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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: 45th European Rotorcraft Forum ERF 2019. 45th European Rotorcraft Forum ERF 2019, 2019-09-17 - 2019-09-20, Warsaw, Poland.

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Official URL: http://erf2019.pw.edu.pl/


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/128846/
Document Type:Conference or Workshop Item (Speech)
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/0000-0002-3340-9115133716076
Date:September 2019
Journal or Publication Title:45th European Rotorcraft Forum ERF 2019
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:boundary layer transition, helicopter, infrared thermography, DIT, flight test
Event Title:45th European Rotorcraft Forum ERF 2019
Event Location:Warsaw, Poland
Event Type:international Conference
Event Start Date:17 September 2019
Event End Date:20 September 2019
Organizer:Politechnika Warszawska, ITLiMS
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: Braunschweig , Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, GO
Flight Experiments > Braunschweig
Deposited By: Winkels, Elisabeth
Deposited On:26 Sep 2019 11:06
Last Modified:24 Apr 2024 20:32

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