Comparison of the performance of several recent syngas combustion mechanisms
Zsély, István Gy
Curran, Henry J.
MetadataShow full item record
This item's downloads: 33 (view details)
Olm, Carsten, Zsély, István Gy, Varga, Tamás, Curran, Henry J., & Turányi, Tamás. (2015). Comparison of the performance of several recent syngas combustion mechanisms. Combustion and Flame, 162(5), 1793-1812. doi: http://dx.doi.org/10.1016/j.combustflame.2014.12.001
A large set of experimental data was accumulated for syngas combustion: ignition studies in shock tubes (732 data points in 62 datasets) and in rapid compression machines (492/47), flame velocity determinations (2116/217) and species concentration measurements from flow reactors (1104/58), shock tubes (436/21) and jet-stirred reactors (90/3). In total, 4970 data points in 408 datasets from 52 publications were collected covering wide ranges of temperature T, pressure p, equivalence ratio phi, CO/H-2 ratio and diluent concentration X-dil. 16 recent syngas combustion mechanisms were tested against these experimental data, and the dependence of their predictions on the types of experiment and the experimental conditions was investigated. Several clear trends were found. Ignition delay times measured in rapid compression machines (RCM) and in shock tubes (ST) at temperatures below 1000 K could not be well-predicted. Particularly for shock tubes, facility effects at temperatures below 1000 K could not be excluded. The accuracy of the reproduction of ignition delay times did not change significantly with pressure. The agreement of measured and simulated laminar flame velocities is better at low initial (i.e. cold side) temperatures, at fuel-lean conditions, for CO-rich and highly diluted mixtures. The reproduction of the experimental flame velocities is better when these were measured using the heat flux method or the counterflow twin-flame technique, compared to the flame cone method and the outwardly propagating spherical flame approach. With respect to all data used in this comparison, five mechanisms were identified that reproduce the experimental data similarly well. These are the NUIG-NGM-2010, Keromnes-2013, Davis-2005, Li-2007 and USC-II-2007 mechanisms, in decreasing order of their overall performance. The influence of poorly reproduced experiments and weighting on the performance of the mechanisms was investigated. Furthermore, an analysis of local sensitivity coefficients was carried out to determine the influence of selected reactions at the given experimental conditions and to identify those reactions that require more attention in future development of syngas combustion models.
This item is available under the Attribution-NonCommercial-NoDerivs 3.0 Ireland. No item may be reproduced for commercial purposes. Please refer to the publisher's URL where this is made available, or to notes contained in the item itself. Other terms may apply.
The following license files are associated with this item:
Showing items related by title, author, creator and subject.
Klusak, Ewa, Monika (2017-02-24)To restore proper function of the heart, diseased valves require repair or replacement. Mechanical heart valves are one of the treatments available. Despite their superior durability in comparison with biological prostheses, ...
Varga, T.; Nagy, T.; Olm, C.; Zsély, I. Gy; Pálvölgyi, R.; Valkó, É; Vincze, G.; Cserháti, M.; Curran, Henry J.; Turányi, T. (Elsevier ScienceDirect, 2014-07-05)The Keromnes et al. (2013) mechanism for hydrogen combustion has been optimized using a large set of indirect experimental data, consisting of ignition measurements in shock tubes (566 datapoints in 43 datasets) and rapid ...
Computational investigation of in situ chondrocyte deformation and actin cytoskeleton remodelling under physiological loading Dowling, Enda P.; Ronan, William; McGarry, J. Patrick (Elsevier, 2012-12-24)Previous experimental studies have determined local strain fields for both healthy and degenerate cartilage tissue during mechanical loading. However, the biomechanical response of chondrocytes in situ, in particular the ...