Imperial College London
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Prof Francesco Montomoli

Faculty of Engineering, Department of Aeronautics

Professor in Computational Aerodynamics
 
 
 
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Contact

 

+44 (0)20 7594 5151f.montomoli Website

 
 
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Location

 

215City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Suman:2019:10.1016/j.pecs.2019.05.001,
author = {Suman, A and Casari, N and Fabbri, E and Di, Mare L and Montomoli, F and Pinelli, M},
doi = {10.1016/j.pecs.2019.05.001},
journal = {Progress in Energy and Combustion Science},
pages = {103--151},
title = {Generalization of particle impact behavior in gas turbine via non-dimensional grouping},
url = {http://dx.doi.org/10.1016/j.pecs.2019.05.001},
volume = {74},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Fouling in gas turbines is caused by airborne contaminants which, under certain conditions, adhere to aerodynamicsurfaces upon impact. The growth of solid deposits causes geometric modifications of the blades in terms of bothmean shape and roughness level. The consequences of particle deposition range from performance deterioration tolife reduction to complete loss of power. Due to the importance of the phenomenon, several methods to model particlesticking have been proposed in literature. Most models are based on the idea of a sticking probability, defined as thelikelihood a particle has to stick to a surface upon impact. Other models investigate the phenomenon from adeterministic point of view by calculating the energy available before and after the impact. The nature of the materialsencountered within this environment does not lend itself to a very precise characterization, consequently, it is difficultto establish the limits of validity of sticking models based on field data or even laboratory scale experiments. As aresult, predicting the growth of solid deposits in gas turbines is still a task fraught with difficulty. In this work, two nondimensionalparameters are defined to describe the interaction between incident particles and a substrate, withparticular reference to sticking behavior in a gas turbine. In the first part of the work, historical experimental data onparticle adhesion under gas turbine-like conditions are analyzed by means of relevant dimensional quantities (e.g.particle viscosity, surface tension, and kinetic energy). After a dimensional analysis, the data then are classified usingnon-dimensional groups and a universal threshold for the transition from erosion to deposition and from fragmentationto splashing based on particle properties and impact conditions is identified. The relation between particle kineticenergy/surface energy and the particle temperature normalized by the softening temperature represents the originalnon-dimensional groups
AU  - Suman,A
AU  - Casari,N
AU  - Fabbri,E
AU  - Di,Mare L
AU  - Montomoli,F
AU  - Pinelli,M
DO  - 10.1016/j.pecs.2019.05.001
EP  - 151
PY  - 2019///
SN  - 1873-216X
SP  - 103
TI  - Generalization of particle impact behavior in gas turbine via non-dimensional grouping
T2  - Progress in Energy and Combustion Science
UR  - http://dx.doi.org/10.1016/j.pecs.2019.05.001
UR  - http://hdl.handle.net/10044/1/70246
VL  - 74
ER  -
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