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

Merz, Christoph B. and Wolf, Christian and Richter, Kai and Kaufmann, Kurt and Mielke, Alina and Raffel, Markus (2017) Spanwise Differences in Static and Dynamic Stall on a Pitching Rotor Blade Tip Model. Journal of the American Helicopter Society, 62 (1), pp. 1-11. American Helicopter Society. doi: 10.4050/JAHS.62.012002. ISSN 0002-8711.

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Official URL: https://doi.org/10.4050/JAHS.62.012002


An experimental investigation of static and dynamic stall on a rotor blade tip model with an aspect ratio of 6.2 at a chord Reynolcls number of900 ,000 and a Mach numbcr of0.16 is presented. The spatiotemporal behavior of the flow separation was analyzed using unstcady surface pressurc measurements ancl high-speecl particle image velocimetry. The maximum effective angle of attack prior to stall is shiftecl to approximately two-thirds of the span outboard because of an increasing geometric angle of attack of the model towarcl the tip. Different stages of flow separation for static angles of attack were identified, inclucling the occurrence of two stall cells. Du ring dynamic stall, the leacling edge vortcx formation starts near the spanwise position of thc static stall onset. The subsequent spanwise evolution of the vortex formation results in two vorticcs for deep stall conclitions, covering the samc spanwisc arcas as thc two static stall cclls.

Item URL in elib:https://elib.dlr.de/116259/
Document Type:Article
Additional Information:http://www.ingentaconnect.com/content/ahs/jahs
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, ChristianChristian.Wolf (at) dlr.dehttps://orcid.org/0000-0002-9052-7548
Richter, KaiKai.Richter (at) dlr.deUNSPECIFIED
Kaufmann, KurtKurt.Kaufmann (at) dlr.dehttps://orcid.org/0000-0003-2276-3386
Raffel, MarkusMarkus.Raffel (at) dlr.dehttps://orcid.org/0000-0002-3340-9115
Date:January 2017
Journal or Publication Title:Journal of the American Helicopter Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.4050/JAHS.62.012002
Page Range:pp. 1-11
EditorsEmailEditor's ORCID iD
Publisher:American Helicopter Society
Keywords:Dynamic Stall, Particle Image Velocimetry, Wind Tunnel Testing
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 for Aerodynamics and Flow Technology > Helicopter, GO
Institute for Aerodynamics and Flow Technology > High Speed Configurations, GO
Deposited By: Bachmann, Barbara
Deposited On:07 Dec 2017 15:35
Last Modified:05 Nov 2020 17:39

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