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Unsteady Boundary Layer Transition on the DSA-9A Rotor Blade Airfoil

Richter, Kai and Koch, Stefan and Goerttler, Andreas and Lütke, Benjamin and Wolf, Christian C. and Benkel, Andreas (2015) Unsteady Boundary Layer Transition on the DSA-9A Rotor Blade Airfoil. European Rotorcraft Forum 2015, 01. – 04. September 2015, Munich, Germany.

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


The unsteady boundary layer transition on the pitching helicopter main rotor blade airfoil DSA-9A was experimentally investigated by the use of hot film anemometry and unsteady pressure measurements. The unsteady flow characteristics on the upper and the lower side of the airfoil were analyzed for steady test cases and dynamic cases with sinusoidal pitching motion in attached flow conditions at M = 0:30 and Re = 1:8 x 10^6. The paper discusses the unsteady transition characteristics in detail and presents the influence of the pitching frequency on the unsteady transition. The results indicate that a large transition hysteresis exists on both sides of the airfoil, and that the hysteresis is much larger than can be explained by the unsteadiness in lift. Significant transition zones exist on the airfoil with sizes of up to 55% chord. The frequency influence is seen in an increase in the hysteresis and in a reduction of the size of the transition zone with increasing frequency.

Item URL in elib:https://elib.dlr.de/95325/
Document Type:Conference or Workshop Item (Speech)
Additional Information:ERF2015_0099
Title:Unsteady Boundary Layer Transition on the DSA-9A Rotor Blade Airfoil
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Richter, Kaikai.richter (at) dlr.deUNSPECIFIED
Koch, Stefanstefan.koch (at) dlr.deUNSPECIFIED
Goerttler, Andreasandreas.goerttler (at) dlr.deUNSPECIFIED
Lütke, Benjaminbenjamin.luetke (at) dlr.deUNSPECIFIED
Wolf, Christian C.christian.wolf (at) dlr.deUNSPECIFIED
Benkel, Andreasandreas.benkel (at) dnw.aeroUNSPECIFIED
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-17
Series Name:Conference Proceedings online
Keywords:rotor blade airfoil DSA-9A, unsteady transition, hot film anemometry, DNW-TWG
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: Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Institute of Aerodynamics and Flow Technology > High Speed Configurations
Institute of Aeroelasticity > Aeroelastic Experiments
German-Dutch Windtunnels > Business Unit Göttingen und Köln (GUK)
Institute of Flight Systems > Rotorcraft
Deposited By: Micknaus, Ilka
Deposited On:05 Oct 2015 14:48
Last Modified:06 Oct 2015 11:41

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