Local mass transfer measurements were conducted on the tip of a turbine blade in a five-blade linear cascade with a blade-centered configuration. The tip clearance levels ranged from 0.6 to 6.9% of blade chord. The effect of relative motion between the casing and the blade tip was simulated using a moving endwall made of neoprene mounted on the top of the wind tunnel. Data were obtained for a single Reynolds number of based on cascade exit velocity and blade chord. Pressure measurements indicate that the effect of endwall motion on blade loading at a clearance of 0.6% of blade chord is to reduce the pressure gradients driving the tip leakage flow. With the introduction of endwall motion, there is a reduction of about 9% in mass transfer levels at a clearance of 0.6% of chord. This is presumably due to the tip leakage vortex coming closer to the suction side of the blade and ‘blocking the flow,’ leading to reduced tip gap velocities and hence lower mass transfer.
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April 2003
Technical Papers
Effect of Endwall Motion on Blade Tip Heat Transfer
V. Srinivasan,
V. Srinivasan
Heat Transfer Laboratory, Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455
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R. J. Goldstein
R. J. Goldstein
Heat Transfer Laboratory, Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455
Search for other works by this author on:
V. Srinivasan
Heat Transfer Laboratory, Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455
R. J. Goldstein
Heat Transfer Laboratory, Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455
Contributed by the International Gas Turbine Institute for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received by the IGTI August 15, 2002. Associate Editor: S. Bunker.
J. Turbomach. Apr 2003, 125(2): 267-273 (7 pages)
Published Online: April 23, 2003
Article history
Received:
August 15, 2002
Online:
April 23, 2003
Citation
Srinivasan , V., and Goldstein, R. J. (April 23, 2003). "Effect of Endwall Motion on Blade Tip Heat Transfer ." ASME. J. Turbomach. April 2003; 125(2): 267–273. https://doi.org/10.1115/1.1554411
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