The leading edge region along the endwall of a stator vane experiences high heat transfer rates resulting from the formation of horseshoe vortices. Typical gas turbine endwall designs include a leakage slot at the combustor-turbine interface as well as film-cooling holes. Past studies have documented the formation of a horseshoe vortex at the leading edge of a vane, but few studies have documented the flowfield in the presence of an interface slot and film-cooling jets. In this paper, a series of flowfield measurements is evaluated at the leading edge with configurations including a baseline with neither film-cooling holes nor an upstream slot, a row of film-cooling holes and an interface slot, and a row of film-cooling holes in a trench and an interface slot. The results indicated the formation of a second vortex present for the case with film-cooling holes and a slot relative to the baseline study. In addition, turbulence intensity levels as high as 50% were measured at the leading edge with film-cooling holes and a slot compared with the 30% measured for the baseline study. A trench was shown to provide improved overall cooling relative to the no trench configuration as more of the coolant stayed attached to the endwall surface with the trench.
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October 2009
Research Papers
Film-Cooling Flowfields With Trenched Holes on an Endwall
N. Sundaram,
e-mail: sundar.narayan@cpsusainc.net
N. Sundaram
Creative Power Solutions USA, Inc.
, 11010 North Saguaro Boulevard, Fountain Hills, AZ 85268
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K. A. Thole
K. A. Thole
Department of Mechanical and Nuclear Engineering,
Pennsylvania University
, University Park, PA 16802
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N. Sundaram
Creative Power Solutions USA, Inc.
, 11010 North Saguaro Boulevard, Fountain Hills, AZ 85268e-mail: sundar.narayan@cpsusainc.net
K. A. Thole
Department of Mechanical and Nuclear Engineering,
Pennsylvania University
, University Park, PA 16802J. Turbomach. Oct 2009, 131(4): 041007 (10 pages)
Published Online: July 1, 2009
Article history
Received:
August 19, 2008
Revised:
August 27, 2008
Published:
July 1, 2009
Citation
Sundaram, N., and Thole, K. A. (July 1, 2009). "Film-Cooling Flowfields With Trenched Holes on an Endwall." ASME. J. Turbomach. October 2009; 131(4): 041007. https://doi.org/10.1115/1.3068316
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