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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 (2012) Experimental Investigation of Unsteady Transition on a Pitching Rotor Blade Airfoil. 38th European Rotorcraft Forum, 04. - 07. Sept. 2012, Amsterdam, Niederlande.

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Official URL: http://erf2012.nlr.nl/index.html


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 analysed 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 analysed.

Item URL in elib:https://elib.dlr.de/76889/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Experimental Investigation of Unsteady Transition on a Pitching Rotor Blade Airfoil
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Klein, AlexanderUniversität StuttgartUNSPECIFIED
Date:5 September 2012
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-13
Series Name:Conference Proceedings on USB-Stick
Keywords:helicopter rotor blade airfoil, EDI-M109, dynamic stall, unsteady boundary layer transition, hot film anemometry, intermittency, laminar, turbulent
Event Title:38th European Rotorcraft Forum
Event Location:Amsterdam, Niederlande
Event Type:international Conference
Event Dates:04. - 07. Sept. 2012
Organizer:Netherlands Association of Aeronautical Engineers (NVvL)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft (old)
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 > Transport Aircraft
Institute of Aerodynamics and Flow Technology > Helicopters
Institute of Aerodynamics and Flow Technology > High Speed Configurations
Institute of Aeroelasticity > Aeroelastic Experiments
Deposited By: Richter, Kai
Deposited On:12 Sep 2012 14:25
Last Modified:12 Sep 2012 14:25

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