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Aeroelastic behavior of a rotating semi-elastic double-swept rotor blade under climb conditions at the Rotor Test Facility Gottingen

Müller, Martin Michael and Weiss, Armin and Braukmann, Johannes N. and Wolf, Christian (2023) Aeroelastic behavior of a rotating semi-elastic double-swept rotor blade under climb conditions at the Rotor Test Facility Gottingen. 79th Annual Forum Vertical Flight Society, 2023-05-16 - 2023-05-18, West Palm Beach, Florida.

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Abstract

The study presents the aeroelastic behavior of a double-swept rotor blade, that was investigated under climb conditions on a four-bladed rotor in the rotor test facility at the German Aerospace Center in Gottingen. The results of two ¨ measurement campaigns are combined to obtain a detailed insight in the coupling of blade deformation, integral loads, aerodynamic behavior and blade tip vortex. Especially the interaction between stall onset and blade tip vortex is in focus of the investigation. The first measurement campaign considered the underlying aerodynamics, integral blade loads and blade deformation by means of unsteady pressure-sensitive paint (iPSP), strain gauges at the blade root and blade tip marker. The blade tip vortex behavior was characterized in a second measurement campaign with particle image velocimetry (PIV). Different pitch settings were investigated at a rotation frequency of f rot = 23.6 Hz, that corresponds to blade tip Mach and Reynolds numbers of Mtip = 0.282 - 0.285 and Retip = 5.84 - 5.95 x 105. The results reveal a detailed insight into a two-step stall behavior and its impact on blade flapping and torsion. The iPSP and PIV data indicates an interaction between stall onset at the blade tip and a simultaneous inward motion of the blade tip vortex caused by the backward-swept part of the blade.

Item URL in elib:https://elib.dlr.de/196395/
Document Type:Conference or Workshop Item (Speech)
Title:Aeroelastic behavior of a rotating semi-elastic double-swept rotor blade under climb conditions at the Rotor Test Facility Gottingen
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Müller, Martin MichaelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Weiss, ArminUNSPECIFIEDhttps://orcid.org/0000-0002-7532-2974UNSPECIFIED
Braukmann, Johannes N.UNSPECIFIEDhttps://orcid.org/0000-0001-8046-9623UNSPECIFIED
Wolf, ChristianUNSPECIFIEDhttps://orcid.org/0000-0002-9052-7548UNSPECIFIED
Date:18 May 2023
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Rotorblade, Double-swept, Aeroelasticity
Event Title:79th Annual Forum Vertical Flight Society
Event Location:West Palm Beach, Florida
Event Type:international Conference
Event Start Date:16 May 2023
Event End Date:18 May 2023
Organizer: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 , Köln-Porz
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Experiments
Institute for Aerodynamics and Flow Technology > Helicopter, GO
Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Müller, Martin Michael
Deposited On:09 Aug 2023 12:34
Last Modified:24 Apr 2024 20:56

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