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Flutter Assessment of a Rotor Blade with Innovative Layout in Hover using Indicial Aerodynamics

Arnold, Jürgen (2016) Flutter Assessment of a Rotor Blade with Innovative Layout in Hover using Indicial Aerodynamics. AHS 72nd Annual Forum, 17.-19. Mai 2016, West Palm Beach, Florida, USA.

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Abstract

The double-swept ERATO blade layout is assessed for flutter stability in hover flight and compared to the straight 7AD reference blade. Used numerical methods comprise multibody dynamics together with an unsteady aerodynamic model based on Wagner’s function and related enhancements for the general motion of an airfoil section considering heave and pitch motion. The numerical solutions for flutter onset are gained from simulations in both, frequency and time domain. According flutter results are compared and observed aeroelastic couplings of the rotor blades are discussed. The two layouts exhibit the classical bending-torsion coupling as known for articulated rotor blades. An additional coupling is found with the ERATO blade. A dominant flutter mode develops with rotor harmonics of 3/rev for increasing rotor speed. The observed mechanism is composed of two flap bending modes that carry shares in blade twist as a result of the double-swept rotor blade shape.

Item URL in elib:https://elib.dlr.de/107583/
Document Type:Conference or Workshop Item (Speech)
Title:Flutter Assessment of a Rotor Blade with Innovative Layout in Hover using Indicial Aerodynamics
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Arnold, JürgenJuergen.Arnold (at) dlr.deUNSPECIFIED
Date:May 2016
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Rotorblatt, Aeroelastik, Flatterstabilität
Event Title:AHS 72nd Annual Forum
Event Location:West Palm Beach, Florida, USA
Event Type:international Conference
Event Dates:17.-19. Mai 2016
Organizer:American Helicopter Society International
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Virtual Aerodynamic Rotorcraft
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Simulations
Deposited By: Arnold, Dipl.-Ing. Jürgen
Deposited On:09 Dec 2016 09:05
Last Modified:09 Dec 2016 09:05

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