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TECHNICAL PAPERS

Adiabatic Effectiveness Measurements of Endwall Film-Cooling for a First-Stage Vane

[+] Author and Article Information
D. G. Knost, K. A. Thole

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

J. Turbomach 127(2), 297-305 (May 05, 2005) (9 pages) doi:10.1115/1.1811099 History: Received October 01, 2003; Revised March 01, 2004; Online May 05, 2005
Copyright © 2005 by ASME
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Figures

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The two film-cooling patterns that were simulated in this study with iso–velocity contours (U/Uinlet) and injection direction for the cooling holes
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(a) Illustration of wind tunnel facility, (b) cooling supply for slot and film cooling holes
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Film-cooling holes for (a) Passage 1 and (b) the leading edge region
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Contours of adiabatic effectiveness for the baseline film-cooling only cases: (a) pattern 1, 0.5% coolant (b) pattern #1, 0.75% coolant, (c) pattern #2, 0.5% coolant, and (d) pattern 2, 0.75% coolant
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Contours of the difference between the predicted flow angles at 2% span and midspan are shown for the high 0.75% slot flow case. The hole locations of pattern 1 are shown for reference.
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Predicted streamlines at 2% span for both the 0.5% and 1.0% slot flow rates. The hole locations of pattern 1 are shown for reference.
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Predicted streamlines at 2% span for 0.5% slot flow without film cooling are superimposed on measured effectiveness levels for (a) pattern 1 with 0.5% slot flow and 0.5% film cooling and (b) pattern 2 with 0.5% slot flow and 0.5% film cooling
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Predicted streamlines at 2% span for 1% slot without film cooling superimposed for (a) pattern 1 with 0.75% slot flow and 0.5% film cooling, and (b) pattern 2 with 0.75% slot flow and 0.5% film cooling
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Area-averaged effectiveness levels for a range of coolant flow rates (percentage is based on total passage flow)
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Momentum flux ratios for holes indicated by the dashed lines are shown in (a) leading edge, (b) pressure side upstream, and (c) pressure side downstream regions. Hole locations are shown to the right

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