In a modern gas turbine engine, the outer casing (shroud) of the shroudless high-pressure turbine is exposed to a combination of high flow temperatures and heat transfer coefficients. The casing is consequently subjected to high levels of convective heat transfer, a situation that is complicated by flow unsteadiness caused by periodic blade-passing events. In order to arrive at an overtip casing design that has an acceptable service life, it is essential for manufacturers to have appropriate predictive methods and cooling system configurations. It is known that both the flow temperature and boundary layer conductance on the casing wall vary during the blade-passing cycle. The current article reports the measurement of spatially and temporally resolved heat transfer coefficient on the overtip casing wall of a fully scaled transonic turbine stage experiment. The results indicate that is a maximum when a blade tip is immediately above the point in question, while the lower values of are observed when the point is exposed to the rotor passage flow. Time-resolved measurements of static pressure are used to reveal the unsteady aerodynamic situation adjacent to the overtip casing wall. The data obtained from this fully scaled transonic turbine stage experiment are compared to previously published heat transfer data obtained in low-Mach number cascade-style tests of similar high-pressure blade geometries.
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October 2008
Research Papers
The Effects of Blade Passing on the Heat Transfer Coefficient of the Overtip Casing in a Transonic Turbine Stage
Steven J. Thorpe,
Steven J. Thorpe
Department of Aeronautical and Automotive Engineering,
e-mail: s.j.thorpe@lboro.ac.uk
Loughborough University
, Loughborough LE12 7TW, UK
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Roger W. Ainsworth
Roger W. Ainsworth
Department of Engineering Science,
University of Oxford
, Oxford, UK
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Steven J. Thorpe
Department of Aeronautical and Automotive Engineering,
Loughborough University
, Loughborough LE12 7TW, UKe-mail: s.j.thorpe@lboro.ac.uk
Roger W. Ainsworth
Department of Engineering Science,
University of Oxford
, Oxford, UKJ. Turbomach. Oct 2008, 130(4): 041009 (8 pages)
Published Online: July 31, 2008
Article history
Received:
August 18, 2006
Revised:
January 10, 2007
Published:
July 31, 2008
Citation
Thorpe, S. J., and Ainsworth, R. W. (July 31, 2008). "The Effects of Blade Passing on the Heat Transfer Coefficient of the Overtip Casing in a Transonic Turbine Stage." ASME. J. Turbomach. October 2008; 130(4): 041009. https://doi.org/10.1115/1.2776950
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