Dynamics analysis of a turbulent methane flame in MILD combustion conditions

Dimitris M. Manias, Efstathios Al Tingas, Hong G. Im, Yuki Minamoto

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1 Citation (Scopus)

Abstract

The dominant physical processes that characterize the combustion of a lean methane/air mixture, diluted with exhaust gas recirculation (EGR), under turbulent MILD premixed conditions are identified using the combined approaches of Computational Singular Perturbation (CSP) and Tangential Strech Rate (TSR) which identifies the driving processes of the system dynamics. The important modes that contribute the most to the TSR are identified and the competition between the processes that oppose to or promote the action of each mode is studied. Two important modes are found to compete for the largest part of the domain, one of explosive character and one of dissipative nature. This competition mostly favors the dissipative modes, suggesting that the system’s dynamics is predominantly dominant. It was also found that the key processes that trigger this competition are hydrogen-related reactions introduced by the explosive mode and carbon-related reactions introduced by dissipative modes. Furthermore, it was also found that the chemical activity of the explosive modes is enhanced by transport processes, in particular convective processes, despite their dissipative nature.

Original languageEnglish
Title of host publicationAIAA Scitech 2019 Forum
Place of PublicationSan Diego, California
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105784
DOIs
Publication statusPublished - 7 Jan 2019
EventAIAA Scitech Forum, 2019 - San Diego, United States
Duration: 7 Jan 201911 Jan 2019

Publication series

NameAIAA Scitech 2019 Forum

Conference

ConferenceAIAA Scitech Forum, 2019
CountryUnited States
CitySan Diego
Period7/01/1911/01/19

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Manias, D. M., Tingas, E. A., Im, H. G., & Minamoto, Y. (2019). Dynamics analysis of a turbulent methane flame in MILD combustion conditions. In AIAA Scitech 2019 Forum (AIAA Scitech 2019 Forum). San Diego, California: American Institute of Aeronautics and Astronautics Inc, AIAA. https://doi.org/10.2514/6.2019-1731