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DNS of Near Wall Dynamics of Premixed CH$_4$/Air Flames

Zhang, Feichi; Zirwes, Thorsten ORCID iD icon; Häber, Thomas ORCID iD icon; Bockhorn, Henning; Trimis, Dimosthenis; Suntz, Rainer


This work presents a numerical study on the effect of flame-wall interaction (FWI) from the viewpoint of flame dynamics. For that purpose, direct numerical simulations (DNS) employing detailed calculations of reaction rates and transport coefficients have been applied to a 2D premixed methane/air flame under atmospheric condition. Free flame (FF) and side-wall quenching (SWQ) configurations are realized by defining one lateral boundary as either a symmetry plane for the FF or a cold wall with fixed temperature at 20 oC for the SWQ case. Different components of flame stretch and Markstein number regarding tangential, normal (due to curvature) and total stretch, Ka$_s$ , Ka$_c$ and Ka$_tot$ = Ka$_s$ + Ka$_c$, as well as their correlations with respect to the local flame consumption speed SL have been evaluated. It has been shown that the FWI zone is dominated by negative flame stretch. In addition, S$_L$ decreases with decreasing normal stretch due to curvature Ka$_c$ while approaching the cold wall. However, S$_L$ increases with decreasing Ka$_c$ while approaching the symmetry boundary for the free flame case, leading to an inversion of the Markstein number Ma$_tot$ based on Ka$_tot$ from positive in the free flame case to negative in the SWQ case. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000141925
Veröffentlicht am 17.01.2022
DOI: 10.23967/wccm-eccomas.2020.123
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Institut für Technische Chemie und Polymerchemie (ITCP)
Steinbuch Centre for Computing (SCC)
Universität Karlsruhe (TH) – Zentrale Einrichtungen (Zentrale Einrichtungen)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2696-6999
KITopen-ID: 1000141925
Erschienen in 14th WCCM-ECCOMAS Congress 2020: Collection of papers presented at the 14th edition of the WCCM-ECCOMAS, virtual congress, January, 11-15, 2021. Ed.: F. Chinesta
Verlag Scipedia S.L.
Schlagwörter Flame-wall interactions (FWI); Side-wall quenching (SWQ); Flame Dynamics; Markstein effect; Direct numerical simulation; OpenFOAM
Nachgewiesen in Scopus
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