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Research Papers: Flows in Complex Systems

Axial Flow Fan Tip Leakage Flow Control Using Tip Platform Extensions

[+] Author and Article Information
Ali Aktürk

Department of Aerospace Engineering, Turbomachinery Aero-Heat Transfer Laboratory, Pennsylvania State University, University Park, PA 16802aua162@psu.edu

Cengiz Camci1

Department of Aerospace Engineering, Turbomachinery Aero-Heat Transfer Laboratory, Pennsylvania State University, University Park, PA 16802cxc11@psu.edu

1

Corresponding author.

J. Fluids Eng 132(5), 051109 (May 14, 2010) (10 pages) doi:10.1115/1.4001540 History: Received July 17, 2009; Revised February 20, 2010; Published May 14, 2010; Online May 14, 2010

Performance of an axial flow fan unit is closely related to its tip leakage mass flow rate and level of tip/casing interactions. The present experimental study uses a stereoscopic particle image velocimeter to quantify the three dimensional mean flow observed near the blade tip, just downstream of a ducted fan unit. After a comprehensive description of the exit flow from the baseline fan, a number of novel tip treatments based on custom designed pressure side extensions are introduced. Various tip leakage mitigation schemes are introduced by varying the chordwise location and the width of the extension in the circumferential direction. The current study shows a proper selection of the pressure side bump location and width are the two critical parameters influencing the success of each tip leakage mitigation approach. Significant gains in the axial mean velocity component are observed when a proper pressure side tip extension is used. It is also observed that a proper tip leakage mitigation scheme significantly reduces the tangential velocity component near the tip of the axial fan blade. Reduced tip clearance related flow interactions are essential in improving the energy efficiency of ducted fan systems. A reduction or elimination of the momentum deficit in tip vortices is also essential to reduce the adverse performance effects originating from the unsteady and highly turbulent tip leakage flows rotating against a stationary casing.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 9

Velocity profiles measured at location 3 (340 m3/min, 32 Pa)

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Figure 10

Velocity profiles measured at location 4 (340 m3/min, 32 Pa)

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Figure 11

Velocity profiles measured at location 5 (340 m3/min, 32 Pa)

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Figure 12

Velocity profiles measured at location 3 (high ΔP with 19.6% perforated plate, 80 m3/min, 140 Pa)

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Figure 13

Total velocity contour and streamlines at location 3 for baseline profile (340 m3/min, 32 Pa)

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Figure 14

Total velocity contour and streamlines at location 3 for the 2nd profile (340 m3/min, 32 Pa)

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Figure 8

Velocity profiles measured at location 3 for two different tip clearances

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Figure 7

Novel tip platform extensions for tip leakage mitigation

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Figure 6

Influence of the sample size on SPIV ensemble averaging

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Figure 5

SPIV measurement plane (horizontal) downstream of the rotor exit and the coordinate system

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Figure 4

Axial flow fan performance

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Figure 3

Geometric and blade section parameters of the axial flow fan

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Figure 2

Axial flow fan as seen from the exit plane and the SPIV system orientation

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Figure 1

Test rig and stereoscopic SPIV setup

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Figure 15

Flow coefficient calculated at location 3 (340 m3/min, 32 Pa)

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