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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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References

Owen, J. M., and Rogers, R. H., 1989, Flow and Heat Transfer in Rotating Disc Systems: Vol. 1, Rotor-Stator Systems, Research Studies Press, Taunton, UK and Wiley, NY.
Owen, J. M., and Wilson, M., 2000, “Some Current Research in Rotating-Disc Systems,” in Turbine 2000 Int. Symp. on Heat Transfer in Gas Turbine Systems, Turkey, August 13–18, in Heat Transfer in Gas Turbine Systems, Annals of the New York Academy of Sciences, 934 , pp. 206–221.
Metzger,  D. E., Bunker,  R. S., and Bosch,  G., 1991, “Transient Liquid Crystal Measurement of Local Heat Transfer on a Rotating Disk With Jet Impingement,” ASME J. Turbomach., 113, pp. 52–59.
Karabay,  H., Wilson,  M., and Owen,  J. M., 2001, “Predictions of Effect of Swirl on Flow and Heat Transfer in a Rotating Cavity,” Int. J. Heat Fluid Flow, 22, pp. 143–155.
Pilbrow,  R., Karabay,  H., Wilson,  M., and Owen,  J. M., 1999, “Heat Transfer in a ‘Cover-Plate’ Pre-Swirl Rotating-Disc System,” ASME J. Turbomach., 121, pp. 249–256.
Yan, Y., Gord, M. F., Lock, G. D., Wilson, M., and Owen, J. M., 2002, Fluid dynamics of a pre-swirl rotating-disk system, ASME paper 2002-GT-30415 (to be published in the J Turbomachinery).
Gillespie, D. R. H., Wang, Z., and Ireland, P. T., 2001, Heater element, European Patent No. 0847679.
Syson,  B. J., Pilbrow,  R. G., and Owen,  J. M., 1996, “Effect of Rotation on Temperature Response of Thermochromic Liquid Crystal,” Int. J. Heat Fluid Flow, 17, pp. 491–499.
Camci,  C., Glezer,  B., Owen,  J. M., Pilbrow,  R. G., and Syson,  B. J., 1996, “Application of Thermochromic Liquid Crystal to Rotating Surfaces,” ASME J. Turbomach., 118, pp. 408–413.
Gillespie,  D. R. H., Wang,  Z., and Ireland,  P. T., 1998, “Full Surface Local Heat Transfer Coefficient Measurements in a Model of an Integrally Cast Impingement Cooling Geometry,” ASME J. Turbomach., 120, pp. 92–99.
Newton,  P. J., Yan,  Y., Stevens,  N. E., Evatt,  S. T., Lock,  G. D., and Owen,  J. M., 2003, “Transient Heat Transfer Measurements Using Thermochromic Liquid Crystal. Part 1: An Improved Technique,” Int. J. Heat Fluid Flow, 24, pp. 14–22.
Yan,  Y., and Owen,  J. M., 2002, “Uncertainties in Transient Heat Transfer Measurements With Liquid Crystal,” Int. J. Heat Fluid Flow, 23, pp. 29–35.
Owen,  J. M., Newton,  P. J., and Lock,  G. D., 2003, “Transient Heat Transfer Measurements Using Thermochromic Liquid Crystal. Part 2: Experimental Uncertainties,” Int. J. Heat Fluid Flow, 24, pp. 23–28.
Chen,  J.-X., Gan,  X., and Owen,  J. M., 1996, “Heat Transfer in an Air-Cooled Rotor-Stator System,” ASME J. Turbomach., 118, pp. 444–451.
Butler,  R. J., and Baughn,  J. W., 1996, “The Effect of the Thermal Boundary Condition on Transient Method Heat Transfer Measurements on a Flat Plate With a Laminar Boundary Layer,” ASME J. Heat Transfer, 118, pp. 831–837.
Lin,  M., and Wang,  T., 2002, “A Transient Liquid Crystal Method Using a 3-D Inverse Transient Conduction Scheme,” Int. J. Heat Mass Transfer, 45, pp. 3491–3501.

Figures

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Schematic diagram of test-section geometry
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Schematic layout of experiment
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Simplified diagram of typical preswirl cooling-air system for a gas turbine
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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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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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