TECHNICAL PAPERS: Gas Turbines: Heat Transfer and Turbomachinery

Heat Transfer Measurements Using Liquid Crystals in a Preswirl Rotating-Disk System

[+] Author and Article Information
Gary D. Lock, Youyou Yan, Paul J. Newton, Michael Wilson, J. Michael Owen

Department of Mechanical Engineering, University of Bath, Bath BA2 7AY, UK

J. Eng. Gas Turbines Power 127(2), 375-382 (Apr 15, 2005) (8 pages) doi:10.1115/1.1787509 History: Received October 01, 2002; Revised March 01, 2003; Online April 15, 2005
Copyright © 2005 by ASME
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Simplified diagram of typical preswirl cooling-air system for a gas turbine
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Schematic diagram of test-section geometry
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Schematic layout of experiment
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Increase in air temperature with time measured at two locations; a fitted curve is also shown for m=3
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Calibrated temperature versus normalized hue for three crystals at three strobe frequencies
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a–d (top to bottom) Video recordings of disk surface showing change of color of TLC with time
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Contours of Nu: Reϕ≈0.8×106T≈0.125,βp≈0.5; the disk is rotating clockwise
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Effect of Reϕ on contours Nu for λT≈0.36 and βp≈1.4: (a) Reϕ≈0.8×106, (b) Reϕ≈1.18×106; the disk is rotating clockwise
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Effect of Reϕ on radial variation of Nu (a) λT≈0.125,βp≈0.52; (b) λT≈0.36,βp≈1.4Reϕ≈0.8×106 • Reϕ≈1.2×106
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Heat transfer coefficient versus normalized radius for viscous and inertial flows. ▴ Viscous—H40; • Inertial—H40; ▴ Viscous—H30; • Inertial—H30. (h uncertainty for 0.2°C temperature uncertainty.)



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