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Research Papers: Gas Turbines: Turbomachinery

Predicting Blade Leading Edge Erosion in an Axial Induced Draft Fan

[+] Author and Article Information
Alessandro Corsini, Andrea Marchegiani, Franco Rispoli, Paolo Venturini

Dipartimento di Ingegneria Meccanica e Aerospaziale,  Sapienza University of Rome, Via Eudossiana, 18, I-00184 Rome, Italy

Anthony G. Sheard

 Fläkt Woods Limited, Axial Way, Colchester, CO4 5AR, UK

J. Eng. Gas Turbines Power 134(4), 042601 (Jan 30, 2012) (9 pages) doi:10.1115/1.4004724 History: Received May 13, 2011; Revised May 20, 2011; Published January 30, 2012; Online January 30, 2012

Induced draft fans extract coal fired boiler combustion products, including particles of un-burnt coal and ash. As a consequence of the particles, the axial fan blades’ leading edges are subject to erosion. Erosion results in the loss of the blade leading edge aerodynamic profile and a reduction of blade chord and effective camber that together degrade aerodynamic performance. An experimental study demonstrated that while the degradation of aerodynamic performance begins gradually, it collapses as blade erosion reaches a critical limit. This paper presents a numerical study on the evolution of blade leading edge erosion patterns in an axial induced draft fan. The authors calculated particle trajectories using an in-house computational fluid dynamic (CFD) solver coupled with a trajectory predicting solver based on an original finite element interpolation scheme. The numerical study clarifies the influence of flow structure, initial blade geometry, particle size, and concentration on erosion pattern.

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Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

PFS fan assembly [10]

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Figure 2

PFS blade in-service erosion (a) suction surface and (b) pressure surface [26]

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Figure 3

PFS blade leading edge wearing [10]

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Figure 4

Cloud velocity distribution during the impact

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Figure 5

Experimental erosion rate for 304 stainless steel [29]

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Figure 6

Computational grids of fan rotor: (a) tetrahedral mesh and (b) hexahedral mesh

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Figure 7

Particle span wise concentration profile

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Figure 8

PFS fan capacity range

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Figure 9

Computed and measured PFS performance (symbols: experiments, line-circles: nonlinear k-ɛ, and line-squares: standard k-ε)

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Figure 10

Rotor flow field, total pressure field about the PFS fan blade: (a) suction surface and (b) pressure surface

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Figure 11

Rotor flow field, three-dimensional streamlines, and static pressure contours on the PFS fan blade: (a) suction surface and (b) pressure surface

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Figure 12

PFS fan blade particle impact frequency

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Figure 13

PFS fan blade erosion rate (mg/m2 /g/s)

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Figure 14

PFS fan blade comparison of in-service and predicted eroded areas

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