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Energies 2018, 11(7), 1902; https://doi.org/10.3390/en11071902

The Eddy Dissipation Concept—Analysis of Different Fine Structure Treatments for Classical Combustion

1
Institute of Chemical, Environmental & Bioscience Engineering, Technische Universität Wien, Getreidemarkt 9/166, 1060 Vienna, Austria
2
K1-MET GmbH, Stahlstraße 14, 4020 Linz, Austria
Current address: Institute of Chemical, Environmental & Bioscience Engineering, Technische Universität Wien, Getreidemarkt 9/166, 1060 Vienna, Austria.
*
Author to whom correspondence should be addressed.
Received: 12 June 2018 / Revised: 9 July 2018 / Accepted: 19 July 2018 / Published: 20 July 2018
(This article belongs to the Section Energy Fundamentals and Conversion)
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Abstract

The Eddy Dissipation Concept (EDC) is common in modeling turbulent combustion. Several model improvements have been proposed in literature; recent modifications aim to extend its validity to Moderate or Intense Low oxygen Dilution (MILD) conditions. In general, the EDC divides a fluid into a reacting and a non-reacting part. The reacting part is modeled as perfectly stirred reactor (PSR) or plug flow reactor (PFR). EDC theory suggests PSR treatment, while PFR treatment provides numerical advantages. Literature lacks a thorough evaluation of the consequences of employing the PFR fine structure treatment. Therefore, these consequences were evaluated by employing tests to isolate the effects of the EDC variations and fine structure treatment and by conducting a Sandia Flame D modeling study. Species concentration as well as EDC species consumption/production rates were evaluated. The isolated tests revealed an influence of the EDC improvements on the EDC rates, which is prominent at low shares of the reacting fluid. In contrast, PSR and PFR differences increase at large fine fraction shares. The modeling study revealed significant differences in the EDC rates of intermediate species. Summarizing, the PFR fine structure treatment might be chosen for schematic investigations, but for detailed investigations a careful evaluation is necessary. View Full-Text
Keywords: Eddy Dissipation Concept (EDC); turbulent combustion; plug flow reactor (PFR); perfectly stirred reactor (PSR); reactive flow modeling; Sandia Flame D; OpenFOAM®; computational fluid dynamics (CFD); fine structure treatment/closure Eddy Dissipation Concept (EDC); turbulent combustion; plug flow reactor (PFR); perfectly stirred reactor (PSR); reactive flow modeling; Sandia Flame D; OpenFOAM®; computational fluid dynamics (CFD); fine structure treatment/closure
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Bösenhofer, M.; Wartha, E.-M.; Jordan, C.; Harasek, M. The Eddy Dissipation Concept—Analysis of Different Fine Structure Treatments for Classical Combustion. Energies 2018, 11, 1902.

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