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Research Papers

Effects of Syngas Ash Particle Size on Deposition and Erosion of a Film Cooled Leading Edge

[+] Author and Article Information
Ali Rozati, Danesh K. Tafti, Sai Shrinivas Sreedharan

Department of Mechanical Engineering, High Performance Computational Fluid-Thermal Sciences and Engineering Laboratory, Virginia Polytechnic Institute and State University, Blacksburg VA 24061

J. Turbomach 133(1), 011010 (Sep 09, 2010) (9 pages) doi:10.1115/1.4000492 History: Received December 23, 2008; Revised January 26, 2009; Published September 09, 2010; Online September 09, 2010

The paper investigates the deposition and erosion caused by Syngas ash particles in a film cooled leading edge region of a representative turbine vane. The carrier phase is predicted using large eddy simulation for three blowing ratios of 0.4, 0.8, and 1.2. Ash particle sizes of 1μm, 3μm, 5μm, 7μm, and 10μm are investigated using Lagrangian dynamics. The 1μm particles with momentum Stokes number, Stp=0.03 (based on approach velocity and leading edge diameter), follow the flow streamlines around the leading edge and few particles reach the blade surface. The 10μm particles, on the other hand with a high momentum Stokes number, Stp=0.03, directly impinge on the surface, with blowing ratio having a minimal effect. The 3μm, 5μm, and 7μm particles with Stp=0.03, 0.8 and 1.4, respectively, show some receptivity to coolant flow and blowing ratio. On a number basis, 85–90% of the 10μm particles, 70–65% of 7μm particles, 40–50% of 5μm particles, 15% of 3μm particles, and less than 1% of 1μm particles deposit on the surface. Overall there is a slight decrease in percentage of particles deposited with increase in blowing ratio. On the other hand, the potential for erosive wear is highest in the coolant hole and is mostly attributed to 5μm and 7μm particles. It is only at BR=1.2 that 10μm particles contribute to erosive wear in the coolant hole.

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Figures

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Figure 1

(a) Computational domain; and (b) close-up view of compound angle film cooling jet

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Figure 2

Entrainment of hot mainstream

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Figure 3

Distribution of % deposited particles of each blowing ratio on the surface

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Figure 4

Distribution of % deposited particle at each blowing ratio in the coolant hole

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Figure 5

Percentage of deposited particles of each size

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Figure 6

Percentage of 5 micron erosive particle on the surface (out of all 5 μm particles)

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Figure 7

Averaged impact angle of 5 μm erosive particles

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Figure 8

Averaged impact velocity (normalized by u∞) of 5 μm erosive particles

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Figure 9

Percentage of 5 μm erosive particle in the coolant hole (out of all 5 μm particles)

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Figure 10

Impact angle of 5 μm erosive particles

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Figure 11

Impact velocity of 5 μm erosive particles

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Figure 12

(a) Percentage of 10 μm erosive particles in the coolant hole (out of all 10 μm particles); (b) impact angle; and (c) impact velocity at BR=1.2

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Figure 13

Percentage of erosive particles out of the total particles of each size

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