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Spanwise Differences in Static and Dynamic Stall on a Pitching Rotor Blade Tip Model

Merz, Christoph B. and Wolf, Christian C. and Richter, Kai and Kaufmann, Kurt and Mielke, Alina and Raffel, Markus (2015) Spanwise Differences in Static and Dynamic Stall on a Pitching Rotor Blade Tip Model. European Rotorcraft Forum 2015, 01. – 04. September 2015, Munich, Germany.

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Official URL: http://www.erf2015.dglr.de/


An experimental investigation of static and dynamic stall on a rotor blade tip model with a parabolic tip geometry and aspect ratio 6.2 at a chord Reynolds number of 900,000 and a Mach number of 0.16 is presented. The resulting flow is analyzed based on unsteady surface pressure measurements and quantitative flow visualizations by high-speed particle image velocimetry. The flow separation is found to be delayed near the parabolic blade tip for static angles of attack as well as for sinusoidal angle of attack motions. The maximum effective angle of attack prior to stall is shifted to approximately two-thirds of the span outboard from the root because of a positive twist of the model with an increasing geometric angle of attack towards the tip. The stall onset is observed near the section with the maximum effective angle of attack, with a subsequent spanwise spreading of the flow separation. Different stages of flow separation for static angles of attack are identified one of them with the occurrence of two stall cells. During dynamic stall, the leading edge vortex formation starts near the maximum effective angle of attack and the pitching moment peak resulting from the passage of the dynamic stall vortex is higher at this section. Further inboard the maximum aerodynamic loads are of comparable magnitude whereas the outboard section shows reduced peaks due to the influence of the wing tip vortex.

Item URL in elib:https://elib.dlr.de/95326/
Document Type:Conference or Workshop Item (Speech)
Additional Information:ERF2015_0077
Title:Spanwise Differences in Static and Dynamic Stall on a Pitching Rotor Blade Tip Model
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Merz, Christoph B.christoph.merz (at) dlr.deUNSPECIFIED
Wolf, Christian C.christian.wolf (at) dlr.deUNSPECIFIED
Richter, Kaikai.richter (at) dlr.deUNSPECIFIED
Kaufmann, Kurtkurt.kaufmann (at) dlr.deUNSPECIFIED
Raffel, Markusmarkus.raffel (at) dlr.deUNSPECIFIED
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-14
Series Name:Conference Proceedings online
Keywords:Pitching Rotor Blade, Dynamic Stall
Event Title:European Rotorcraft Forum 2015
Event Location:Munich, Germany
Event Type:international Conference
Event Dates:01. – 04. September 2015
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 (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Institute of Aerodynamics and Flow Technology > High Speed Configurations
Deposited By: Micknaus, Ilka
Deposited On:05 Oct 2015 14:48
Last Modified:05 Oct 2015 14:48

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