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Flow visualization of interactions among large coherent structures in an axisymmetric jet

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Abstract

Interactions between large coherent structures are visualized with both schlieren photography in two air jets and dye photography in a water jet. The density difference needed for the schlieren technique is provided by an electrically heated wire ring surrounding the jet. External forcing with either single axisymmetric, single non-symmetric, combined axisymmetric or combined non-symmetric modes was applied. It was found that forcing the jet with a pair of different spinning modes leads to azimuthal distortions of the mean flow. This observation confirms and explains existing hotwire data. Simultaneous excitation with two axisymmetric modes may produce structures of higher modes or even cause structurally undistinguishable development. Streamwise structures are observed both in the unforced jet and in the axisymmetrically forced jet. They do not seem to be caused by a Görtier instability from the concave curvature of the conventional nozzle, since they were also found in a jet flow from a specially designed nozzle with only convex contraction surface.

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Author notes

  1. C. O. Paschereit & H. E. Fiedler

    Present address: Hermann-Föttinger-Institut für Thermo- und Fluiddynamik, Technische Universität Berlin, Berlin, Germany

  2. D. Oster

    Present address: Israel Aircraft Industries, Ben Gurion Airport, Israel

Authors and Affiliations

  1. Aerospace and Mechanical Engineering Department, University of Arizona, 85721, Tucson, AZ, USA

    C. O. Paschereit, D. Oster, T. A. Long, H. E. Fiedler & I. Wygnanski

Authors
  1. C. O. Paschereit
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  2. D. Oster
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  3. T. A. Long
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  4. H. E. Fiedler
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  5. I. Wygnanski
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Additional information

Supported in part by the National Science Foundation under Grant No. MSM 8900086 and by the Deutsche Forschungsgemeinschaft DFG, Fi178/34-1

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Paschereit, C.O., Oster, D., Long, T.A. et al. Flow visualization of interactions among large coherent structures in an axisymmetric jet. Experiments in Fluids 12, 189–199 (1992). https://doi.org/10.1007/BF00188258

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  • DOI: https://doi.org/10.1007/BF00188258

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