Comparison of automatic reduction procedures for ignition chemistry

Terese Lövås, Per Amnéus, Fabian Mauss, E Mastorakos

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingResearchpeer-review

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Abstract

In this paper, we present a comparison between the reduced mechanisms obtained through a computational singular perturbation method (CSP) and the reduced mechanisms obtained through a lifetime analysis based only on the diagonal elements of the Jacobian matrix and a species sensitivity The two methods are used for the analysis of autoignition, which is an interesting test situation because of the sensitivity of ignition to the radical pool and the smaller range of timescales expected. It is found that the steady-state species selected by the two methods are in good agreement. The mechanisms are reduced to a 10-step mechanism when CSP is applied and an 11-step mechanism in the case of the simpler lifetime analysis. Both mechanisms are compared with the detailed mechanism and experimental data and are found to reproduce the physical and chemical parameters very well. This shows that for a large part of the timescale range, the system is close to linear. The comparison shows the advantage of the CSP method as being somewhat more accurate. However, the simpler lifetime analysis is of sufficient accuracy and of more convenience when applied to a system requiring a considerable reduction in computational time, as is the case when applying online reduction.
Original languageEnglish
Title of host publicationProceedings of the Combustion Institute
PublisherElsevier
Pages1387-1393
Volume29
DOIs
Publication statusPublished - 2002
EventTwenty-Ninth International Symposium on Combustion Hokkaido University Sapporo Japan - Sapporo, Japan
Duration: 2002 Jul 212002 Jul 25

Publication series

Name
Volume29
ISSN (Print)0082-0784

Conference

ConferenceTwenty-Ninth International Symposium on Combustion Hokkaido University Sapporo Japan
Country/TerritoryJapan
CitySapporo
Period2002/07/212002/07/25

Subject classification (UKÄ)

  • Atom and Molecular Physics and Optics

Keywords

  • Ignition chemistry

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