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A parametric study of rectangular jets issuing into a laminar crossflow

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Abstract

Rectangular orifice steady jets impinging into a laminar crossflow are experimentally studied using particle image velocimetry. Jets with multiple orifice geometries, including orifice orientation, aspect ratio, and jet velocities were tested. We primarily focus on the (1) jet vortex structure and velocity field characterization, (2) theoretical scaling arguments, and (3) flow separation control implications. We find that orifice orientation specifically has a dramatic impact on the vortex production/organization and downstream flow field, where the aspect ratio and blowing ratio merely changed the strength and size of the flow structures. For the wall-normal jet, we make theoretical scaling arguments. The jet trajectory behavior could be collapsed using previously published circular steady jet strategies, which normalize the wall-normal and streamwise coordinate by the ratio of the jet to crossflow momentum. It was shown that the added streamwise vorticity could be sufficiently described by normalizing the vorticity field by the theoretical Blasius boundary layer vorticity at the orifice edges during jet formation. Finally, by analyzing the added momentum within the boundary layer and added enstrophy (a conduit for mixing), we discuss separation control effectiveness implications. It is shown that certain jet geometries and orientations may be the best for separation control through added boundary layer momentum and large-scale mixing, depending on the flow scenario.

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Funding

This work was not supported by any external funding.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Delaware, Newark, DE, 19716, USA

    Frank A. Tricouros & Tyler Van Buren

  2. Department of Mechanical, Aeronautical, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA

    Michael Amitay

Authors
  1. Frank A. Tricouros
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  2. Michael Amitay
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  3. Tyler Van Buren
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Contributions

FAT: data curation, formal analysis, investigation, software, supervision, validation, writing-original draft, writing-review and editing; MA: conceptualization, funding acquisition, supervision, review, and editing; TVB: conceptualization, data curation, formal analysis, funding acquisition, investigation, methodology, project administration, resources, software, supervision, validation, visualization, writing-original draft, writing-review and editing.

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Correspondence to Frank A. Tricouros.

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Tricouros, F.A., Amitay, M. & Van Buren, T. A parametric study of rectangular jets issuing into a laminar crossflow. Exp Fluids 64, 123 (2023). https://doi.org/10.1007/s00348-023-03662-3

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  • DOI: https://doi.org/10.1007/s00348-023-03662-3

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