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Boundary Layer Transition Visualization of a Helicopter Blade in Forward Flight Using Thermography

Heineck, James T. and Overmeyer, Austin D. and Wolf, Christian and Raffel, Markus (2018) Boundary Layer Transition Visualization of a Helicopter Blade in Forward Flight Using Thermography. 18th International Symposium on Flow Visualization ISFV 18, 26.-29. Juni 2018, Zürich, Switzerland.

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Official URL: https://www.isfv18.ethz.ch


The boundary layer transition detection technique by thermography has been extended to a wind tunnel model simulating helicopter forward flight conditions. The helicopter blade is a generic NASA RC series airfoil 66.75 in (1.7 m) span with a 5.45 in (13.8 cm) chord as a part of a three-blade system. Testing was done at the NASA Langley 14- x 22-foot Subsonic Wind Tunnel. The image de-rotation method was employed to improve signal-to-noise and for high-frequency image acquisition to enable the use of the Differential Infrared Thermography (DIT) technique. This method allows the visualization of changes in the transition front due to varying instantaneous in-flow conditions of the blade throughout the rotor disk. This paper describes the complex imaging installation, offers sample data processed with several techniques and discusses the relevance to CFD validation.

Item URL in elib:https://elib.dlr.de/120713/
Document Type:Conference or Workshop Item (Speech)
Title:Boundary Layer Transition Visualization of a Helicopter Blade in Forward Flight Using Thermography
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Heineck, James T.NASA Ames Research Center, Moffett Field, California 94035UNSPECIFIED
Overmeyer, Austin D.NASA, Langley, Hampton, VA, USAUNSPECIFIED
Wolf, ChristianChristian.Wolf (at) dlr.dehttps://orcid.org/0000-0002-9052-7548
Raffel, Markusmarkus.raffel (at) dlr.dehttps://orcid.org/0000-0002-3340-9115
Date:June 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Boundary Layer Transition, Rotorcraft Blade Aerodynamics, Thermography, Differential Infrared Transition (DIT) Measurement
Event Title:18th International Symposium on Flow Visualization ISFV 18
Event Location:Zürich, Switzerland
Event Type:international Conference
Event Dates:26.-29. Juni 2018
Organizer:ETH Zürich
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:04 Jul 2018 11:16
Last Modified:01 Dec 2018 19:53

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