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Rotating Blade Stall Maps Measured by Differential Infrared Thermography

Raffel, Markus and Gardner, Anthony and Schwermer, Till and Merz, Christoph and Weiss, Armin and Braukmann, Johannes N. and Wolf, Christian (2017) Rotating Blade Stall Maps Measured by Differential Infrared Thermography. AIAA Journal. American Institute of Aeronautics and Astronautics (AIAA). DOI: 10.2514/1.J055452 ISSN 0001-1452

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Official URL: https://arc.aiaa.org

Abstract

RAFFEL and Merz [1] demonstrated the feasibility of unsteady boundary-layer transition detection by differential infrared thermography (DIT), a method whereby the difference of two sequentially recorded infrared images is analyzed to extract the point of greatest difference between the flows, which, for attached flows, is equivalent to the transition position. For flows with dynamic flow separation, the strongest feature in the infrared difference images is no longer the transition, but the separation of the flow. Gardner and Richter [2] showed that the standard deviation of pressure measurements at the transition point has a small peak, but that separated flow results in an even larger peak. Similarly, the infrared images can be analyzed to extract the presence and extent of separated flowover an airfoil. DIT offers a great advantage over using pressure sensors as indicators for separated flow because DIT does not require any special equipment to be attached to or built into the model observed. The major aim of the investigations presented here is the generation of “stall maps” in which stalled areas in the rotor plane are geometrically described. Currently, these maps are often produced through the investigation of pressure sensor data from sensors integrated into the rotor blades [3]. Alternatives are the use of tuft visualization [4] or pressure-sensitive paint [5]. However, these techniques require installations or coatings on the rotor blades, which can be avoided by the technique described in the following

Item URL in elib:https://elib.dlr.de/116260/
Document Type:Article
Additional Information:AIAA Journal, Vol. 55, No. 5, 2017
Title:Rotating Blade Stall Maps Measured by Differential Infrared Thermography
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Raffel, MarkusMarkus.Raffel (at) dlr.deUNSPECIFIED
Gardner, Anthonyanthony.gardner (at) dlr.dehttps://orcid.org/0000-0002-1176-3447
Schwermer, TillTill.Schwermer (at) dlr.dehttps://orcid.org/0000-0002-6918-4480
Merz, ChristophChristoph.Merz (at) dlr.deUNSPECIFIED
Weiss, ArminArmin.Weiss (at) dlr.deUNSPECIFIED
Braukmann, Johannes N.Johannes.Braukmann (at) dlr.dehttps://orcid.org/0000-0001-8046-9623
Wolf, ChristianChristian.Wolf (at) dlr.dehttps://orcid.org/0000-0002-9052-7548
Date:2017
Journal or Publication Title:AIAA Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.2514/1.J055452
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
ISSN:0001-1452
Status:Published
Keywords:Differential infrared thermography, DIT, boundary layer transition, infrared, measurement
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
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, GO
Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Bachmann, Barbara
Deposited On:07 Dec 2017 15:36
Last Modified:08 Mar 2018 18:42

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