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Optimisation of Differential Infrared Thermography for Unsteady Boundary Layer Transition Measurement

Wolf, Christian and Mertens, Christoph and Gardner, Anthony and Dollinger, Christoph and Fischer, Andreas (2018) Optimisation of Differential Infrared Thermography for Unsteady Boundary Layer Transition Measurement. 44th European Rotorcraft Forum (ERF 2018), 18.-21. Sept. 2018, Delft, The Netherlands.

Full text not available from this repository.

Official URL: https://www.erf2018.org

Abstract

Differential infrared thermography (DIT) is a method of analyzing infrared images to measure the unsteady motion of the laminar-turbulent transition of a boundary layer. It uses the subtraction of two infrared images taken with a short time delay. DIT is a new technique which already demonstrated its validity in applications related to the unsteady aerodynamics of helicopter rotors in forward flight. The current study investigates a pitch-oscillating airfoil and proposes several optimizations of the original concept. These include the extension of DIT to steady test cases, a temperature compensation for long-term measurements, and a discussion of the proper infrared image separation distance. The current results also provide a deeper insight into the working principles of the technique. The results compare well to reference data acquired by unsteady pressure transducers, but at least for the current setup DIT results in an additional measurement-related lag for relevant pitching frequencies.

Item URL in elib:https://elib.dlr.de/121386/
Document Type:Conference or Workshop Item (Speech)
Title:Optimisation of Differential Infrared Thermography for Unsteady Boundary Layer Transition Measurement
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wolf, Christianchristian.wolf (at) dlr.dehttps://orcid.org/0000-0002-9052-7548
Mertens, Christophchristoph.mertens (at) dlr.deUNSPECIFIED
Gardner, Anthonyanthony.gardner (at) dlr.dehttps://orcid.org/0000-0002-1176-3447
Dollinger, ChristophUniversität BremenUNSPECIFIED
Fischer, AndreasUniversität BremenUNSPECIFIED
Date:September 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Boundary Layer Transition, Infrared Measurements
Event Title:44th European Rotorcraft Forum (ERF 2018)
Event Location:Delft, The Netherlands
Event Type:international Conference
Event Dates:18.-21. Sept. 2018
Organizer:ERF / TU Delft
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
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, GO
Deposited By: Winkels, Elisabeth
Deposited On:18 Oct 2018 15:35
Last Modified:16 Jan 2019 14:43

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