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New Rotor Airfoil Design Procedure for Unsteady Flow Control

Geissler, Wolfgang and Sobieczky, Helmut and Trenker, Markus (2000) New Rotor Airfoil Design Procedure for Unsteady Flow Control. 26th European Rotorcraft Forum, The Hague, The Netherlands, Sept. 26-29, 2000, 2000-09-26 - 2000-09-29, The Hague (Metherland).

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The present paper describes two different experiments performed in a transonic wind tunnel facility at DLR-Goettingen. The first experiment was conducted in order to study compressible vortices behind a cylinder and investigating the feasibility of combining two different measuring techniques: the Background Oriented Schlieren (BOS) technique and the Particle Image Velocimetry (PIV) which allow respectively to measure both density and velocity fields. The second experiment described in the present paper is done in the same wind tunnel facility where a new test section has been developed to investigate the unsteady flow about oscillating models under dynamic stall conditions. Dynamic stall is characterized by the development, movement and shedding of one or more concentrated vortices on the blade upper surface, the hysteresis loops of lift-, drag- and pitching moment are highly influenced by these vortices. To understand the very complicated unsteady flow involved, a detailed knowledge of the instantaneous flow fields is of crucial importance. With the application of the described measuring techniques it is expected to gain more insight into the problem. In recent years numerical codes based on the time-accurate solution of the Reynolds-Averaged Navier-Stokes equations (RANS) have been developed. Results from these codes are ready for comparison with experimental data. A section of the present paper is dedicated to the comparison of numerical with corresponding experimental data.

Item URL in elib:https://elib.dlr.de/13797/
Document Type:Conference or Workshop Item (Paper)
Title:New Rotor Airfoil Design Procedure for Unsteady Flow Control
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Event Title:26th European Rotorcraft Forum, The Hague, The Netherlands, Sept. 26-29, 2000
Event Location:The Hague (Metherland)
Event Type:international Conference
Event Start Date:26 September 2000
Event End Date:29 September 2000
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft (old)
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Innovative Rotorcraft (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > High Speed Configurations
Deposited By: DLR-Beauftragter, elib
Deposited On:29 Aug 2007
Last Modified:24 Apr 2024 19:00

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