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“Instationäre Transitionsmessung mit neuartigen Messmethoden”

Wolf, Christian and Gardner, Anthony and Goerttler, Andreas and Richter, Kai (2016) “Instationäre Transitionsmessung mit neuartigen Messmethoden”. Deutscher Luft- und Raumfahrtkongress, 13.-15. Sep. 2016, Braunschweig, Deutschland.

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Hot film anemometry, surface pressure analysis, and differential infrared thermography(DIT) were simultaneously applied for the detection of unsteady boundary layer transition on a pitching helicopter main rotor blade airfoil at M = 0.30 and Re = 1.8E6. Results are presented for test cases with periodic ramp motion and for cases with sinusoidal motion. Good agreement exists between the results of the different techniques. The transition points detected both by the pressure analysis and by the DIT are always located within the transition region measured by the hot film anemometry. The agreement is excellent for low pitch rates, with differences increasing for high pitch rates, leading to a maximum offset of x=c = 0.03 for transition occurring upstream of 30% chord. The influence of the pitching frequency on the transition movement is detected by the hot film anemometry and by the pressure analysis in the same manner, whereas the DIT results exhibit a stronger frequency effect and an additional offset in the hysteresis compared to the results of the other techniques.

Item URL in elib:https://elib.dlr.de/110764/
Document Type:Conference or Workshop Item (Keynote)
Title:“Instationäre Transitionsmessung mit neuartigen Messmethoden”
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Wolf, Christianchristian.wolf (at) dlr.dehttps://orcid.org/0000-0002-9052-7548
Gardner, Anthonyanthony.gardner (at) dlr.dehttps://orcid.org/0000-0002-1176-3447
Goerttler, Andreasandreas.goerttler (at) dlr.deUNSPECIFIED
Richter, KaiKai.Richter (at) dlr.deUNSPECIFIED
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Measurement techniques, boundary layer transition, infrared, sigmacp, hotfilm, unsteady aerodynamics
Event Title:Deutscher Luft- und Raumfahrtkongress
Event Location:Braunschweig, Deutschland
Event Type:national Conference
Event Dates:13.-15. Sep. 2016
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: Bachmann, Barbara
Deposited On:18 Jan 2017 16:33
Last Modified:01 Dec 2018 19:52

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