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TECHNICAL PAPERS

Cooling the Tip of a Turbine Blade Using Pressure Side Holes—Part I: Adiabatic Effectiveness Measurements

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

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

F. J. Cunha

Pratt & Whitney, United Technologies Corporation, East Hartford, Connecticut 06108

J. Turbomach 127(2), 270-277 (May 05, 2005) (8 pages) doi:10.1115/1.1812320 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 showing the approximate hole placement for the tip model
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Photo of SLA/foam model for the dirt purge and cooling holes
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Schematic of (a) wind tunnel facility and (b) test section for the blade tips
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Predicted and measured static pressure distributions for the large and small tip gap cases
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Discharge coefficients that were measured for the cooling holes, dirt purge holes, and TEF
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Local mass flux ratios for each of cooling holes placed on the pressure side of the blade
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Percent difference between computational and experimental flow rates at 0.68% coolant flow
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Location and description of line data taken along blade tip
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Measured adiabatic effectiveness levels on the tip for the small tip gap
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Predicted path lines for the 0.58% coolant flow at the small tip gap
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Data taken along the camber line for the small tip gap at two blowing ratios
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Measured adiabatic effectiveness levels for the large tip gap
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Data taken along the camber line for the large tip gap
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(a)–(c) Line data for the different cases
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Area-averages for (a) the entire blade tip and (b) the downstream 70% of blade
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Effectiveness contours with no dirt purge blowing with 0.07% coolant flow for the large tip gap

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