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国际多尺度计算工程期刊

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ISSN 打印: 1543-1649

ISSN 在线: 1940-4352

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 1.4 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 1.3 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 2.2 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00034 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.46 SJR: 0.333 SNIP: 0.606 CiteScore™:: 3.1 H-Index: 31

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The Rate-Controlled Constrained Equilibrium (RCCE) Method for Reducing Chemical Kinetics in Systems with Time-Scale Separation

卷 5, 册 1, 2007, pp. 11-18
DOI: 10.1615/IntJMultCompEng.v5.i1.20
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摘要

Turbulent combustion is the ultimate multiscale problem, with chemical reactions exhibiting time scales spanning more than ten orders of magnitude and turbulent motion, introducing further space and time scales. The integration of the chemical kinetics equations is severely hampered by their excessive stiffness, resulting from the range of time scales present. The mathematical modeling of combustion can be significantly simplified by taking advantage of the time-scale separation to assume that fast reactions, typically associated with intermediate species, are in a local equilibrium. In the rate-controlled constrained equilibrium method (RCCE), the dynamical evolution of the system is governed by the kinetics of the species associated with the slower time scales (kinetically controlled), while the remaining species are calculated via a constrained minimization of the Gibbs free energy of the mixture. This permits the derivation of a general set of differential-algebraic equations (DAEs), which apply to any reduced system given a particular selection of kinetically controlled species. In this paper, it is shown how the differential-algebraic formulation of RCCE can be derived from first principles, in the form of an extension of the computation of chemical equilibrium via miminisation of the free energy. Subsequently, RCCE is employed to reduce a comprehensive combustion mechanism and to calculate the burning velocity of premixed H2-O2 and CH4-air flames under a range of pressures and equivalence ratios.

对本文的引用
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