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Entropy 2017, 19(6), 264; doi:10.3390/e19060264

Joint Characteristic Timescales and Entropy Production Analyses for Model Reduction of Combustion Systems

1
Institute of Technical Thermodynamics, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
2
Department of Mathematics, Ben-Gurion University of the Negev, 84105 Beer-Sheva, Israel
*
Author to whom correspondence should be addressed.
Academic Editor: Dawn E. Holmes
Received: 15 April 2017 / Revised: 4 June 2017 / Accepted: 6 June 2017 / Published: 9 June 2017
(This article belongs to the Special Issue Maximum Entropy and Its Application II)
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Abstract

The reduction of chemical kinetics describing combustion processes remains one of the major topics in the combustion theory and its applications. Problems concerning the estimation of reaction mechanisms real dimension remain unsolved, this being a critical point in the development of reduction models. In this study, we suggest a combination of local timescale and entropy production analyses to cope with this problem. In particular, the framework of skeletal mechanism is in the focus of the study as a practical and most straightforward implementation strategy for reduced mechanisms. Hydrogen and methane/dimethyl ether reaction mechanisms are considered for illustration and validation purposes. Two skeletal mechanism versions were obtained for methane/dimethyl ether combustion system by varying the tolerance used to identify important reactions in the characteristic timescale analysis of the system. Comparisons of ignition delay times and species profiles calculated with the detailed and the reduced models are presented. The results of the application show transparently the potential of the suggested approach to be automatically implemented for the reduction of large chemical kinetic models. View Full-Text
Keywords: time scales analysis; entropy production; mechanism reduction; methane and hydrogen combustion time scales analysis; entropy production; mechanism reduction; methane and hydrogen combustion
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Porras, S.; Bykov, V.; Gol’dshtein, V.; Maas, U. Joint Characteristic Timescales and Entropy Production Analyses for Model Reduction of Combustion Systems. Entropy 2017, 19, 264.

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