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Differential infrared thermography for boundary layer transition detection on pitching rotor blade models

Raffel, Markus and Merz, Christoph B. and Schwermer, Till and Richter, Kai (2015) Differential infrared thermography for boundary layer transition detection on pitching rotor blade models. Experiments in Fluids, 56 (2), pp. 1-22. Springer. DOI: 10.1007/s00348-015-1905-y ISSN 0723-4864

Full text not available from this repository.

Official URL: http://link.springer.com/journal/348/

Abstract

Differential infrared thermography (DIT) was investigated and applied for the detection of unsteady boundary layer transition locations on a pitching airfoil and on a rotating blade under cyclic pitch. DIT is based on image intensity differences between two successively recorded infrared images. The images were recorded with a high framing rate infrared camera. 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 measurement results are compared with the results of unsteady CFD simulations based on the DLR-TAU code. DIT was then used for the first time for the optical measurement of unsteady transition locations on helicopter rotor blade models under cyclic pitch and rotation. 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. However, the results were found to be encouraging to further improve the method toward the measurement of unsteady boundary layer transition lines on helicopter rotor models in forward flight.

Item URL in elib:https://elib.dlr.de/91938/
Document Type:Article
Additional Information:Published online: 31 January 2015, Exp. Fluids (2015) 56:30
Title:Differential infrared thermography for boundary layer transition detection on pitching rotor blade models
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Raffel, Markusmarkus.raffel (at) dlr.deUNSPECIFIED
Merz, Christoph B.christoph.merz (at) dlr.deUNSPECIFIED
Schwermer, Tilltill.schwermer (at) dlr.deUNSPECIFIED
Richter, Kaikai.richter (at) dlr.deUNSPECIFIED
Date:2015
Journal or Publication Title:Experiments in Fluids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:56
DOI :10.1007/s00348-015-1905-y
Page Range:pp. 1-22
Publisher:Springer
ISSN:0723-4864
Status:Published
Keywords:Differential Infrared Therography, Boundary Layer, Rotor Blade Models
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 of Aerodynamics and Flow Technology > Helicopters
Deposited By: Micknaus, Ilka
Deposited On:05 May 2015 15:14
Last Modified:06 Sep 2019 15:25

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