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Pitching airfoil subjected to high amplitude free stream oscillations

Strangfeld, Christoph and Müller-Vahl, Hanns F. and Greenblatt, David and van der Wall, Berend G. and Nayeri, C. Navid and Paschereit, Christoph O. (2015) Pitching airfoil subjected to high amplitude free stream oscillations. 41st European Rotorcraft Forum, 01.-04. Sept. 2015, München, Deutschland.

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Abstract

An experimental investigation was carried out to quantify the aerodynamic lift acting on a NACA 0018 airfoil subjected to combined pitching and surging and to compare the results to established theories. A dedicated unsteady wind tunnel was employed that produces large surge amplitudes, and airfoil loads were estimated by means of unsteady surface mounted pressure measurements. In-phase and out-of-phase pre-stall pitching and surging cases were considered for different velocity amplitudes. When the flow was fully attached, satisfactory correspondence was observed between experiments and theory. However, differences were observed when trailing-edge separation was present; in particular the shedding of a trailing-edge vortex corresponded with discrepancies between the experiments and theory.

Item URL in elib:https://elib.dlr.de/97087/
Document Type:Conference or Workshop Item (Speech)
Title:Pitching airfoil subjected to high amplitude free stream oscillations
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Strangfeld, ChristophTU BerlinUNSPECIFIED
Müller-Vahl, Hanns F.Technion - Israel Institute of Technology, IsraelUNSPECIFIED
Greenblatt, DavidTechnion - Israel Institute of Technology, IsraelUNSPECIFIED
van der Wall, Berend G.FT-HUBUNSPECIFIED
Nayeri, C. NavidTU BerlinUNSPECIFIED
Paschereit, Christoph O.Institut für Strömungsmechanik und Technische Akustik, TU BerlinUNSPECIFIED
Date:3 September 2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-11
Status:Published
Keywords:unsteady aerodynamics, free-stream oscillation, wind energy, helicopter rotor
Event Title:41st European Rotorcraft Forum
Event Location:München, Deutschland
Event Type:international Conference
Event Dates:01.-04. Sept. 2015
Organizer:Deutsche Gesellschaft für Luft- und Raumfahrt (DGLR)
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 Innovative Rotorcraft
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Rotorcraft
Deposited By: van der Wall, Prof. Dr. Berend G.
Deposited On:05 Oct 2015 11:35
Last Modified:05 Oct 2015 11:35

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