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TECHNICAL PAPERS

# Turbulent Flow Downstream of a Perforated Plate: Sharp-Edged Orifice Versus Finite-Thickness Holes

[+] Author and Article Information
Rui Liu

Mechanical, Automotive & Materials Engineering, University of Windsor, Windsor, ON, N9B 3P4, Canada

David S.-K. Ting1

Mechanical, Automotive & Materials Engineering, University of Windsor, Windsor, ON, N9B 3P4, Canadadting@uwindsor.ca

1

Corresponding author.

J. Fluids Eng 129(9), 1164-1171 (Mar 28, 2007) (8 pages) doi:10.1115/1.2754314 History: Received February 18, 2006; Revised March 28, 2007

## 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.

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## Figures

Figure 1

(a) Close-up view of the orificed perforated plate, (b) cross-sectional view of the OPP, and (c) cross-sectional view of the 25.4mm thick straight-hole perforated plate

Figure 2

Variation of K with the time measured in the coordinate system moving with the mean flow

Figure 3

Variation of Tu with the downstream distance from the perforated plates

Figure 4

Illustration of the flow fields immediately downstream of the leading edges of (a) the orificed perforated plate and (b) the straight hole perforated plate

Figure 5

Variations of dimensionless parameter Lε∕(2K∕3)3∕2 for OPP and SHPP

Figure 6

Verification of L∝A1∕2 relationship at U=10.8m∕s

Figure 7

(a) Streamwise autocorrelation function f(r) at 20D, 60D, and 100D downstream of the OPP at U=10.8m∕s, and (b) streamwise autocorrelation function f(r) at 20D, 60D, and 100D downstream of the SHPP at U=10.8m∕s

Figure 8

(a) Streamwise autocorrelation function f(r) at 60D downstream of the OPP at U=5.8m∕s, 7.8m∕s, and 10.8m∕s, and (b) lateral autocorrelation function g(r) at 60D downstream of the OPP at U=5.8m∕s, 7.8m∕s, and 10.8m∕s

Figure 9

(a) Streamwise autocorrelation function f(r) at 60D downstream of the SHPP at U=5.8m∕s, 7.8m∕s, and 10.8m∕s, and (b) lateral autocorrelation function g(r) at 60D downstream of the SHPP at U=5.8m∕s, 7.8m∕s, and 10.8m∕s

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