Imperial College London
Alternate

ProfessorWilliamJones

Faculty of Engineering, Department of Mechanical Engineering

Professor
 
 
 
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Contact

 

+44 (0)20 7594 7037w.jones

 
 
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Assistant

 

Ms Fabienne Laperche +44 (0)20 7594 7033

 
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Location

 

607City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Koniavitis:2018:10.1016/j.combustflame.2018.04.004,
author = {Koniavitis, P and Rigopoulos, S and Jones, W},
doi = {10.1016/j.combustflame.2018.04.004},
journal = {Combustion and Flame},
pages = {85--106},
title = {Reduction of a detailed chemical mechanism for a kerosenesurrogate via RCCE-CSP},
url = {http://dx.doi.org/10.1016/j.combustflame.2018.04.004},
volume = {194},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Detailed mechanisms for kerosene surrogate fuels contain hundreds of species and thousands of reactions, indicating a necessity for reduced mechanisms. In this work, we employ a framework that combines Rate-Controlled Constrained Equilibrium (RCCE) with Computational Singular Perturbation (CSP) for systematic reduction based on timescale analysis, to reduce a detailed mechanism for a jet fuel surrogate with n-dodecane, methylcyclohexane and m-xylene. Laminar non-premixed flamelets are utilised for the CSP analysis for different strain rates and therefore different scalar dissipation rate, covering the flammable region of strain rates for the surrogate fuel.Two RCCE-reduced mechanisms are developed via an RCCE-CSP methodology, one with 17 and one with 42 species, and their accuracy is assessed in a range of cases that test the performance of the reduced mechanism under both non-premixed and premixed conditions and its dynamic response. These include non-premixed flamelets with varying strain rate, laminar premixed flames for a range of equivalence ratios and pressures, flamelets ignited by an artificial pilot or by hot air, and unsteady flamelets with time-dependent strain rate.The profiles of both major and minor species, as well as important combustion characteristics such as the ignition strain rate and the laminar flame speed, are investigated. The structure of non-premixed flamelets is very well predicted, while the premixed flames are overall well predicted apart from a few deviations in certain species and an underprediction in the laminar flame speed. Apart from the large reduction in dimensionality, the reduction in computational time is also considerable (up to 19 times). As the detailed mechanism comprises 367 species and 1892 reactions, this paper presents the first application of RCCE to a mechanism of this size, as well as a comprehensive validation in a set of cases that include non-premixed and premixed laminar flames, atmospheric and elevated pressur
AU  - Koniavitis,P
AU  - Rigopoulos,S
AU  - Jones,W
DO  - 10.1016/j.combustflame.2018.04.004
EP  - 106
PY  - 2018///
SN  - 0010-2180
SP  - 85
TI  - Reduction of a detailed chemical mechanism for a kerosenesurrogate via RCCE-CSP
T2  - Combustion and Flame
UR  - http://dx.doi.org/10.1016/j.combustflame.2018.04.004
UR  - http://hdl.handle.net/10044/1/59313
VL  - 194
ER  -
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