The mechanism by which CH2O and H2O2 additives affect the autoignition of CH4/air mixtures

Dimitris M. Manias, Efstathios Al Tingas, Christos E. Frouzakis, Konstantinos Boulouchos, Dimitris A. Goussis

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

When the fast dissipative time scales become exhausted, the evolution of reacting processes is characterized by slower time scales. Here the case where these slower time scales are of explosive character is considered. This feature allows for the acquisition of significant physical understanding; among others, the identification of intermediates in the reacting process that can be used as additives for the control of the ignition delay. The case of the homogeneous autoignition of CH4/air mixtures is analyzed here and the effects of adding the stable intermediates CH2O and H2O2 to the fuel. These two species are identified as those relating the most to the explosive mode that causes autoignition, throughout the largest part of the ignition delay. Small quantities of these species in the initial mixture decrease considerably the ignition delay, by expediting the development of the thermal runaway.

Original languageEnglish
Pages (from-to)111-125
Number of pages15
JournalCombustion and Flame
Volume164
DOIs
Publication statusPublished - 1 Feb 2016

Keywords

  • CSP
  • Explosive time scales
  • Methane/air autoignition
  • Model reduction

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