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Research Papers

Simulations of Multiphase Particle Deposition on Endwall Film-Cooling Holes in Transverse Trenches

[+] Author and Article Information
Seth A. Lawson

Department of Mechanical and Nuclear Engineering,  The Pennsylvania State University, University Park, PAseth.lawson@contr.netl.doe.gov

Karen A. Thole

Department of Mechanical and Nuclear Engineering,  The Pennsylvania State University, University Park, PAkthole@engr.psu.edu

J. Turbomach 134(5), 051040 (Jun 05, 2012) (10 pages) doi:10.1115/1.4004756 History: Received July 18, 2011; Revised July 20, 2011; Published June 05, 2012; Online June 05, 2012

Integrated gasification combined cycle (IGCC) power plants allow for increased efficiency and reduced emissions as compared to pulverized coal plants. A concern with IGCCs is that impurities in the fuel from the gasification of coal can deposit on turbine components reducing the performance of sophisticated film-cooling geometries. Studies have shown that recessing a row of film-cooling holes in a transverse trench can improve cooling performance; however, the question remains as to whether or not these improvements exist in severe environments such as when particle deposition occurs. Dynamic simulations of deposition were completed using wax injection in a large-scale vane cascade with endwall film cooling. Endwall cooling effectiveness was quantified in two specific endwall locations using trenches with depths of 0.4D, 0.8D, and 1.2D, where D is the diameter of a film-cooling hole. The effects of trench depth, momentum flux ratio, and particle phase on adiabatic effectiveness were quantified using infrared thermography. Results showed that the 0.8D trench outperformed other geometries with and without deposition on the surface. Deposition of particles reduced the cooling effectiveness by as much as 15% at I = 0.23 with the trenched holes as compared to 30% for holes that were not placed in a transverse trench.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Illustration of wind tunnel facility

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Figure 2

Schematic of the (a) endwall film cooling configuration, (b) leading edge region, and (c) cross section of the stagnation region

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Figure 3

Schematic of turbulence grid with wax injection system developed by Lawson and Thole [1]

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Figure 4

Contours of adiabatic effectiveness for different trench depths with no deposition

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Figure 5

Baseline area-averaged effectiveness for the leading edge and passage cooling rows with different trench depths and no deposition

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Figure 6

Surface photos and effectiveness contours at I = 3.6 for all trench depths after deposition

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Figure 7

Area-averaged effectiveness and effectiveness reduction for the leading edge row after deposition

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Figure 8

Area-averaged effectiveness and effectiveness reduction for the passage row after deposition

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Figure 9

Area-averaged effectiveness of passage and leading edge cooling rows for no trench and the 0.8D trench before and after deposition

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Figure 10

Flow visualization pictures at I = 0.23 and I = 3.6 for (a) no trench and (b) the 0.8D trench

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Figure 11

Surface photos and effectiveness contours for the 0.8D trench at all momentum flux ratios after deposition at TSPmax  = 1.2

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Figure 12

Surface photographs and adiabatic effectiveness contours after deposition for the 0.8D trench at (a) I = 0.23 and (b) I = 3.6

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Figure 13

Effectiveness reduction for the leading edge and passage rows for the 0.8D trench at TSPmax  = 1.2 and TSPmax  = 2.2

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