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LES of turbulent partially-premixed flames using reaction–diffusion manifold-reduced chemistry with a consistent gradient estimate determined “on the fly”

Shrotriya, Prashant 1; Schießl, Robert 1; Bykov, Viatcheslav ORCID iD icon 1; Maas, Ulrich 1
1 Institut für Technische Thermodynamik (ITT), Karlsruher Institut für Technologie (KIT)

Abstract:

This paper devises and applies a method for determining consistent, system-adapted reaction–diffusion manifolds (REDIM) for turbulent partially-premixed combustion. The method is an extension of a previous technique which was limited to laminar flames. It adapts a REDIM to the scalar gradients present in a given reacting flow by an iterative procedure, in which gradients from REDIM-reduced simulations are used to create a new and improved REDIM. An application of the method is demonstrated using large eddy simulations (LES) of a turbulent partially-premixed methane/air flame as the “gradient estimate generating” flame simulation. Compared to the previous laminar flame studies, the turbulent flame features less sharp gradient-scalar correlations because of the strong scattering of data. Methods for capturing the scatter in scalar-gradient correlations are applied, allowing us to assess the influence of the scatter on the resulting REDIM. Also, the fact that turbulent flame simulations often involve spatial filtering operations which tend to reduce the magnitude of the gradients is taken into account by comparing the REDIM output to quasi-direct numerical simulation (qDNS) data. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000172508
Veröffentlicht am 15.07.2024
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Thermodynamik (ITT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2024
Sprache Englisch
Identifikator ISSN: 1540-7489
KITopen-ID: 1000172508
Erschienen in Proceedings of the Combustion Institute
Verlag Elsevier
Band 40
Heft 1-4
Seiten Art-Nr.: 105273
Vorab online veröffentlicht am 24.06.2024
Nachgewiesen in Web of Science
Dimensions
Scopus
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