Title

Turbulent flow downstream of a perforated plate: Sharp-edged orifice versus finite-thickness holes

Document Type

Article

Publication Date

9-1-2007

Publication Title

Journal of Fluids Engineering, Transactions of the ASME

Volume

129

Issue

9

First Page

1164

Last Page

1171

Abstract

In this study, perforated plates with sharp-edged orificed openings and finite-thickness straight openings were applied to produce nearly isotropic turbulence in a wind tunnel. At the same nominal velocity, the orificed perforated plate was able to produce a higher level of turbulence due to the well-defined flow separation from its sharp edge openings. The integral length, L was found to be related to the square root of the turbulence decay coefficient in the power law decay of turbulence kinetic energy, A. The larger A associated with the orificed perforated plate gave rise to a larger L. The corresponding streamwise autocorrelation functions for the two perforated plates behaved differently, confirming the quantitative disparity in L and further indicates some qualitative difference in the large-scale structures generated. Copyright © 2007 by ASME.

DOI

10.1115/1.2754314

ISSN

00982202

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