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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

## Abstract

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 $1 μm$, $3 μm$, $5 μm$, $7 μm$, and $10 μm$ are investigated using Lagrangian dynamics. The $1 μm$ 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 $10 μm$ 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 $3 μm$, $5 μm$, and $7 μm$ 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 $10 μm$ particles, 70–65% of $7 μm$ particles, 40–50% of $5 μm$ particles, 15% of $3 μm$ particles, and less than 1% of $1 μm$ 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 $5 μm$ and $7 μm$ particles. It is only at $BR=1.2$ that $10 μm$ particles contribute to erosive wear in the coolant hole.

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## Figures

Figure 1

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

Figure 2

Entrainment of hot mainstream

Figure 3

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

Figure 4

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

Figure 5

Percentage of deposited particles of each size

Figure 6

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

Figure 7

Averaged impact angle of 5 μm erosive particles

Figure 8

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

Figure 9

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

Figure 10

Impact angle of 5 μm erosive particles

Figure 11

Impact velocity of 5 μm erosive particles

Figure 13

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

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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