elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Contact | Deutsch
Fontsize: [-] Text [+]

PIV Measurements of unsteady transonic flow fields above a NACA 0012 Airfoil

Raffel, M. and Kompenhans, J. (1993) PIV Measurements of unsteady transonic flow fields above a NACA 0012 Airfoil. In: SPIE VOL 2052 Laser Anemometery Advances and Applications, 2052, pp. 527-534. Vortrag Fifth Int. Conference LASER ANEMOMETRY - ADVANCES AND APPLICATIONS; in Koningshof, 23.8.-27.8.93, Niederlande.

Full text not available from this repository.

Abstract

Particle Image Velocimetry (PIV) is increasingly used to investigate unsteady velocity field instantaneously. At DLR an experimental set-up for PIV has been developed which can be operatred under the rough environmental conditions of a large wind tunnel. This system has successfully been applied as well to low speed as to high speed flows (U &#61 10. 500 m/s). The evaluation and post processing of the PIV recordings runs fully automatical on a work station. The paper will describe investigations of instantaneous transonic flow fields above a NACA 0012 airfoil at different angles of attack. Some improvements of the PIV technique had to be carried out in order to be able to utilize the PIV technique in a high speed wind tunnel with a measuring time of less than 20 seconds. Among these improvements are a fas focusing device for the recording camera, on line observation of seeding with tracer particles, master control unit for automatic control of the whole measuring sequence and the data aquisition of pressure, temperature, anlge of attack etc. A high speed image shifting system is required in order to be able to measure even in reverse flows or in order to optimize the dynamic range of the evaluation. For this purpose a high speed rotating mirror system was developed. The frequency of rotation ranges from 1 Hz to 50 Hz, thus covering a range of shift velocities from 10 m/s to 500 m/s (at a ratio of reduction of 1:7 between oberservation plane in the flow to the recording plane).

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1993,
Title:PIV Measurements of unsteady transonic flow fields above a NACA 0012 Airfoil
Authors:
AuthorsInstitution or Email of Authors
Raffel, M.UNSPECIFIED
Kompenhans, J.UNSPECIFIED
Date:1993
Journal or Publication Title:SPIE VOL 2052 Laser Anemometery Advances and Applications
Volume:2052
Page Range:pp. 527-534
Status:Published
Keywords:Particle Image Velocimetry, high speed flows, unsteady flows
Event Title:Vortrag Fifth Int. Conference LASER ANEMOMETRY - ADVANCES AND APPLICATIONS; in Koningshof, 23.8.-27.8.93, Niederlande
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 10:07

Repository Staff Only: item control page

Browse
Search
Help & Contact
Informationen
electronic library is running on EPrints 3.3.12
Copyright © 2008-2012 German Aerospace Center (DLR). All rights reserved.