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Experimental Investigation of Unsteady Transition on a Pitching Rotor Blade Airfoil

Richter, Kai and Koch, Stefan and Gardner, Anthony Donald and Mai, Holger and Klein, Alexander and Rohardt, Claas-Hinrik (2014) Experimental Investigation of Unsteady Transition on a Pitching Rotor Blade Airfoil. Journal of the American Helicopter Society, 59 (01), pp. 1-12. American Helicopter Society. doi: 10.4050/JAHS.59.012001. ISSN 0002-8711.

Full text not available from this repository.

Official URL: http://dx.doi.org/10.4050/JAHS.59.012001


The unsteady flow around the pitching helicopter main rotor blade airfoil EDI-M109 was experimentally investigated at conditions similar to those existing on a retreating rotor blade in forward flight. High speed pressure measurements and hot film anemometry were used to investigate the unsteady transition characteristics of the airfoil. Results are presented for dynamic test points with attached flow, light dynamic stall and deep dynamic stall at M = 0.3 and Re = 1.8 x 10^6. The results include the discussion of the periodicity of the hot film signals for different flow states. The transition process of the pitching airfoil is analyzed and the significance of the intermittent region is described. A time delay between the transition and the model motion is discussed and a linear relationship between the transition position and the time is observed. The influences of the pitching amplitude on the transition characteristics are discussed and the flow separation initiating dynamic stall is analyzed.

Item URL in elib:https://elib.dlr.de/80712/
Document Type:Article
Additional Information:Online available: 26. November 2013, January 2014, Nr. 012001
Title:Experimental Investigation of Unsteady Transition on a Pitching Rotor Blade Airfoil
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Richter, Kaikai.richter (at) dlr.deUNSPECIFIED
Koch, Stefanstefan.koch (at) dlr.deUNSPECIFIED
Gardner, Anthony Donaldtony.gardner (at) dlr.deUNSPECIFIED
Mai, Holgerholger.mai (at) dlr.deUNSPECIFIED
Klein, AlexanderUniversität StuttgartUNSPECIFIED
Rohardt, Claas-Hinrikclaas-hinrik.rohardt (at) dlr.deUNSPECIFIED
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.59.012001
Page Range:pp. 1-12
Publisher:American Helicopter Society
Keywords:helicopter rotor blade airfoil, EDI-M109, dynamic stall, unsteady boundary layer transition, hot film anemometry, intermittency, laminar, turbulent
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: Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > High Speed Configurations
Institute of Aerodynamics and Flow Technology > Helicopters
Institute of Aerodynamics and Flow Technology > Transport Aircraft
Institute of Aeroelasticity > Aeroelastic Experiments
Deposited By: Richter, Kai
Deposited On:07 Jan 2014 11:22
Last Modified:08 Mar 2018 18:45

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