Abstract
High-speed tomographic particle image velocimetry measurements are presented, describing flow development in cylinder wakes at Reynolds numbers from 23,000 to 131,000, generated by shock Mach numbers from 1.0 to 1.3. Experiments are conducted in a shock tube, which creates an impulsive start followed by uniform flow conditions for greater than 8.0 ms. A pulse-burst laser is used for illumination, allowing a measurement volume approximately 10 times larger compared to typical high-speed setups with traditional oil droplet particle seeding in air. Measurements are acquired at 10 kHz, allowing 90 snapshots to be acquired per shock tube shot. Additional advances are made in the data processing: Single-image self-calibration accounts for shock tube recoil and distributed cluster processing allows compilation of a large dataset for statistical analysis. The initial wake development and transition to regular von Kármán shedding in the cylinder wake is shown in terms of the vortex topology, and statistics of vorticity components are shown as a function of time and Reynolds number. Analysis of multiple runs and conditions shows an initially rapid development of spanwise vorticity, followed by development of streamwise/transverse vorticity at a 5–10 times slower rate. The streamwise vorticity peaks at the time of the first shedding cycle, followed by periodic shedding during which counterrotating pairs of streamwise-aligned vortices are prevalent.
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Acknowledgements
The authors thank Steven Beresh for helpful insight 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 US 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 US Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525.
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Lynch, K.P., Wagner, J.L. Pulse-burst tomographic PIV of an impulsively started cylinder wake in a shock tube. Exp Fluids 63, 51 (2022). https://doi.org/10.1007/s00348-022-03398-6
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DOI: https://doi.org/10.1007/s00348-022-03398-6