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The Development of the Turbulent Three-Dimensional Wall Jet With and Without a Grid Placed Over the Outlet

[+] Author Affiliations
Sébastien Després

Rally Engineering, Fredericton, NB, Canada

Joseph W. Hall

University of New Brunswick, Fredericton, NB, Canada

Paper No. IMECE2014-38402, pp. V007T09A027; 10 pages
doi:10.1115/IMECE2014-38402
From:
  • ASME 2014 International Mechanical Engineering Congress and Exposition
  • Volume 7: Fluids Engineering Systems and Technologies
  • Montreal, Quebec, Canada, November 14–20, 2014
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4954-5
  • Copyright © 2014 by ASME

abstract

The three-dimensional turbulent wall jet has a lateral half-width that is 5 to 8 times greater than its vertical half-height. This has been previously attributed to strong turbulence generated secondary flow caused by the passage of coherent vortex-ring structures formed at the nozzle exit. In order to assess whether the large lateral growth of the jet is tied to these structures, a grid was placed at the nozzle exit to disrupt the shear-layer that produces the vortex rings at the outlet. Here, the jet was formed using a 0.038m round contoured nozzle with an exit Reynolds number of 108,000. The grid has a mesh wire size of 0.2mm with an opening of 1mm giving it a solidity ratio of 0.4. Measurements of the jet with and without the grid were taken using hot-wire anemometry and stereoscopic Particle Image Velocimetry (PIV). The results indicate that the grid delays the lateral growth of the jet and increases its vertical growth. By x/D=40 though, these differences were minimal. The presence of the grid also decreased the mass entrainment and mixing associated with the jet at each downstream location investigated.

Copyright © 2014 by ASME
Topics: Turbulence

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