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Helicopter Rotor Boundary Layer Transition Measurement in Forward Flight Using an Infrared Camera

Gardner, Anthony D. and Wolf, C. Christian and Heineck, James T. and Barnett, Miles and Raffel, Markus (2020) Helicopter Rotor Boundary Layer Transition Measurement in Forward Flight Using an Infrared Camera. Journal of the American Helicopter Society, 65 (1), pp. 2-14. American Helicopter Society. doi: 10.4050/JAHS.65.012002. ISSN 0002-8711.

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Official URL: https://doi.org/10.4050/JAHS.65.012002


Boundary layer transition measurement was demonstrated using differential infrared thermography (DIT) on the top side of a helicopter rotor in forward flight, which detects the difference in the convective heat transfer at the boundary layer transition position. The tests used a FLIR X8500xc SLS long wave infrared camera to observe the DLR EC135 test helicopter rotor. The boundary layer transition was detected for hover out of ground effect (150 ft) and for forward flight at 80 kt (1700 ft). The measured boundary layer transition positions are consistent with previous measurements of the EC135 hovering in ground effect, and with predicted boundary layer transition positions. A method for the analysis of DIT images for a rotor in forward flight is shown, based on computational analysis of a pitching airfoil with varying inflow.

Item URL in elib:https://elib.dlr.de/132342/
Document Type:Article
Title:Helicopter Rotor Boundary Layer Transition Measurement in Forward Flight Using an Infrared Camera
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Gardner, Anthony D.UNSPECIFIEDhttps://orcid.org/0000-0002-1176-3447UNSPECIFIED
Wolf, C. ChristianUNSPECIFIEDhttps://orcid.org/0000-0002-9052-7548UNSPECIFIED
Heineck, James T.NASA Ames Research Center, Moffett Field, CA, USAUNSPECIFIEDUNSPECIFIED
Raffel, MarkusUNSPECIFIEDhttps://orcid.org/0000-0002-3340-9115133716091
Date:1 January 2020
Journal or Publication Title:Journal of the American Helicopter Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 2-14
EditorsEmailEditor's ORCID iDORCID Put Code
Publisher:American Helicopter Society
Keywords:boundary layer transition, helicopter, infrared thermography, DIT, flight test
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 for Aerodynamics and Flow Technology > Helicopter, GO
Deposited By: Winkels, Elisabeth
Deposited On:18 Mar 2020 13:47
Last Modified:27 Oct 2023 14:50

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