Designing turbine components for maximum aerodynamic performance with adequate cooling is a critical challenge for gas turbine engineers, particularly at the endwall of a turbine, due to complex secondary flows. To complicate matters, impurities from the fuel and intake air can deposit on film-cooled components downstream of the combustor. Deposition-induced roughness can reduce cooling effectiveness and aerodynamic performance dramatically. One method commonly used for reducing the effects of secondary flows on aerodynamic performance is endwall contouring. The current study evaluates deposition effects on endwall contouring given the change to the secondary flow pattern. For the current study, deposition was dynamically simulated in a turbine cascade to determine its effects on film-cooling with and without endwall contouring. Computationally predicted impactions were in qualitative agreement with experimental deposition simulations, showing that contouring reduced deposition around strategically placed film-cooling holes. Deposition reduced cooling effectiveness by 50% on a flat endwall and 40% on an identically cooled contoured endwall. Although 40% is still a dramatic reduction in effectiveness, the method of using the endwall contouring to alter deposition effects shows promise.
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Research-Article
Simulations of Multiphase Particle Deposition on a Nonaxisymmetric Contoured Endwall With Film-Cooling
Seth A. Lawson,
Stephen P. Lynch,
Karen A. Thole
Karen A. Thole
e-mail: kthole@engr.psu.edu
Department of Mechanical and Nuclear Engineering,
136 Reber Building,
University Park, PA 16802
The Pennsylvania State University
,Department of Mechanical and Nuclear Engineering,
136 Reber Building,
University Park, PA 16802
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Seth A. Lawson
e-mail: seth.lawson@netl.doe.gov
Stephen P. Lynch
e-mail: lynchsp@utrc.utc.com
Karen A. Thole
e-mail: kthole@engr.psu.edu
Department of Mechanical and Nuclear Engineering,
136 Reber Building,
University Park, PA 16802
The Pennsylvania State University
,Department of Mechanical and Nuclear Engineering,
136 Reber Building,
University Park, PA 16802
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received July 11, 2012; final manuscript received July 31, 2012; published online March 25, 2013. Editor: David Wisler.
J. Turbomach. May 2013, 135(3): 031032 (11 pages)
Published Online: March 25, 2013
Article history
Received:
July 11, 2012
Revision Received:
July 31, 2012
Citation
Lawson, S. A., Lynch, S. P., and Thole, K. A. (March 25, 2013). "Simulations of Multiphase Particle Deposition on a Nonaxisymmetric Contoured Endwall With Film-Cooling." ASME. J. Turbomach. May 2013; 135(3): 031032. https://doi.org/10.1115/1.4007598
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