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Comparison of Turbine Tip Leakage Flow for Flat Tip and Squealer Tip Geometries at High

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turbine comparison flo leakage

The tip leakage flow characteristics for flat and squealer turbine tip geometries are studied in the von Karman Institute Isentropic Light Piston Compression Tube facility, CT-2, at different Reynolds and Mach number conditions for a fixed value of the tip gap in a nonrotating, linear cascade arrangement. To the best knowledge of the authors, these are among the very few high-speed tip flow data for the flat tip and squealer tip geometries. Oil flow visualizations and static pressure measurements on the blade tip, blade surface, and corresponding endwall provide insight to the structure of the two different tip flows. Aerodynamic losses are measured for the different tip arrangements, also. The squealer tip provides a significant decrease in velocity through the tip gap with respect to the flat tip blade. For the flat tip, an increase in Reynolds number causes an increase in tip velocity levels, but the squealer tip is relatively insensitive to changes in Reynolds number.

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Copyright © 2006 by American Society of Mechanical Engineers

Topics: Pressure , Flow (Dynamics) , Suction , Blades , Leakage flows , Turbines , Reynolds number

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References

1

Mayle, R. E., and Metzger, D. E., 1982, “Heat Transfer at the Tip of an Unshrouded Turbine Blade,” Proceedings, 7th International Heat Transfer Conference , Hemisphere Publishing Corp., pp. 87–92.

2

Metzger, D. E., Bunker, R. S., and Chyu, M. K., 1989, “Cavity Heat Transfer on a Transverse Grooved Wall in a Narrow Flow Channel,” ASME J. Heat Transfer, 111 , pp. 73–79.

3

Bunker, R. S., 2004, “Turbine Blade Tip Design and Tip Clearance Treatment,” VKI LS 2004–02 on "Blade Tip Heat Transfer and Coolong Techniques".

4

Sjolander, S. A., and Cao, D., 1995, “Measurements of the Flow in an Idealized Turbine Tip Gap,” ASME J. Turbomach., 117 , pp. 578–584.

5

Azad, G. S., Han, J., Teng, S., and Boyle, R. J., 2000, “Heat Transfer and Pressure Distributions on a Gas Turbine Blade Tip,” ASME J. Turbomach.  [CrossRef], 122 , pp. 717–724.

6

Yang, H., Acharya, S., Ekkad, S. V., Prakash, C., and Bunker, R., 2002, “Flow and Heat Transfer Predictions for a Flat-Tip Turbine Blade,” ASME Paper No. GT-2002–30190.

7

Bunker, R. S., Bailey, J. C., and Ameri, A. A., 2000, “Heat Transfer and Flow on the First-Stage Blade Tip of a Power Generation Gas Turbine: Part 1—Experimental Results,” ASME J. Turbomach.  [CrossRef], 122 , pp. 263–271.

8

Ameri, A. A., 2001, “Heat Transfer and Flow on the Blade Tip of a Gas Turbine Equipped with a Mean-Camberline Strip,” ASME J. Turbomach.  [CrossRef], 123 , pp. 704–708.

9

Papa, M., Goldstein, R. J., and Gori, F., 2002, “Effects of Tip Geometry and Tip Clearance on the Mass/Heat Transfer from a Large-Scale Gas Turbine Blade,” ASME Paper No. GT-2002-30192.

10

Azad, G. S., Han, J., and Boyle, R. J., 2000, “Heat Transfer and Flow on the Squealer Tip of a Gas Turbine Blade,” ASME J. Turbomach.  [CrossRef], 122 , pp. 725–732.

11

Yang, H., Acharya, S., Ekkad, S. V., Prakash, C., and Bunker, R., 2002, “Numerical Simulation of Flow and Heat Transfer Past a Turbine Blade with a Squealer-Tip,” ASME Paper No. GT-2002-30193.

12

Jin, P., and Goldstein, R. J., 2002, “Local Mass/Heat Transfer on Turbine Blade Near-Tip Surfaces,” ASME Paper No. GT-2002-30556.

13

Polanka, M. D., Hoying, D. A., Meininger, M., and MacArthur, C. D., 2002, “Turbine Tip and Shroud Heat Transfer and Loading Part A: Parameter Effects including Reynolds Number, Pressure Ratio, and Gas to Metal Temperature Ratio,” ASME Paper No. GT-2002-30186.

14

Arts, T., and Lambert de Rouvroit, M., 1992, “Aerothermal Performance of a Two-Dimensional Highly Loaded Transonic Turbine Nozzle Guide Vane: A Test Case for Inviscid and Viscous Flow Computation,” ASME J. Turbomach., 114 , pp. 147–154.

15

Denos, R., Arts, T., Paniagua, G., Michelassi, V., and Martelli, F., 2001, “Investigation of the Unsteady Rotor Aerodynamics in a Transonic Turbine Stage,” ASME J. Turbomach.  [CrossRef], 123 , pp. 81–89.

16

Ameri, A. A., and Bunker, R. S., 2000, “Heat Transfer and Flow on the First-Stage Blade Tip of a Power Generation Gas Turbine: Part 2—Simulation Results,” ASME J. Turbomach.  [CrossRef], 122 , pp. 272–277.

17

Paniagua, G., and Denos, R., 2002, “Digital Compensation of Pressure Sensors in the Time Domain,” Exp. Fluids, 32 , pp. 417–424.

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Instrumented blade

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Instrumented blade

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