This paper investigates heat transfer in a rotating disk system using preswirled cooling air from nozzles at high and low radius. The experiments were conducted over a range of rotational speeds, flow rates, and preswirl ratios. Narrow-band thermochromic liquid crystal (TLC) was specifically calibrated for application to experiments on a disk, rotating at and subsequently used to measure surface temperature in a transient experiment. The TLC was viewed through the transparent polycarbonate disk using a digital video camera and strobe light synchronized to the disk frequency. The convective heat transfer coefficient was subsequently calculated from the one-dimensional solution of Fourier's conduction equation for a semi-infinite wall. The analysis was accounted for the exponential rise in the air temperature driving the heat transfer, and for the experimental uncertainties in the measured values of . The experimental data was supported by “flow visualization,” determined from CFD. Two heat transfer regimes were revealed for the low-radius preswirl system: a viscous regime at relatively low coolant flow rates, and an inertial regime at higher flow rates. Both regimes featured regions of high heat transfer where thin, boundary layers replaced air exiting through receiver holes at high radius on the rotating disk. The heat transfer in the high-radius preswirl system was shown to be dominated by impingement under the flow conditions tested.
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April 2011
Research Papers
Effect of Radial Location of Nozzles on Heat Transfer in Preswirl Cooling Systems
V. U. Kakade,
V. U. Kakade
Department of Mechanical Engineering,
University of Bath
, Bath BA2 7AY, U.K
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G. D. Lock,
G. D. Lock
Department of Mechanical Engineering,
University of Bath
, Bath BA2 7AY, U.K
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M. Wilson,
M. Wilson
Department of Mechanical Engineering,
University of Bath
, Bath BA2 7AY, U.K
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J. M. Owen,
J. M. Owen
Department of Mechanical Engineering,
University of Bath
, Bath BA2 7AY, U.K
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J. E. Mayhew
J. E. Mayhew
Department of Mechanical Engineering,
University of Bath
, Bath BA2 7AY, U.K
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V. U. Kakade
Department of Mechanical Engineering,
University of Bath
, Bath BA2 7AY, U.K
G. D. Lock
Department of Mechanical Engineering,
University of Bath
, Bath BA2 7AY, U.K
M. Wilson
Department of Mechanical Engineering,
University of Bath
, Bath BA2 7AY, U.K
J. M. Owen
Department of Mechanical Engineering,
University of Bath
, Bath BA2 7AY, U.K
J. E. Mayhew
Department of Mechanical Engineering,
University of Bath
, Bath BA2 7AY, U.KJ. Turbomach. Apr 2011, 133(2): 021023 (8 pages)
Published Online: October 26, 2010
Article history
Received:
July 27, 2009
Revised:
August 5, 2009
Online:
October 26, 2010
Published:
October 26, 2010
Citation
Kakade, V. U., Lock, G. D., Wilson, M., Owen, J. M., and Mayhew, J. E. (October 26, 2010). "Effect of Radial Location of Nozzles on Heat Transfer in Preswirl Cooling Systems." ASME. J. Turbomach. April 2011; 133(2): 021023. https://doi.org/10.1115/1.4001189
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