Two-component planar Doppler velocimetry in the compressible turbulent boundary layer

Two-component planar Doppler velocimetry in the compressible turbulent boundary layer  Non-intrusive Planar Doppler Velocimetry (PDV) has been extended to two-component measurements in a Mach 3, flat plate turbulent boundary layer and the distorted boundary layers downstream of 7° and 14° expansions. PDV results were compared to redundant Laser Doppler Velocimetry (LDV) measurements. Mean velocity results obtained with the two techniques agree to within ±5%. PDV measurements were obtained within 0.4 mm of the surface while LDV could be employed only to within approximately 2.0 mm, highlighting a near-wall resolution advantage for PDV. Effects including those associated with separate filtered and reference cameras led to PDV uncertainties of the same order as the encountered moderate turbulence intensities, precluding an investigation of instantaneous turbulence fields. Despite these difficulties, the current multi-component measurements in distorted, compressible boundary layers highlight the potential of PDV and represent progress in its ongoing evolution. Sources of error and improvements required for quantitative turbulence measurements are discussed. Further advances can be expected from ongoing development efforts. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Two-component planar Doppler velocimetry in the compressible turbulent boundary layer

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Publisher
Springer-Verlag
Copyright
Copyright © 1998 by Springer-Verlag Berlin Heidelberg
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s003480050179
Publisher site
See Article on Publisher Site

Abstract

 Non-intrusive Planar Doppler Velocimetry (PDV) has been extended to two-component measurements in a Mach 3, flat plate turbulent boundary layer and the distorted boundary layers downstream of 7° and 14° expansions. PDV results were compared to redundant Laser Doppler Velocimetry (LDV) measurements. Mean velocity results obtained with the two techniques agree to within ±5%. PDV measurements were obtained within 0.4 mm of the surface while LDV could be employed only to within approximately 2.0 mm, highlighting a near-wall resolution advantage for PDV. Effects including those associated with separate filtered and reference cameras led to PDV uncertainties of the same order as the encountered moderate turbulence intensities, precluding an investigation of instantaneous turbulence fields. Despite these difficulties, the current multi-component measurements in distorted, compressible boundary layers highlight the potential of PDV and represent progress in its ongoing evolution. Sources of error and improvements required for quantitative turbulence measurements are discussed. Further advances can be expected from ongoing development efforts.

Journal

Experiments in FluidsSpringer Journals

Published: Apr 22, 1998

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