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.
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Axial Flow Fan Tip Leakage Flow Control Using Tip Platform Extensions
Ali Aktürk,
Ali Aktürk
Graduate Research Assistant
Department of Aerospace Engineering, Turbomachinery Aero-Heat Transfer Laboratory,
e-mail: aua162@psu.edu
Pennsylvania State University
, University Park, PA 16802
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Cengiz Camci
Cengiz Camci
Professor
Department of Aerospace Engineering, Turbomachinery Aero-Heat Transfer Laboratory,
e-mail: cxc11@psu.edu
Pennsylvania State University
, University Park, PA 16802
Search for other works by this author on:
Ali Aktürk
Graduate Research Assistant
Department of Aerospace Engineering, Turbomachinery Aero-Heat Transfer Laboratory,
Pennsylvania State University
, University Park, PA 16802e-mail: aua162@psu.edu
Cengiz Camci
Professor
Department of Aerospace Engineering, Turbomachinery Aero-Heat Transfer Laboratory,
Pennsylvania State University
, University Park, PA 16802e-mail: cxc11@psu.edu
J. Fluids Eng. May 2010, 132(5): 051109 (10 pages)
Published Online: May 14, 2010
Article history
Received:
July 17, 2009
Revised:
February 20, 2010
Online:
May 14, 2010
Published:
May 14, 2010
Citation
Aktürk, A., and Camci, C. (May 14, 2010). "Axial Flow Fan Tip Leakage Flow Control Using Tip Platform Extensions." ASME. J. Fluids Eng. May 2010; 132(5): 051109. https://doi.org/10.1115/1.4001540
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