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Differential Infrared Thermography for Transition Detection on Rotor Blades

Schwermer, Till and Merz, Christoph B. and Richter, Kai and Frieling, Dominik and Raffel, Markus (2014) Differential Infrared Thermography for Transition Detection on Rotor Blades. 17th Internatinal Symposium on Application Laser Techniques to Fluid Mechanics, 07. - 10. July 2014, Lisbon, Portugal.

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Official URL: http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2014/program.asp


Differential Infrared Thermography (DIT) was applied and investigated for the detection of unsteady boundary layer transition locations on a pitching rotor blade airfoil and on a rotating blade under cyclic pitch. The paper demonstrates the unsteady transition detection with a high framing rate infrared camera and the differential infrared thermography method. DIT is based on image intensity differences between two subsequently recorded images. A pitching NACA0012 airfoil served as the first test object. The recorded images were used in order to investigate and to further improve evaluation strategies for periodically moving boundary layer transition lines. The gained knowledge has then been used for the optical measurement of unsteady transition locations on helicopter rotor blade models under cyclic pitch and rotation for the first time. Image de-rotation for tracking the blade was employed using a rotating mirror to increase exposure time without causing motion blur. The paper describes the challenges that occurred during the recording and evaluation of the data in detail. The results obtained were discussed and found to be encouraging to further improve the method towards the measurement of unsteady boundary layer transition lines on helicopter rotor models in forward flight condition without the need of blade instrumentation.

Item URL in elib:https://elib.dlr.de/87267/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Paper-Nr.: 03.7_4_218
Title:Differential Infrared Thermography for Transition Detection on Rotor Blades
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Schwermer, Tilltill.schwermer (at) dlr.deUNSPECIFIED
Merz, Christoph B.christioph.merz (at) dlr.deUNSPECIFIED
Richter, Kaikai.richter (at) dlr.deUNSPECIFIED
Frieling, Dominikdominik.frieling (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. 1-13
Series Name:Conference Proceedings online
Keywords:DIT, Infrared thermography, Transition Detection, Unsteady
Event Title:17th Internatinal Symposium on Application Laser Techniques to Fluid Mechanics
Event Location:Lisbon, Portugal
Event Type:international Conference
Event Dates:07. - 10. July 2014
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
Deposited By: Micknaus, Ilka
Deposited On:21 Jul 2014 17:14
Last Modified:21 Oct 2014 13:54

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