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A Study of Some Measurement Errors in L2F - Velocimetry

Kost, F. (1992) A Study of Some Measurement Errors in L2F - Velocimetry. Proceedings of the 11th Symposium of "Measuring Techniques for Transonic and Supersonic Flow in Cascades and Turbomachines", Universitaet der Bundeswehr, Muenchen, September 1992.

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Abstract

In high speed flows the measurement accuracy of Laser-Two-Focus velocimetry is mainly determined by the statistical error due to insufficient number of sampled particles. Nevertheless there exist a lot of other sources of measurement error which may reduce the accuracy of the results: The geometry of the measurement volume leadsto systematic errors in the turbulence degree. Windows which permit optical access to the internal flow may disturb the flow or distort the Laser measurement volume. The evaluation procedure may add some uncertainty. In the present study some of these measurement errors have been investigated numerically. In some cases systematic errors can be circumvented or may be corrected quantiatatively. It can also be shown that measurement time may be reduced by choosing adequate parameters for the L2F-device and the measurement procedure, without affecting measurement accuracy.

Document Type:Conference or Workshop Item (Paper)
Additional Information: institution=Prof. L. Fottner/Universitaet der Bundeswehr, Muenchen, LIDO-Berichtsjahr=1992, pages=20,
Title:A Study of Some Measurement Errors in L2F - Velocimetry
Authors:
AuthorsInstitution or Email of Authors
Kost, F.UNSPECIFIED
Date:1992
Status:Published
Keywords:Laser-velocimetry, Laser-Two-Focus-velocimetry, measurement error, turbulence measurement.
Event Title:Proceedings of the 11th Symposium of "Measuring Techniques for Transonic and Supersonic Flow in Cascades and Turbomachines", Universitaet der Bundeswehr, Muenchen, September 1992
HGF - Research field:UNSPECIFIED
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
DLR - Program:L TT - Triebwerkstechnologien
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

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