Replacing natural gas fuels with coal-derived syngas in industrial gas turbines can lead to molten particle deposition on the turbine components. The deposition of the particles, which originate from impurities in the syngas fuels, can increase surface roughness and obstruct film cooling holes. These deposition effects increase heat transfer to the components and degrade the performance of cooling mechanisms, which are critical for maintaining component life. The current experimental study dynamically simulated molten particle deposition on a conducting blade endwall with the injection of molten wax. The key nondimensional parameters for modeling of conjugate heat transfer and deposition were replicated in the experiment. The endwall was cooled with internal impingement jet cooling and film cooling. Increasing blowing ratio mitigated some deposition at the film cooling hole exits and in areas of coolest endwall temperatures. After deposition, the external surface temperatures and internal endwall temperatures were measured and found to be warmer than the endwall temperatures measured before deposition. Although the deposition helps insulate the endwall from the mainstream, the roughness effects of the deposition counteract the insulating effect by decreasing the benefit of film cooling and by increasing external heat transfer coefficients.
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November 2015
Research-Article
Simulations of Multiphase Particle Deposition on a Gas Turbine Endwall With Impingement and Film Cooling
Amy Mensch,
Amy Mensch
Mem. ASME
Mechanical and Nuclear
Engineering Department,
Pennsylvania State University,
University Park, PA 16802
e-mail: amy.mensch@nist.gov
Mechanical and Nuclear
Engineering Department,
Pennsylvania State University,
University Park, PA 16802
e-mail: amy.mensch@nist.gov
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Karen Thole
Karen Thole
Mem. ASME
Mechanical and Nuclear Engineering Department,
Pennsylvania State University,
University Park, PA 16802
e-mail: kthole@psu.edu
Mechanical and Nuclear Engineering Department,
Pennsylvania State University,
University Park, PA 16802
e-mail: kthole@psu.edu
Search for other works by this author on:
Amy Mensch
Mem. ASME
Mechanical and Nuclear
Engineering Department,
Pennsylvania State University,
University Park, PA 16802
e-mail: amy.mensch@nist.gov
Mechanical and Nuclear
Engineering Department,
Pennsylvania State University,
University Park, PA 16802
e-mail: amy.mensch@nist.gov
Karen Thole
Mem. ASME
Mechanical and Nuclear Engineering Department,
Pennsylvania State University,
University Park, PA 16802
e-mail: kthole@psu.edu
Mechanical and Nuclear Engineering Department,
Pennsylvania State University,
University Park, PA 16802
e-mail: kthole@psu.edu
1Corresponding author.
2Present address: Fire Research Division, National Institute of Standards and Technology, Gaithersburg, MD 20899.
Manuscript received February 8, 2015; final manuscript received July 16, 2015; published online August 18, 2015. Assoc. Editor: Jim Downs.
J. Turbomach. Nov 2015, 137(11): 111002 (8 pages)
Published Online: August 18, 2015
Article history
Received:
February 8, 2015
Revised:
July 16, 2015
Citation
Mensch, A., and Thole, K. (August 18, 2015). "Simulations of Multiphase Particle Deposition on a Gas Turbine Endwall With Impingement and Film Cooling." ASME. J. Turbomach. November 2015; 137(11): 111002. https://doi.org/10.1115/1.4031177
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