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Unsteady boundary layer transition measurements by differential infrared thermography

Merz, Christoph B. and Richter, Kai and Raffel, Markus (2014) Unsteady boundary layer transition measurements by differential infrared thermography. AHS - 70th Annual Forum of the American Helicopter Society, 20. - 22. Mai 2014, Montreal, Canada.

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Official URL: http://vtol.org/annual-forum/forum-70/forum-70


Maintaining laminar flow over a large portion of a rotor blade reduces drag appreciably. Therefore, the location of boundary layer transition is an important design parameter for rotor blades. Unsteady laminar/turbulent boundary layer transition is of special interest, since modern rotor blade design methodologies increasingly take dynamic performance of into account. Once the design is concluded, the real transition position on the blade is of great interest as the knowledge of the exact transition position is needed for both the validation of the design and the performance assessment. The paper demonstrates the detection of unsteady boundary layer transition with a high framing rate infrared camera and the differential infrared thermography (DIT) method. DIT is based on image intensity differences between two subsequently recorded measurement images. A pitching NACA0012 airfoil served as the test object. The measurement results are compared with the results of unsteady CFD simulations based on the DLR TAU code.

Item URL in elib:https://elib.dlr.de/85447/
Document Type:Conference or Workshop Item (Speech)
Title:Unsteady boundary layer transition measurements by differential infrared thermography
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Merz, Christoph B.christoph.merz (at) dlr.deUNSPECIFIED
Richter, Kaikai.richter (at) dlr.deUNSPECIFIED
Raffel, Markusmarkus.raffel (at) dlr.deUNSPECIFIED
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-9
Series Name:Conference Proceedings on CD-ROM
Keywords:pitching NACA0012 airfoil, transition, infrared thermography
Event Title:AHS - 70th Annual Forum of the American Helicopter Society
Event Location:Montreal, Canada
Event Type:international Conference
Event Dates:20. - 22. Mai 2014
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: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Deposited By: Micknaus, Ilka
Deposited On:10 Jun 2014 16:52
Last Modified:17 Feb 2015 14:24

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