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Detection of Unsteady Boundary Layer Transition Using Three Experimental Methods

Richter, Kai and Wolf, C. Christian and Gardner, Anthony D. and Merz, Christoph B. (2016) Detection of Unsteady Boundary Layer Transition Using Three Experimental Methods. AIAA Science and Technology Forum and Exposition 2016, 04. - 08. Jan. 2016, San Diego, CA, USA.

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Official URL: https://www.aiaa-scitech.org/


Transition measurements were simultaneously performed using hot lm anemometry, pressure analysis, and differential infrared thermography (DIT) in a pitching airfoil wind tunnel test. The principles of the three detection methods will be described and results will be presented for the unsteady transition locations detected on the DSA-9A rotor blade airfoil at M = 0.3 and Re = 1.8 x 10^6. Test cases with periodic ramping motion will be compared to cases with sinusoidal oscillations. The influence of surface heating (necessary for the DIT measurements) will be analyzed and the effects of varying pitching amplitudes and frequencies on the transition detection will be discussed. Furthermore, different post-processing strategies of the DIT infrared images will be investigated and compared to the results obtained with hot film anemometry and pressure analysis.

Item URL in elib:https://elib.dlr.de/96538/
Document Type:Conference or Workshop Item (Speech)
Title:Detection of Unsteady Boundary Layer Transition Using Three Experimental Methods
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Richter, Kaikai.richter (at) dlr.deUNSPECIFIED
Wolf, C. Christianchristian.wolf (at) dlr.deUNSPECIFIED
Gardner, Anthony D.tony.gardnerædlr.deUNSPECIFIED
Merz, Christoph B.christoph.merz (at) dlr.deUNSPECIFIED
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Series Name:Conference Proceedings online
Keywords:rotor blade airfoil DSA-9A, unsteady transition, hot film anemometry, pressure analysis, differential infrared thermography, DIT
Event Title:AIAA Science and Technology Forum and Exposition 2016
Event Location:San Diego, CA, USA
Event Type:international Conference
Event Dates:04. - 08. Jan. 2016
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: Bachmann, Barbara
Deposited On:13 Jan 2017 14:52
Last Modified:13 Jan 2017 14:52

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