This paper deals with an experimental investigation of aerodynamic characteristics of full and partial-length squealer rims in a turbine stage. Full and partial-length squealer rims are investigated separately on the pressure side and on the suction side in the “Axial Flow Turbine Research Facility” (AFTRF) of the Pennsylvania State University. The streamwise length of these “partial squealer tips” and their chordwise position are varied to find an optimal aerodynamic tip configuration. The optimal configuration in this cold turbine study is defined as the one that is minimizing the stage exit total pressure defect in the tip vortex dominated zone. A new “channel arrangement” diverting some of the leakage flow into the trailing edge zone is also studied. Current results indicate that the use of “partial squealer rims” in axial flow turbines can positively affect the local aerodynamic field by weakening the tip leakage vortex. Results also show that the suction side partial squealers are aerodynamically superior to the pressure side squealers and the channel arrangement. The suction side partial squealers are capable of reducing the stage exit total pressure defect associated with the tip leakage flow to a significant degree.
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e-mail: cxc11@psu.edu
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January 2005
Technical Papers
Aerodynamics of Tip Leakage Flows Near Partial Squealer Rims in an Axial Flow Turbine Stage
Cengiz Camci, Professor of Aerospace Engineering,
e-mail: cxc11@psu.edu
Cengiz Camci, Professor of Aerospace Engineering
Turbomachinery Heat Transfer Laboratory, Department of Aerospace Engineering, The Pennsylvania State University, 223 Hammond Building, University Park, PA 16802
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Debashis Dey, Research Assistant,
Debashis Dey, Research Assistant
Turbomachinery Heat Transfer Laboratory, Department of Aerospace Engineering, The Pennsylvania State University, 223 Hammond Building, University Park, PA 16802
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Levent Kavurmacioglu, Visiting Professor
Levent Kavurmacioglu, Visiting Professor
Turbomachinery Heat Transfer Laboratory, Department of Aerospace Engineering, The Pennsylvania State University, 223 Hammond Building, University Park, PA 16802
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Cengiz Camci, Professor of Aerospace Engineering
Turbomachinery Heat Transfer Laboratory, Department of Aerospace Engineering, The Pennsylvania State University, 223 Hammond Building, University Park, PA 16802
e-mail: cxc11@psu.edu
Debashis Dey, Research Assistant
Turbomachinery Heat Transfer Laboratory, Department of Aerospace Engineering, The Pennsylvania State University, 223 Hammond Building, University Park, PA 16802
Levent Kavurmacioglu, Visiting Professor
Turbomachinery Heat Transfer Laboratory, Department of Aerospace Engineering, The Pennsylvania State University, 223 Hammond Building, University Park, PA 16802
Contributed by the International Gas Turbine Institute and presented at the International Gas Turbine and Aeroengine Congress and Exhibition, Atlanta, GA, June 16–19, 2003. Manuscript received by the IGTI Dec. 2002; final revision Mar. 2003. Paper No. 2003-GT-38979. Review Chair: H. R. Simmons.
J. Turbomach. Jan 2005, 127(1): 14-24 (11 pages)
Published Online: February 9, 2005
Article history
Received:
December 1, 2002
Revised:
March 1, 2003
Online:
February 9, 2005
Citation
Camci, C., Dey, D., and Kavurmacioglu, L. (February 9, 2005). "Aerodynamics of Tip Leakage Flows Near Partial Squealer Rims in an Axial Flow Turbine Stage ." ASME. J. Turbomach. January 2005; 127(1): 14–24. https://doi.org/10.1115/1.1791279
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