Cooling the Tip of a Turbine Blade Using Pressure Side Holes—Part II: Heat Transfer Measurements

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

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

F. J. Cunha

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

J. Turbomach 127(2), 278-286 (May 05, 2005) (9 pages) doi:10.1115/1.1811096 History: Received October 01, 2003; Revised March 01, 2004; Online May 05, 2005
Copyright © 2005 by ASME
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Test section viewed from top showing adjustment capabilities and infrared windows
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Tip geometries tested: (a) the baseline geometry (filled-in dirt purge holes) and (b),(c) approximate hole geometry with the dirt purge holes
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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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Comparison of experimental data to a fully developed correlation
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Comparison of experimental data to the proposed augmentation factor
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Baseline Nusselt number contour plots for the (a) small and (b) large tip gap
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Nusselt number line plots for the baseline
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Line plots at lines 0 and 3 for baseline cases
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(a)–(c) Line plots for the cooling holes at positions 1, 2, and 3
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Heat transfer augmentation at the camber line for the (a) small and (b) large tip gaps
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Area-averaged heat transfer augmentation for the entire blade tip
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Pressure side plots of NHFR for the small tip gap
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NHFR for all cases at 0.58% and 1% coolant flow
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(a)–(c) Individual line plots of NHFR at different locations along the blade tip
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NHFR levels for camber lines for (a) small and (b) large tip gap settings
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Area-averaged NHFR for full blade tip and for the downstream 70% of tip



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