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TECHNICAL PAPERS

Influence of Surface Roughness on Heat Transfer and Effectiveness for a Fully Film Cooled Nozzle Guide Vane Measured by Wide Band Liquid Crystals and Direct Heat Flux Gages

[+] Author and Article Information
S. M. Guo, C. C. Lai, T. V. Jones, M. L. G. Oldfield

Department of Engineering Science, University of Oxford, Oxford, England

G. D. Lock

Department of Mechanical Engineering, University of Bath, Bath, England

A. J. Rawlinson

Rolls-Royce plc, Derby, England

J. Turbomach 122(4), 709-716 (Feb 01, 2000) (8 pages) doi:10.1115/1.1312798 History: Received February 01, 2000
Copyright © 2000 by ASME
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References

Figures

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Roughness Reynolds number along NGV midspan
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(a) Midspan cross section of a CHTT NGV and film cooling geometry, illustrating row positions and two-cavity construction. Holes marked (F) are fan-shaped in the fan-shaped geometry. (b) Close-up view of the fan-shaped holes.
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(a) Schematic diagram of DHFG; (b) combined TLC and DHFG
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Temperature history of DHFG and mainstream
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Heat flux calculated using accurate (Eqs. (567)) and approximate (Eq. (8)) methods
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Pressure surface TLC image
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Suction surface TLC image
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Calibration of wide band TLC
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Temperature history from TLC and curve fit
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Heat transfer coefficient from a DHFG
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Temperatures of TLC and DHFG during a test
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Influence of roughness on midspan film cooling effectiveness: cylindrical cooling holes
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Influence of roughness on midspan film cooling effectiveness: fan-shaped cooling holes
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Influence of roughness on midspan heat transfer coefficient: cylindrical cooling holes
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Influence of roughness on midspan heat transfer coefficient: fan-shaped cooling holes

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