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TECHNICAL PAPERS

Measured Adiabatic Effectiveness and Heat Transfer for Blowing From the Tip of a Turbine Blade

[+] Author and Article Information
J. R. Christophel, E. Couch, K. A. Thole

Mechanical Engineering Department, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061

F. J. Cunha

Turbine Durability, Pratt & Whitney Aircraft Company, United Technologies Corporation, East Hartford, CT 06108

J. Turbomach 127(2), 251-262 (May 05, 2005) (12 pages) doi:10.1115/1.1811095 History: Received October 01, 2003; Revised March 01, 2004; Online May 05, 2005
Copyright © 2005 by ASME
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References

Figures

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Schematic of the wind tunnel facility used for the testing of the blade tips
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The corner test section of the wind tunnel housed three blades that formed two full passages
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Area-averaged NHFR for both gap heights
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NHFR taken along the Camber line for the (a) small and (b) large gap heights
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Contour plots of NHFR for the small (top) and large (bottom) gap heights at all blowing ratios
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Area-averaged heat transfer augmentation for the small and large tip gaps
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CFD predictions of dirt purge streamlines for the large tip gap 21
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Camber line data for hf/h0 for the (a) small and (b) large tip gaps
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Baseline Nusselt number contour plots for the (a) small and (b) large tip gap heights
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Comparison of experimental data to a fully developed correlation
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Area-averaged effectiveness of the tip at various coolant blowing levels
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Adiabatic effectiveness contours taken along the tip with dirt purge blowing for the large tip gap
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Measured and predicted static pressures at the blade midspan
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The blade tip included a plenum that supplied coolant to the dirt purge holes
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Effectiveness taken along the blade camber line for the (a) small and (b) large tip gaps
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Definition of the blade camber line
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Adiabatic effectiveness contours taken along the tip with dirt purge blowing for the small tip gap
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Main tip heat transfer surface showing (a) serpentine passages and (b) detail of main tip heater as placed on the blade surface

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