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Boundary-layer transition measurements on hovering helicopter rotors by infrared thermography

Richter, Kai and Schülein, Erich (2014) Boundary-layer transition measurements on hovering helicopter rotors by infrared thermography. Experiments in Fluids, 55 (7), pp. 1-13. Springer. doi: 10.1007/s00348-014-1755-z. ISSN 0723-4864.

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Official URL: http://link.springer.com/journal/volumesAndIssues/348


High speed infrared thermography was applied for boundary layer transition measurements on the upper side of helicopter rotors. The transition detection is based on the analysis of a single instantaneous thermal image of the rotating blade and allows the determination of both the locations of the onset and of the end of the transition region. Measurements were performed on a Mach scaled BO105 model rotor for different rotation frequencies. The transition characteristics are presented and compared to two-dimensional numerical simulations, and the measurement scatter is discussed. Additional transition measurements were performed on the main rotors of the DLR research helicopters Eurocopter BO105 and EC135. The transition behavior of the EC135 rotor blade is presented for different cases and the effect of the contamination of the rotor blade leading edge on the laminar flow is discussed.

Item URL in elib:https://elib.dlr.de/84573/
Document Type:Article
Additional Information:Published online: 28 June 2014
Title:Boundary-layer transition measurements on hovering helicopter rotors by infrared thermography
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Richter, Kaikai.richter (at) dlr.deUNSPECIFIED
Schülein, Ericherich.schuelein (at) dlr.deUNSPECIFIED
Journal or Publication Title:Experiments in Fluids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1007/s00348-014-1755-z
Page Range:pp. 1-13
Keywords:Rotor blade, transition, hover, infrared thermography, helicopter
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 of Aerodynamics and Flow Technology > Helicopters
Institute of Aerodynamics and Flow Technology > High Speed Configurations
Deposited By: Micknaus, Ilka
Deposited On:14 Jul 2014 15:36
Last Modified:06 Sep 2019 15:25

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