# DNS of Unsteady Flame-Wall Interaction

Zhang, Feichi; Zirwes, Thorsten; Häber, Thomas; 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

 Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)Steinbuch Centre for Computing (SCC)Institut für Technische Chemie und Polymerchemie (ITCP) Publikationstyp Proceedingsbeitrag Publikationsjahr 2021 Sprache Englisch Identifikator KITopen-ID: 1000139420 HGF-Programm 38.05.01 (POF IV, LK 01) Anthropogenic Carbon Cycle Erschienen in 30. Deutscher Flammentag, Deutsche Sektion des Combustion Institutes und DVV/VDI-Gesellschaft Energie und Umwelt Dinkelacker, Friedrich; Pitsch Heinz; Scherer, Viktor (eds.) Veranstaltung 30. Deutscher Flammentag (2021), Hannover, Deutschland, 28.09.2021 – 29.09.2021 Seiten 1106-1115 Projektinformation TRR 150/2 (DFG, DFG KOORD, TRR 150/2 2019)
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