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DNS of Unsteady Flame-Wall Interaction

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

Abstract (englisch):

Direct numerical simulations (DNS) of unsteady side-wall quenching (SWQ) of stoichiometric premixed methane/air flames operated at atmospheric condition have been conducted. Objective of the work is to study the effect of transient, relative motion between the flame and the wall on the flame-wall interaction (FWI). A W-shaped plane-jet flame is considered, which is bounded in its lateral direction by two side walls. The unsteady motion of the flame is generated by using an oscillatory wall moving in its normal direction, with a pre-defined frequency $f$ and stroke length $L$ (distance between min/max wall normal locations). It has been found that the time-mean quenching distance $d_q$ and wall heat flux $\overline{\dot{q}}_w$ increase strongly with $f$ and $L$. In the case of weak flow disturbances with small $f$ and $L$, $d_q$ and $\overline{\dot{q}}_w$ yield a quasi-linear correlation with each other. However, a hysteresis loop for the correlation of $d_q$ and $\overline{\dot{q}}_w$ has been confirmed with increased $f$ and $L$, which is attributed to the delayed response of the flame to the unsteady fluctuations of the flow and temperature fields. ... mehr

Postprint §
DOI: 10.5445/IR/1000139420
Veröffentlicht am 01.01.2023
Cover der Publikation
Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Institut für Technische Chemie und Polymerchemie (ITCP)
Scientific Computing Center (SCC)
Universität Karlsruhe (TH) – Zentrale Einrichtungen (Zentrale Einrichtungen)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2021
Sprache Englisch
Identifikator KITopen-ID: 1000139420
HGF-Programm 38.05.01 (POF IV, LK 01) Anthropogenic Carbon Cycle
Weitere HGF-Programme 46.21.01 (POF IV, LK 01) Domain-Specific Simulation & SDLs and Research Groups
Erschienen in 30. Deutscher Flammentag, Deutsche Sektion des Combustion Institutes und DVV/VDI-Gesellschaft Energie und Umwelt. Ed.: F. Dinkelacker, H. Pitsch, V. Scherer
Veranstaltung 30. Deutscher Flammentag (2021), Hannover, Deutschland, 28.09.2021 – 29.09.2021
Seiten 1106-1115
Projektinformation SFB/TRR 150/2 (DFG, DFG KOORD, TRR 150/2 2019)
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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