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Time resolved flow-field measurements of a turbulent mixing layer over a rectangular cavity

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Abstract

High Reynolds number, low Mach number, turbulent shear flow past a rectangular, shallow cavity has been experimentally investigated with the use of dual-camera cinematographic particle image velocimetry (CPIV). The CPIV had a 3 kHz sampling rate, which was sufficient to monitor the time evolution of large-scale vortices as they formed, evolved downstream and impinged on the downstream cavity wall. The time-averaged flow properties (velocity and vorticity fields, streamwise velocity profiles and momentum and vorticity thickness) were in agreement with previous cavity flow studies under similar operating conditions. The time-resolved results show that the separated shear layer quickly rolled-up and formed eddies immediately downstream of the separation point. The vortices convect downstream at approximately half the free-stream speed. Vorticity strength intermittency as the structures approach the downstream edge suggests an increase in the three-dimensionality of the flow. Time-resolved correlations reveal that the in-plane coherence of the vortices decays within 2–3 structure diameters, and quasi-periodic flow features are present with a vortex passage frequency of ~1 kHz. The power spectra of the vertical velocity fluctuations within the shear layer revealed a peak at a non-dimensional frequency corresponding to that predicted using linear, inviscid instability theory.

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Acknowledgments

This work was partially supported by the National Science Foundation under project number NSF-CTM-02-03140.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI, 48109, USA

    Shiyao Bian & Steven L. Ceccio

  2. Department of Aerospace Engineering, University of Michigan, Ann Arbor, MI, 48109, USA

    James F. Driscoll

  3. Applied Research Laboratory, Pennsylvania State University, State College, PA, 16804, USA

    Brian R. Elbing

Authors
  1. Shiyao Bian
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  2. James F. Driscoll
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  3. Brian R. Elbing
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  4. Steven L. Ceccio
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Correspondence to Shiyao Bian.

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Bian, S., Driscoll, J.F., Elbing, B.R. et al. Time resolved flow-field measurements of a turbulent mixing layer over a rectangular cavity. Exp Fluids 51, 51–63 (2011). https://doi.org/10.1007/s00348-010-1025-7

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  • DOI: https://doi.org/10.1007/s00348-010-1025-7

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