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Development of an innovative double-swept rotor blade tip for the rotor test facility Goettingen

Müller, Martin Michael and Schwermer, Till and Mai, Holger and Stieg, Christian (2018) Development of an innovative double-swept rotor blade tip for the rotor test facility Goettingen. DLRK 2018 - Deutscher Luft- und Raumfahrtkongress, 04.-06. Sep. 2018, Friedrichshafen.

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Abstract

Innovative double-swept rotor blade tip planforms show significant potential to reduce noise and vibrations while improving the overall performance. Current test results for a non-rotating double-swept innovative rotor blade tip model, inspired by the DLR patent Erato, were obtained in a conventional wind tunnel (DNW TWG, Transonic Wind Tunnel Goettingen) under forced pitching motions. In the next step, the influence of rotation and the environment of an entire rotor head system should be considered. It is of great interest to investigate the influence of rotation on the aeroelastic behaviour and the unsteady aerodynamics in a dedicated further experiment. The Rotor Test Facility Goettingen (RTG) was built for research on rotating rotor blades under optimized boundary conditions and will be used for the planned experiments. Typical flow phenomena associated with rotor blades will be investigated, such dynamic stall, compression shocks as well as aeroelastic stability. For that purpose new innovative double-swept rotor blades for the RTG have been developed at the DLR Institute of Aeroelasticity in Goettingen. The design of the planform is partially based on the existing wind tunnel model. Further profile sections and a rotor head attachment were added. Design load cases were determined from two dimensional numerical flow simulations regarding several rotor blade sections. A finite element analysis, including fatigue analysis, was carried out as well. In order to extract the dominant flow phenomena the rotor blades are instrumented with unsteady pressure transducers, temperature transmitters and strain gauges. The acquired data will enable subsequent evaluation concerning aeroelastic stability of the entire rotor head system and the rotor blade tip geometry. Furthermore the influence of rotation on the dynamic stall phenomenon can be assessed.

Item URL in elib:https://elib.dlr.de/122702/
Document Type:Conference or Workshop Item (Speech)
Title:Development of an innovative double-swept rotor blade tip for the rotor test facility Goettingen
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Müller, Martin MichaelM-MMueller (at) dlr.deUNSPECIFIED
Schwermer, TillTill.Schwermer (at) dlr.deUNSPECIFIED
Mai, HolgerHolger.Mai (at) dlr.deUNSPECIFIED
Stieg, ChristianChristian.stieg (at) dlr.deUNSPECIFIED
Date:5 September 2018
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:helicopter, rotorblade, innovative planform
Event Title:DLRK 2018 - Deutscher Luft- und Raumfahrtkongress
Event Location:Friedrichshafen
Event Type:international Conference
Event Dates:04.-06. Sep. 2018
Organizer:DGLR - Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V.
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 Quiet und Comfortable Rotorcraft, L - The Innovative Rotorcraft
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Experiments
Institute for Aerodynamics and Flow Technology > Helicopter, GO
Deposited By: Müller, Martin Michael
Deposited On:21 Nov 2018 11:00
Last Modified:31 Jul 2019 20:20

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