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
Abstract
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/ | ||||||||||||
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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 | ||||||||||||
Authors: |
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Date: | 1 September 2016 | ||||||||||||
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: | 57 | ||||||||||||
DOI : | 10.1007/s00348-016-2235-4 | ||||||||||||
Page Range: | pp. 1-13 | ||||||||||||
Editors: |
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Publisher: | Springer | ||||||||||||
ISSN: | 0723-4864 | ||||||||||||
Status: | Published | ||||||||||||
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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