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Numerical Simulations of Turbulent Flame Propagation in a Fan-Stirred Combustion Bomb and Bunsen-Burner at Elevated Pressure

Zhang, Feichi; Zirwes, Thorsten; Habisreuther, Peter; Zarzalis, Nikolaos; Bockhorn, Henning; Trimis, Dimosthenis

Abstract:
Large eddy simulations (LES) have been carried out to calculate turbulent flame propagation in a fan-stirred combustion bomb and a Bunsen-type burner. Objective of the work is to reveal the main mechanism of increased flame wrinkling due to elevated pressure and to assess the ability of the turbulent flame-speed closure (TFC-class) combustion model to reproduce the enhancement of flame wrinkling or burning rate at elevated pressures. The simulations have been performed for a premixed methane/air mixture at equivalence ratio 0.9 and the pressure has been varied from 1 bar to 5 bar. The turbulent kinetic energy is found to increase with pressure in the high frequency range, indicating reinforced small-scale turbulent fluctuations at elevated pressure. The reason is attributed to the increased turbulent Reynolds number with pressure, which shifts the turbulent energy spectra to the higher wave number range. A reinforced flame wrinkling and an increased total burning rate are obtained at elevated pressure, which is in accordance with results from previous high-pressure combustion experiments. In addition, applying the same method to a quiescent flow in the bomb vessel reveals a decrease of the overall burning rate with pressure, which agrees with the behaviour of laminar flame speed at elevated pressures. ... mehr

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Postprint §
DOI: 10.5445/IR/1000123520
Frei zugänglich ab 01.09.2022
Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Steinbuch Centre for Computing (SCC)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 20.08.2020
Sprache Englisch
Identifikator ISSN: 0003-6994, 0365-7140, 1386-6184, 1573-1987, 1872-8065, 2212-0939
KITopen-ID: 1000123520
HGF-Programm 34.14.02 (POF III, LK 01) Vergasung
Erschienen in Flow, turbulence and combustion
Verlag Springer Verlag
Band 106
Seiten 925–944
Nachgewiesen in Dimensions
Web of Science
Scopus
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