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TECHNICAL PAPERS

Aerodynamics of Tip Leakage Flows Near Partial Squealer Rims in an Axial Flow Turbine Stage

[+] Author and Article Information
Cengiz Camci, Debashis Dey, Levent Kavurmacioglu

Turbomachinery Heat Transfer Laboratory, Department of Aerospace Engineering, The Pennsylvania State University, 223 Hammond Building, University Park, PA 16802

J. Turbomach 127(1), 14-24 (Feb 09, 2005) (11 pages) doi:10.1115/1.1791279 History: Received December 01, 2002; Revised March 01, 2003; Online February 09, 2005
Copyright © 2004 by ASME
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References

Heyes,  F. J. G., and Hodson,  H. P., 1993, “Measurement and Prediction of Tip Clearance Flow in Linear Turbine Cascades,” ASME J. Turbomach., 115, pp. 376–382.
Sjolander, S. A., and Cao, D., 1994, “Measurements of the Flow in an Idealized Turbine Gap,” ASME paper 94-GT-74.
Morphis, G., and Bindon, J. P., 1988, “The Effects of Relative Motion, Blade Edge Radius and Gap Size on the Blade Tip Distribution in an Annular Turbine Cascade With Tip Clearance,” ASME paper 88-GT-256.
Azad, Gm. S., Han, J. C., Teng, S., and Boyle, R. J., 2000, “Heat Transfer and Pressure Distributions on a Gas Turbine Blade Tip,” ASME paper 2000-GT-194.
Dey, D., and Camci, C., 2001, “Aerodynamic Tip De-Sensitization of an Axial Turbine Rotor Using Tip Platform Extensions,” ASME paper 2001-GT-484.
Anderson, R. H., 1979, “Tip Cooling for Turbine Blades,” U.S. Patent #4,142,824, March 6, 1979.
Azad, Gm. S., Han, J. C., and Boyle, R. J., 2000, “Heat Transfer and Flow on the Squealer Tip of a Gas Turbine Blade,” ASME paper 2000-GT-195.
Heyes,  F. J. G., Hodson,  H. P., and Dailey,  G. M., 1992, “The Effect of Blade Tip Geometry on the Tip Leakage Flow in Axial Turbine Cascades,” ASME J. Turbomach., 114, pp. 643–651.
Bunker, R. S., and Bailey, J. C., 2000, “Blade Tip Heat Transfer and Flow With Chordwise Sealing Strips,” International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC), Honolulu, Hawaii, pp. 548–555.
Ameri,  A. A., 2001, “Heat Transfer and Flow on the Blade Tip of a Gas Turbine Equipped With a Mean Camber-Line Strip,” ASME J. Turbomach., 123, pp. 704–708.
Ameri, A. A., Steinthorsson, E., and Rigby, L. D., “Effects of Squealer Tip on Rotor Heat Transfer and Efficiency,” ASME paper 1997-GT-128.
Azad, Gm. S., Han, J. C., Bunker, R. S., and Lee, C. P., 2001, “Effect of Squealer Geometry Arrangement on Gas Turbine Blade Tip Heat Transfer,” ASME/IMECE 2001/HTD-24314, HTD-Vol. 369-5, pp. 297–305.
Lakshminarayana, B., Camci, C., Halliwell, I., and Zaccaria, M., 1992, “Investigation of Three Dimensional Flow Field in a Turbine Including Rotor/Stator Interaction. Part I: Design Development and Performance of the Research Facility,” AIAA paper 92-3326, presented at the ASME-AIAA Joint Prop. Conf., Nashville, Tennessee.
Dey, D., 2001, “Aerodynamic Tip Desensitization in Axial Flow Turbines,” Ph.D. Thesis, 2001, The Pennsylvania State University.
Zaccaria,  M., and Lakshminarayana,  B., 1995, “Investigation of Three Dimensional Flow Field at the Exit of a Turbine Nozzle,” J. Propul. Power, 11(1), pp. 55–63.
Ristic, D., Lakshminarayana, B., and Chu, S., 1998, “Three-Dimensional Flow Field Downstream of an Axial Flow Turbine Rotor,” AIAA paper 98-3572, presented at the 34th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, Cleveland, Ohio.
Yamamoto,  A., 1989, “Endwall Flow/Loss Mechanisms in a Linear Turbine Cascade With Blade Tip Clearance,” ASME J. Turbomach., 111, pp. 264–275.
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Figures

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Axial Flow Turbine Research Facility AFTRF of the Pennsylvania State University
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Geometry of the suction side squealer tip, s=0.38 mm and 0.76 mm (t-s)/h=1.03% and 0.72%
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Geometry of channel type squealer tip, s=0.76 mm (t-s)/h=0.72%
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Axial, tangential and radial velocity components at AFTRF rotor inlet plane (measured and design values) 15
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Measured secondary flow patterns at AFTRF rotor exit plane without squealer rims. The observer is looking into the flow at rotor exit plane 16. (Blade rotation is in CCW direction.)
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Measured and predicted static pressure on the rotor tip platform of AFTRF 18
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Po/Pin contours for two gaps, SSSq-A (the shortest squealer rim)
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Po/Pin contours for two tip gaps, SSSq-B (middle length squealer rim)
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Po/Pin contours for two gaps, SSSq-C (the longest squealer rim)
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Plots of Po/Pin for s=0.38 mm SSSq-B and full cover
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Plots of Po/Pin for s=0.76 mm SSSq-B and full cover
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A representation of flow field near a partial squealer tip on the suction side
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Plots of Po/Pin for three s=0.38 mm SSSq configurations (r/h=89.7% and 79.3%)
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Plots of Po/Pin for three s=0.76 mm SSSq configurations (r/h=94.8% and 92.2%)
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Plots of Po/Pin for three s=0.76 mm SSSq configurations (r/h=89.7% and 79.3%)
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Streamlines near partial squealer rims located at the suction side
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Po/Pin contours of channel configurations, SqCh-A and SqCh-B, s=0.76 mm
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Comparison of the two squealer channels with the partial squealer rim (SSSq-B) on the suction side, s=0.76 mm

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