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Time-Linearized Forced Response Analysis of a Counter Rotating Fan; Part II: Analysis of the DLR CRISP2 Model

Gómez Fernández, Io Eunice und Blocher, Michael (2014) Time-Linearized Forced Response Analysis of a Counter Rotating Fan; Part II: Analysis of the DLR CRISP2 Model. In: Proceedings of the ASME Turbo Expo. ASME Turbo Expo 2014, 16-20 Jun 2014, Düsseldorf, Germany. doi: 10.1115/GT2014-25838.

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Kurzfassung

Over the last 3 years, several Institutes of the German Aerospace Center (DLR) investigated the possible gains of a counter rotating fan arrangement manufactured from CFRP designed with an automated optimization tool chain. While counter rotating fans promise aerodynamic efficiency improvements, they might suffer from aerodynamic exitation phenomena as well. The wakes, potential fields and shocks on the blade suction sides might cause blade vibrations leading to high cycle fatigue. Therefore, numerical investigations into aerodynamic excitation are necessary to estimate the amplitude of induced vibrations. At the Institute of Aeroelasticity, a time-linearized loosely coupled approach was used to determine the aerodynamic forcing of the blade rows of this counter rotating fan arrangement. A finite element model consisting of shell elements was created for the blades in order to be able to model the CFRP material properties. Subsequently, nonlinear finite element load calculations (inertia and blade surface pressure) with a modal analysis in the last step were performed to generate a Campbell diagram of the rotor blades. Critical operating points were identified from the Campbell diagram. Nonlinear steady CFD simulations of these operating points were performed. Based on these calculations, time-linearized unsteady simulations at the crititcal inter-blade phase angle were performed with forced blade motion to determine the aerodynamic damping. Similarly, time-linearized unsteady simulations were performed with gust boundary conditions to determine the aerodynamic forcing. The results of aerodynamic damping and aerodynamic forcing simulations were combined to yield the predicted forced response amplitude of the eigenmode shape that is going to be excited at the respective critical operating point. As a last step, a nonlinear finite element displacement simulation is conducted to determine the static and dynamic stresses and strains during a forced response vibration. These static and dynamic stresses and strains are then compared to the material properties of the CFRP material to determine if the blades will keep their structural integrity over time. The results of these calculations are presented and discussed.

elib-URL des Eintrags:https://elib.dlr.de/91079/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Time-Linearized Forced Response Analysis of a Counter Rotating Fan; Part II: Analysis of the DLR CRISP2 Model
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Gómez Fernández, Io EuniceAE-EXTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Blocher, Michaelmichael.blocher (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:Juni 2014
Erschienen in:Proceedings of the ASME Turbo Expo
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Nein
DOI:10.1115/GT2014-25838
Status:veröffentlicht
Stichwörter:aeroelasticity, forced response, turbomachines, time-linear, energy method
Veranstaltungstitel:ASME Turbo Expo 2014
Veranstaltungsort:Düsseldorf, Germany
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:16-20 Jun 2014
Veranstalter :ASME IGTI
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 - Verdichtertechnologien (alt)
Standort: Göttingen
Institute & Einrichtungen:Institut für Aeroelastik
Hinterlegt von: Blocher, Michael
Hinterlegt am:29 Okt 2014 11:04
Letzte Änderung:21 Jul 2023 08:27

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