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Research Papers

Simulations of Multiphase Particle Deposition on a Gas Turbine Endwall With Impingement and Film Cooling

[+] Author and Article Information
Amy Mensch

Mem. ASME
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

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 137(11), 111002 (Aug 18, 2015) (8 pages) Paper No: TURBO-15-1022; doi: 10.1115/1.4031177 History: Received February 08, 2015; Revised July 16, 2015

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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Figures

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Fig. 1

Configuration of a conjugate endwall with impingement and film cooling and simulated deposition

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Fig. 2

Depiction of (a) the large-scale low-speed wind tunnel, and (b) the test section containing the Pack-B linear blade cascade and conjugate endwall

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Fig. 3

Schematic of internal and external cooling scheme from the top view, also showing the area average outline and locations of internal thermocouples

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Fig. 4

Schematic of two-nozzle wax injection system located in the turbulence grid

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Fig. 5

Film cooling only contours of overall effectiveness without deposition, ϕf, contours of wax effectiveness, ωf, and deposition photographs for (a) Mavg = 0.6 and (b) Mavg = 1.0

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Fig. 6

Film and impingement cooling contours of overall effectiveness without deposition, ϕ, contours of wax effectiveness, ω, and deposition photographs for (a) Mavg = 0.6 and (b) Mavg = 1.0

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Fig. 7

Laterally averaged overall effectiveness without deposition, ϕ, and wax effectiveness, ω, across the passage for Mavg = 0.6 and 1.0 for (a) film cooling only and (b) film and impingement

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Fig. 8

Area-averaged overall effectiveness without deposition, ϕ, area-averaged wax effectiveness, ω, and average internal effectiveness with and without deposition, ϕi, ϕi,dep, for film cooling only and combined film and impingement at different blowing ratios

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