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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 (2019) Helicopter Rotor Boundary Layer Transition Measurement in Forward Flight Using an Infrared Camera. In: Proceedings of the 75th Annual Forum and Technology Display, pp. 1-13. VFS 75th Annual Forum & Technology Display, 13.-16. Mai 2019, Philadelphia, PA, USA.

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Official URL: https://vtol.org/

Abstract

Boundary layer transition measurement was demonstrated using differential infrared thermography on the top side of a helicopter rotor in forward flight. 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/126826/
Document Type:Conference or Workshop Item (Speech)
Title:Helicopter Rotor Boundary Layer Transition Measurement in Forward Flight Using an Infrared Camera
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gardner, Anthony D.anthony.gardner (at) dlr.dehttps://orcid.org/0000-0002-1176-3447
Wolf, C. ChristianChristian.Wolf (at) dlr.dehttps://orcid.org/0000-0002-9052-7548
Heineck, James T.NASA Ames Research Center, Moffett Field, CA, USAUNSPECIFIED
Barnett, Milesmiles.barnett (at) dlr.deUNSPECIFIED
Raffel, Markusmarkus.raffel (at) dlr.dehttps://orcid.org/0000-0002-3340-9115
Date:May 2019
Journal or Publication Title:Proceedings of the 75th Annual Forum and Technology Display
Refereed publication:Yes
Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Page Range:pp. 1-13
Series Name:Conference Proceedings digital
Status:Published
Keywords:boundary layer transition, helicopter, infrared thermography, DIT, flight test
Event Title:VFS 75th Annual Forum & Technology Display
Event Location:Philadelphia, PA, USA
Event Type:international Conference
Event Dates:13.-16. Mai 2019
Organizer:AHS - The Vertical Flight Society
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: Braunschweig , Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, GO
Flight Experiments > Braunschweig
Deposited By: Winkels, Elisabeth
Deposited On:12 Jun 2019 10:39
Last Modified:19 Sep 2019 13:33

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