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Flutter Assessment of a Double-Swept Rotor Blade in Hover Based on Indicial Aerodynamics Considering Blade Profile, Rotor Inflow and Wake Periodicity

Arnold, Jürgen (2022) Flutter Assessment of a Double-Swept Rotor Blade in Hover Based on Indicial Aerodynamics Considering Blade Profile, Rotor Inflow and Wake Periodicity. VFS Aeromechanics for Advanced Vertical Flight Technical Meeting, 25.-27. Jan. 2022, San Jose, USA.

Full text not available from this repository.

Abstract

The ERATO rotor blade is assessed for flutter stability in hover. For the aeroelastic analyses, the multibody model is tightly-coupled 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. The mathematical setup of the Wagner function is extended for axial flow to include unsteady contributions related to rotor inflow and wake periodicity. Since the unsteady aerodynamic model is based on indicial functions, a separation of these contributions is possible and allows to study their individual impact on rotor blade flutter. According flutter results are extracted in frequency domain for three test cases which differ in the unsteady aerodynamic model for circulation comprising blade profile, rotor inflow and wake periodicity. In addition to the classical bending-torsion coupling which is well known for articulated straight rotor blades, the double-swept ERATO blade exhibits a critical flutter coupling which is composed of two elastic flap bending modes. Due to the forward and backward sweep of the blade layout, these elastic flap modes introduce further torsional blade motion into the aeroelastic coupling.

Item URL in elib:https://elib.dlr.de/188271/
Document Type:Conference or Workshop Item (Speech)
Title:Flutter Assessment of a Double-Swept Rotor Blade in Hover Based on Indicial Aerodynamics Considering Blade Profile, Rotor Inflow and Wake Periodicity
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Arnold, JürgenUNSPECIFIEDhttps://orcid.org/0000-0002-1751-7458UNSPECIFIED
Date:January 2022
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Aeroelastik, Flatterstabilität, ERATO Rotorblatt
Event Title:VFS Aeromechanics for Advanced Vertical Flight Technical Meeting
Event Location:San Jose, USA
Event Type:international Conference
Event Dates:25.-27. Jan. 2022
Organizer:VFS - Vertical Flight Society
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Virtual Rotorcraft and Validation
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Simulation
Deposited By: Arnold, Dipl.-Ing. Jürgen
Deposited On:19 Sep 2022 14:57
Last Modified:19 Sep 2022 14:57

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