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FREQUENCY RESOLUTION OF HIGH-SPEED PIV

Henning, Arne and Ehrenfried, Klaus (2007) FREQUENCY RESOLUTION OF HIGH-SPEED PIV. ODAS 2007 - 8th ONERA-DLR Aerospace Symposium, 2007-10-17 - 2007-10-19, Göttingen.

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Abstract

High speed particle image velocimetry (PIV) measurements with a sample frequency of 20 kHz are conducted in order to characterize the temporal response of such a system. The limits and drawbacks associated with the PIV measurement technique regarding the frequency analysis of the obtained velocity time series are investigated. Hot wire measurements are performed for comparison. In contrast to time resolved analog measurement techniques (e.g. hot wire anemometry) it is not possible to apply analog filters to the PIV signal in order to avoid aliasing effects. But the PIV processing itself acts like a filter in space and time. Here a special attention is turned on the influence of the interrogation window size for the PIV analysis on the frequency spectrum. Two types of flows are chosen for the here presented study. The first is grid turbulence. It provides nearly homogeneous and isotropic turbulence at a certain distance downstream of the grid. The second is the wake behind a cylinder, where the flow field has a more inhomogeneous character. It can be shown that the spatial averaging in the interrogation window results in a low pass filter for the frequency response and the transfer function is a modified sinc function.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:FREQUENCY RESOLUTION OF HIGH-SPEED PIV
Authors:
AuthorsInstitution or Email of Authors
Henning, ArneTU-Berlin
Ehrenfried, KlausUNSPECIFIED
Date:2007
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Volume:CD-ROM
Page Range:pp. 1-12
Series Name:Conference Proceedings
Status:Published
Keywords:High-speed PIV, spectrum, frequency resolution, transfer function
Event Title:ODAS 2007 - 8th ONERA-DLR Aerospace Symposium
Event Location:Göttingen
Event Type:international Conference
Event Dates:2007-10-17 - 2007-10-19
Organizer:DLR
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Ilka Micknaus
Deposited On:13 Nov 2007
Last Modified:27 Apr 2009 14:26

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