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Boundary Layer Transition Measured by DIT on the PSP Rotor in Forward Flight

Gardner, Anthony and Weiss, Armin and Heineck, James T. and Overmeyer, Austin and Spooner, Hanna and Jain, R. K. and Wolf, Christian and Raffel, Markus (2021) Boundary Layer Transition Measured by DIT on the PSP Rotor in Forward Flight. Journal of the American Helicopter Society, 66 (2), pp. 1-10. American Helicopter Society. doi: 10.4050/JAHS.66.022008. ISSN 0002-8711.

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Official URL: https://www.ingentaconnect.com/content/ahs/jahs/2021/00000066/00000002/art00008#


A well-defined reference set of data for computational fluid dynamics and comprehensive code validation for a scaled helicopter main rotor with boundary layer transition in forward flight is presented. The boundary layer transition was measured using differential infrared thermography (DIT) on the top (suction) side of the NASA/Army "PSP rotor" in the NASA Langley 14-by-22-Foot Subsonic Tunnel. The tests used a FLIR X8500 SLS long-wave infrared camera to observe the three-bladed rotor. The boundary layer transition was detected for forward flight at an advance ratio of 0.3 (115 kt). The measured boundary layer transition positions are consistent with previous measurements and predicted boundary layer transition locations. A method for the analysis of DIT images for a rotor in forward flight is shown and validated based on computational analysis of a pitching airfoil with varying inflow, showing both qualitative and quantitative similarity to experimental data.

Item URL in elib:https://elib.dlr.de/141958/
Document Type:Article
Title:Boundary Layer Transition Measured by DIT on the PSP Rotor in Forward Flight
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Gardner, Anthonyanthony.gardner (at) dlr.dehttps://orcid.org/0000-0002-1176-3447
Weiss, ArminArmin.Weiss (at) dlr.dehttps://orcid.org/0000-0002-7532-2974
Heineck, James T.NASA Ames Research Center, Moffett Field, CA, USAUNSPECIFIED
Overmeyer, AustinUS Army CCDC AvMC, Hampton; VA; USAUNSPECIFIED
Spooner, HannaNASA Ames Research Center, Moffett Field, California 94035UNSPECIFIED
Jain, R. K.US Army CCDC AvMC, Moffet Field, CA, 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:1 April 2021
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
DOI :10.4050/JAHS.66.022008
Page Range:pp. 1-10
EditorsEmailEditor's ORCID iD
Publisher:American Helicopter Society
Keywords:Boundary layer, Transition, helicopter, rotor, infrared, thermography, experiment
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Virtual Rotorcraft and Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, GO
Deposited By: Carter, Beatrice
Deposited On:14 Jul 2021 16:02
Last Modified:24 May 2022 23:47

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