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A new method of dynamic and static stall detection using infrared thermography

Gardner, Anthony and Wolf, Christian C. and Raffel, Markus (2016) A new method of dynamic and static stall detection using infrared thermography. Experiments in Fluids, 57 (149), pp. 1-13. Springer. doi: 10.1007/s00348-016-2235-4. ISSN 0723-4864.

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Official URL: https://doi.org/10.1007/s00348-016-2235-4


A new method of detecting flow separation for static and pitching airfoils is described, with application to the Generation of stall maps for helicopter rotors. An airfoil is heated using a lamp and a high-speed infrared camera monitors the surface temperature. Subtracting consecutive images and performing a spatial standard deviation over a region of interest yields a single σ DIT value which is used to detect boundary layer separation on the airfoil. The data can be analysed to identify attached flow (low values of σ DIT) and separated flow (high values of σ DIT). Although appropriate filtering can significantly improve the signal to noise ratio, the method is robust regarding the exact method of analysis and the unfiltered data is sufficiently clear to be analysed without additional processing. For the test airfoil used, stall was measured up to a pitching frequency of 5 Hz, and signal to noise ratios indicate that it should be possible to measure stall for a pitching frequency of 20 Hz for a carbon-fibre surface with the thermal properties used.

Item URL in elib:https://elib.dlr.de/104688/
Document Type:Article
Additional Information:ISSN: 1432-1114 (Online) 0723-4864 (Print)
Title:A new method of dynamic and static stall detection using infrared thermography
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Gardner, Anthonyanthony.gardner (at) dlr.dehttps://orcid.org/0000-0002-1176-3447
Wolf, Christian C.christian.wolf (at) dlr.deUNSPECIFIED
Raffel, MarkusMarkus.Raffel (at) dlr.dehttps://orcid.org/0000-0002-3340-9115
Date:1 September 2016
Journal or Publication Title:Experiments in Fluids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1007/s00348-016-2235-4
Page Range:pp. 1-13
EditorsEmailEditor's ORCID iD
Keywords:stall detection, flow visualisation, infrared thermography, dynamic stall, rotor blade
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: Bachmann, Barbara
Deposited On:11 Jan 2017 14:18
Last Modified:05 Nov 2020 11:59

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