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Coupled Mode Flutter of a Linear Compressor Cascade in Subsonic and Transonic Flow Conditions

Schuff, Matthias und Chenaux, Virginie (2020) Coupled Mode Flutter of a Linear Compressor Cascade in Subsonic and Transonic Flow Conditions. In: 18th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, ISROMAC 2020. ISROMAC 2020 - 18th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, 2020-11-23 - 2020-11-26, Online-Conference. doi: 10.1088/1742-6596/1909/1/012033. ISSN 1742-6588.

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Kurzfassung

Flutter onset in turbomachinery is typically investigated numerically via decoupled methods due to a high mass ratio of structure to air. The unsteady aerodynamic response of a forced motion vibration is evaluated for a positive or negative work entry. The forced motion simulations assume vacuum mode shape vibrations at certain amplitudes without modal coupling due to aerodynamic forces. This approach, also known as the energy method, is valid for a high blade mass ratio and small logarithmic decrement values. An aeroelastic study of a multi-passage linear compressor cascade was performed. In fluid-structure-coupled time-marching CFD, generic heave and pitch degrees of freedom are allowed to vibrate freely in reaction to any aerodynamic forces. For one subsonic and one transonic flow condition predicted to be stable by the classical energy method approach, aerodynamically coupled-mode flutter is observed. It is shown that variations in the starting conditions, i.e. the initial vibration and inter-blade phase angle of the system, can have a strong influence on the number of CFD iterations required until amplitudes grow. However, if coupled-mode flutter is present in the system, it will ultimately set in at a distinct inter-blade phase angle.

elib-URL des Eintrags:https://elib.dlr.de/137467/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Coupled Mode Flutter of a Linear Compressor Cascade in Subsonic and Transonic Flow Conditions
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Schuff, MatthiasMatthias.Schuff (at) dlr.dehttps://orcid.org/0000-0003-3276-2539NICHT SPEZIFIZIERT
Chenaux, VirginieVirginie.Chenaux (at) dlr.dehttps://orcid.org/0000-0002-9096-182XNICHT SPEZIFIZIERT
Datum:November 2020
Erschienen in:18th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, ISROMAC 2020
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Nein
DOI:10.1088/1742-6596/1909/1/012033
ISSN:1742-6588
Status:veröffentlicht
Stichwörter:turbomachinery, compressor, aeroelasticity, vibration, damping, flutter, coupled mode, mass ratio, lightweight
Veranstaltungstitel:ISROMAC 2020 - 18th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery
Veranstaltungsort:Online-Conference
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:23 November 2020
Veranstaltungsende:26 November 2020
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Antriebssysteme
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L ER - Engine Research
DLR - Teilgebiet (Projekt, Vorhaben):L - Virtuelles Triebwerk und Validierungsmethoden (alt)
Standort: Göttingen
Institute & Einrichtungen:Institut für Aeroelastik > Aeroelastische Experimente
Hinterlegt von: Schuff, Matthias
Hinterlegt am:24 Nov 2020 18:31
Letzte Änderung:24 Apr 2024 20:39

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