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Experiments in Fluids

, 59:106 | Cite as

Pulse-burst PIV of an impulsively started cylinder in a shock tube for Re > 105

  • Justin L. Wagner
  • Edward P. DeMauro
  • Katya M. Casper
  • Steven J. Beresh
  • Kyle P. Lynch
  • Brian O. Pruett
Research Article

Abstract

The impulsive start of a circular cylinder in a shock tube was characterized with time-resolved particle image velocimetry measurements (TR-PIV) at 50 kHz using a pulse-burst laser. Three Reynolds numbers Re of 1.07, 1.63 and 2.46 × 105 were studied adding insight into the transient process near the drag crisis. In all cases, vorticity was maximum in the first pair of vortices formed. In a fashion analogous to previous studies at Re ≤ 104, a single symmetric vortex pair was first shed from the cylinder at Re = 1.07 × 105 prior to the eventual transition to a von Kármán vortex street. In contrast, at Re ≥ 1.63 × 105, two or more symmetric vortex pairs were first shed. The non-dimensional time for the wake to begin to exhibit asymmetry was also found to be lower at the two higher Re. The time required to reach a fully antisymmetric wake (peak von Kármán shedding) was roughly five times the asymmetric onset time. Altogether, the study indicates a transformation in the impulsive wake structure and associated time scales to occur at Re near 1.6 × 105.

Notes

Acknowledgements

The authors thank Daniel Guildenbecher for helpful suggestions during the experimental setup, Paul Farias for assistance with the data acquisition, and Thomas Grasser for hardware design. Finally, the authors gratefully acknowledge the Laboratory Directed Research and Development (LDRD) program for funding the research. This work is supported by Sandia National Laboratories and the United States Department of Energy. Sandia National Laboratories is a multi-mission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525.

Supplementary material

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Supplementary material 4 (AVI 86952 KB)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature (outside the USA) 2018

Authors and Affiliations

  • Justin L. Wagner
    • 1
  • Edward P. DeMauro
    • 1
  • Katya M. Casper
    • 1
  • Steven J. Beresh
    • 1
  • Kyle P. Lynch
    • 1
  • Brian O. Pruett
    • 1
  1. 1.Sandia National LaboratoriesAlbuquerqueUSA

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