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Erschienen in: Experiments in Fluids 1/2015

01.01.2015 | Research Article

High-speed particle image velocimetry for the efficient measurement of turbulence statistics

verfasst von: Christian E. Willert

Erschienen in: Experiments in Fluids | Ausgabe 1/2015

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Abstract

A high-frame-rate camera and a continuous-wave laser are used to capture long particle image sequences exceeding 100,000 consecutive frames at framing frequencies up to 20 kHz. The electronic shutter of the high-speed CMOS camera is reduced to \(10\,\upmu\)s to prevent excessive particle image streaking. The combination of large image number and high frame rate is possible by limiting the field of view to a narrow strip, primarily to capture temporally resolved profiles of velocity and derived quantities, such as vorticity as well as higher order statistics. Multi-frame PIV processing algorithms are employed to improve the dynamic range of recovered PIV data. The recovered data are temporally well resolved and provide sufficient samples for statistical convergence of the fluctuating velocity components. The measurement technique is demonstrated on a spatially developing turbulent boundary layer inside a small wind tunnel with \(Re_\delta = 4{,}800,\, Re_\tau = 240\) and \(Re_\theta = 515\). The chosen magnification permits a reliable estimation of the mean velocity profile down to a few wall units and yields statistical information such as the Reynolds stress components and probability density functions. By means of single-line correlation, it is further possible to extract the near-wall velocity profile in the viscous sublayer, both time-averaged as well as instantaneous, which permits the estimation the wall shear rate \(\dot{\gamma }\) and along with it the shear stress \(\tau _w\) and friction velocity \(u_\tau\). These data are then used for the calculation of space-time correlation maps of wall shear stress and velocity.

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Fußnoten
1
Displacements larger than \(\frac{1}{2}\)IW are recoverable with advanced PIV processing methods but impose other restrictions.
 
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Metadaten
Titel
High-speed particle image velocimetry for the efficient measurement of turbulence statistics
verfasst von
Christian E. Willert
Publikationsdatum
01.01.2015
Verlag
Springer Berlin Heidelberg
Erschienen in
Experiments in Fluids / Ausgabe 1/2015
Print ISSN: 0723-4864
Elektronische ISSN: 1432-1114
DOI
https://doi.org/10.1007/s00348-014-1892-4

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