Standort: Göttingen
Institute & Einrichtungen:Institut für Aeroelastik
Hinterlegt von: Erdmann, Daniela
Hinterlegt am:20 Nov 2007
Letzte Änderung:27 Apr 2009 14:29

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