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Asymmetric vortex shedding in the wake of an abruptly expanding annular jet

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Abstract

In this paper, the structure of the turbulent wake behind the inner tube of a suddenly expanding annular jet flow is studied. The flow field is measured using tomographic particle image velocimetry and analyzed using proper orthogonal decomposition (POD). It was found that both the instantaneous and time-averaged central wakes behind the inner pipe are highly asymmetric despite the axisymmetric structure of the geometry. This asymmetry is the result of a bifurcation at low Reynolds numbers which persists up to the turbulent regime. The asymmetry induces a pair of counter-rotating vortices in the jet which are aligned with the main flow direction. Moreover, the asymmetry also induces a highly dynamical flow field. Analyzing the flow structures using POD shows that the wake oscillates around the asymmetric equilibrium position at a very low Strouhal number in the order of 0.01. On top of this motion, the inner shear layer oscillates with Strouhal numbers in the range of 0.1-0.3. This oscillation causes an asymmetric shedding of vortices of the hairpin type in the inner shear layer. As such, a local asymmetric region of very intensive mixing is induced near the stagnation point.

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Acknowledgements

The corresponding author wishes to thank the FWO Flanders and the J.M. Burgerscentrum for fluid mechanics for financially supporting his stay to perform the measurements at the water tank facility at Delft University of Technology (TU Delft).

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Authors and Affiliations

  1. Department of Mechanical Engineering, KU Leuven, Leuven, Belgium

    Maarten Vanierschot

  2. Department of Aerospace Engineering, Middle East Technical University, Ankara, Turkey

    Mustafa Percin

  3. Department of Aerospace Engineering, Delft University of Technology, Delft, the Netherlands

    Bas W. van Oudheusden

Authors
  1. Maarten Vanierschot
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  2. Mustafa Percin
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  3. Bas W. van Oudheusden
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Correspondence to Maarten Vanierschot.

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Vanierschot, M., Percin, M. & van Oudheusden, B.W. Asymmetric vortex shedding in the wake of an abruptly expanding annular jet. Exp Fluids 62, 77 (2021). https://doi.org/10.1007/s00348-021-03177-9

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  • DOI: https://doi.org/10.1007/s00348-021-03177-9

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