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TECHNICAL PAPERS

Flow Downstream of a Cluster of Nine Jets

[+] Author and Article Information
M. Boutazakhti1

Mechanical and Industrial Engineering,  University of Toronto, Toronto, CanadaMohamed.Boutazakhti@utoronto.ca

P. E. Sullivan, M. J. Thomson

Mechanical and Industrial Engineering,  University of Toronto, Toronto, Canada

I. Yimer

Institute for Aerospace Research,  National Research Council, Canada

1

Corresponding author. Presently at: Techint Goodfellow Technologies Inc.

J. Fluids Eng 129(5), 541-550 (Oct 03, 2006) (10 pages) doi:10.1115/1.2720451 History: Received April 05, 2005; Revised October 03, 2006

This work is an experimental investigation of the flow downstream of a low emission nozzle. The nozzle is a 3×3 square matrix of nine small swirling air jets, has a design swirl number of 0.8, and operates at a Reynolds number of 40,000. Particle image velocimetry (PIV) was used to map the velocity field under nonburning and atmospheric conditions for the first 18 jet diameters downstream of the nozzle exit plane. Seeding was liquid injected into the air stream and drops were sized to filter out those larger than 3×3pixels. The results showed that the cluster blends into a single jet-like flow 12 jet diameters downstream with the axial component of the velocity displaying self-similar properties. Lateral jet interaction slows the decay of the axial component of the velocity and jet expansion in the developed region while accelerating the decay of the radial component.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 2

PIV viewing widows

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Figure 3

PIV images of the seeding drops

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Figure 4

Image preprocessing algorithm diagram

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Figure 5

Sample convergence curve for average velocity

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Figure 6

Statistical accuracy, axial velocity

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Figure 7

Comparison of PIV and PDPA Measurements, x3∕D=3

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Figure 8

Exponential decay of centerline axial velocity for the cluster

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Figure 9

Exponential decay of centerline axial velocity for the single jet

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Figure 10

Axial velocity profiles in the merging region of the cluster

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Figure 11

Cluster self-preserving profiles in the developed region

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Figure 12

Single jet axial velocity in the near field

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Figure 13

Single jet axial velocity in the far field

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Figure 14

Radial velocity profiles for the cluster

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Figure 1

Macrolamination nozzle

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