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Transition measurements of upper and lower rotor blade surfaces in forward flight with thermography

Heineck, James T. and Overmeyer, Austin and Spooner, Hanna and Gardner, Anthony and Weiss, Armin and Raffel, Markus (2020) Transition measurements of upper and lower rotor blade surfaces in forward flight with thermography. In: AIAA Aviation Forum 2020. AIAA Aviation Forum 2020, 15.-19.6.2020, Virtuell (Reno, NV; USA). doi: 10.2514/6.2020-3103.

Full text not available from this repository.

Official URL: https://doi.org/10.2514/6.2020-3103

Abstract

Thermography allows for imaging the location of laminar-to-turbulent boundary layer transition on surfaces in air flows. The determination of BL transition of rotor blades was done in 2017 on the lower surface of a rotor blade in forward flight in the NASA Langley 14- by 22-Foot Subsonic Tunnel Subsonic Wind Tunnel. This article reports on the follow-on experiment in the same facility and the same blades where thermography was performed on both upper and lower surface synchronously, with the upper surface mapped throughout the full azimuthal range. Blade-tracking rotating mirrors were used for each thermal camera and were synchronized for simultaneous image acquisition. Furthermore, the Differential Infrared Thermography (DIT) technique depicts the unsteady nature of the BL transition in forward flight. Results are presented and discussed. These data are the first ever recorded of both surfaces of a rotor in forward flight.

Item URL in elib:https://elib.dlr.de/135952/
Document Type:Conference or Workshop Item (Speech)
Title:Transition measurements of upper and lower rotor blade surfaces in forward flight with thermography
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Heineck, James T.NASA Ames Research Center, Moffett Field, California 94035UNSPECIFIED
Overmeyer, AustinUS Army CCDC, Langley Research Center, Hampton; VA; USAUNSPECIFIED
Spooner, HannaNASA Ames Research Center, Moffett Field, California 94035UNSPECIFIED
Gardner, Anthonyanthony.gardner (at) dlr.dehttps://orcid.org/0000-0002-1176-3447
Weiss, ArminArmin.Weiss (at) dlr.dehttps://orcid.org/0000-0002-7532-2974
Raffel, MarkusMarkus.Raffel (at) dlr.dehttps://orcid.org/0000-0002-3340-9115
Date:8 June 2020
Journal or Publication Title:AIAA Aviation Forum 2020
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.2514/6.2020-3103
Editors:
EditorsEmailEditor's ORCID iD
UNSPECIFIEDAIAAUNSPECIFIED
Status:Published
Keywords:Differential Infrared Thermography, DIT, boundary layer transition, laminar, turbulent, helicopter, rotor blade, wind tunnel
Event Title:AIAA Aviation Forum 2020
Event Location:Virtuell (Reno, NV; USA)
Event Type:international Conference
Event Dates:15.-19.6.2020
Organizer:AIAA
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
Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Carter, Beatrice
Deposited On:09 Sep 2020 22:54
Last Modified:16 Nov 2020 16:55

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