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TECHNICAL PAPERS

An Infrared Technique for Evaluating Turbine Airfoil Cooling Designs

[+] Author and Article Information
P. C. Sweeney

Rolls-Royce Allison, Indianapolis, IN 46206

J. F. Rhodes

Allison Advanced Development Company, Indianapolis, IN 46206

J. Turbomach 122(1), 170-177 (Feb 01, 1999) (8 pages) doi:10.1115/1.555438 History: Received February 01, 1999
Copyright © 2000 by ASME
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References

Figures

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Lamilloy® snowflake design
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The flat plate rig uses electrically heated air to simulate the proper free stream-to-coolant temperature ratio
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Specimen preparation involves installing instrumentation and scribing locating marks
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A film of air is used to cool the ZnSe window
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The IR temperature calibration has an uncertainty of less than 4°C
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Increasing free stream-to-coolant temperature difference reduces uncertainty of effectiveness measurement
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Infrared surface temperatures and rig flow conditions are recorded simultaneously
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Calibration checks for each specimen with no cooling flow ensure temperature measurement accuracy (specimen 1 is shown here)
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Lamilloy hole geometry consists of staggered arrays of impingement and film holes.
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A two-dimensional contour plot is useful for associating cooling performance with specific cooling design features
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Spanwise-averaged effectiveness values were independent of averaging width for all specimens tested
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The test matrix yields span-averaged peak effectiveness data at three free stream Reynolds numbers
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Overall effectiveness is independent of ReL when normalized by Stanton number
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A film hole angle of 30 deg improves cooling performance by enhancing hot side film coverage
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(a) Small dot-shaped areas of high effectiveness correspond to film hole locations. (b) Specimen 1 has film hole spacing of S/D=10.5 and injection angle of 90 deg.
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(a) Large dot-shaped areas of high effectiveness correspond to impingement hole locations. (b) Specimen 3 has film hole spacing of S/D=14.8 and injection angle of 90 deg.
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(a) Hole injection angle of 30 deg enhances cooling film build-up. (b) Specimen 2 has film hole spacing of S/D=10.5 and injection single of 30 deg.
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(a) Film coverage from angled holes augments effectiveness of impingement regions immediately downstream of film holes. (b) Specimen 4 has film hole spacing of S/D=14.8 and injection angle of 30 deg.
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Angled holes improve effectiveness by 10 percent for S/D=10.5
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Angled holes produce minimal improvement in effectiveness for S/D=14.8

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