This work supports new gas turbine designs for improved performance by evaluating endwall heat transfer rates in a cascade that is representative of a first-stage stator passage and incorporates endwall assembly features and leakage. Assembly features, such as gaps in the endwall and misalignment of those gaps, disrupt the endwall boundary layer, typically leading to enhanced heat transfer rates. Leakage flows through such gaps within the passage can also affect endwall boundary layers and may induce additional secondary flows and vortex structures in the passage near the endwall. The present paper documents leakage flow and misalignment effects on the endwall heat transfer coefficients within a passage which has one axially contoured and one straight endwall. In particular, features associated with the combustor-to-turbine transition piece and the assembly joint on the vane platform are addressed.
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October 2007
Research Papers
Heat Transfer Measurements in a First-Stage Nozzle Cascade Having Endwall Contouring: Misalignment and Leakage Studies
T. W. Simon
T. W. Simon
Heat Transfer Laboratory, Department of Mechanical Engineering,
e-mail: tsimon@me.umn.edu
University of Minnesota
, Minneapolis, MN 55455
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J. D. Piggush
T. W. Simon
Heat Transfer Laboratory, Department of Mechanical Engineering,
University of Minnesota
, Minneapolis, MN 55455e-mail: tsimon@me.umn.edu
J. Turbomach. Oct 2007, 129(4): 782-790 (9 pages)
Published Online: August 11, 2006
Article history
Received:
July 23, 2006
Revised:
August 11, 2006
Citation
Piggush, J. D., and Simon, T. W. (August 11, 2006). "Heat Transfer Measurements in a First-Stage Nozzle Cascade Having Endwall Contouring: Misalignment and Leakage Studies." ASME. J. Turbomach. October 2007; 129(4): 782–790. https://doi.org/10.1115/1.2720506
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