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Numerical and Experimental Investigations of Unsteady Flows under Deep Dynamic Stall Conditions

Geißler, W. and Kompenhans, J. and Raffel, M. Vollmers, H., and Wernert, P.(1) (1994) Numerical and Experimental Investigations of Unsteady Flows under Deep Dynamic Stall Conditions. 20th European Rotorcraft Forum, 4.-7. Oct. 1994, Amsterdam, The Netherlands.

Full text not available from this repository.

Abstract

With increasing advance ratios the retreating blades of modern helicopters encounter flow environments with severe separation and vortex shedding which are known as deep dynamic stall conditions. Recently considerable improvements have been achieved for both numerical methods and nonintrusive experimental flow diagnostic techniques to be applied to these complex highly unsteady flows. For the numerical treatment of the problem a time-accurate code based on the 2D-Navier-Stokes equations has been applied. The experimental investigation of the instantaneous flowfield was carried out by means of a Particle Image Velocimetry (PIV), in two different wind tunnel facilities: The low-speed wind tunnel of the German-French Institute, St. Louis (ISL) and the High Speed Wind tunnel (HKG) of the DLr in Goettingen. For each wind tunnel a test set-up for oscillating models exists and has been constructed and used throughout the measurements. Numerical and experimental data obtained under the same conditions will be presented and compared in the present paper.

Document Type:Conference or Workshop Item (Paper)
Additional Information: institution=20th European Rotorcraft Forum Proceedings, LIDO-Berichtsjahr=1994, pages=18,
Title:Numerical and Experimental Investigations of Unsteady Flows under Deep Dynamic Stall Conditions
Authors:
AuthorsInstitution or Email of Authors
Geißler, W.UNSPECIFIED
Kompenhans, J.UNSPECIFIED
Raffel, M. Vollmers, H., UNSPECIFIED
Wernert, P.(1)UNSPECIFIED
Date:1994
Series Name:Paper No. 22
Status:Published
Keywords:Unsteady Separation, Numerical Calculations, Technical, Helicopter Aerodynamics
Event Title:20th European Rotorcraft Forum, 4.-7. Oct. 1994, Amsterdam, The Netherlands
HGF - Research field:UNSPECIFIED
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
DLR - Program:L DT - Drehflüglertechnologien
DLR - Research theme (Project):UNSPECIFIED
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Strömungsmechanik > Institut für Experimentelle Strömungsmechanik
Deposited By: elib DLR-Beauftragter
Deposited On:03 Apr 2006
Last Modified:27 Apr 2009 10:08

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