CUED Publications database

DNS of EGR-type turbulent flame in MILD condition

Minamoto, Y and Dunstan, TD and Swaminathan, N and Cant, RS (2013) DNS of EGR-type turbulent flame in MILD condition. Proceedings of the Combustion Institute, 34. pp. 3231-3238. ISSN 1540-7489

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Abstract

Three-dimensional direct numerical simulation (DNS) of exhaust gas recirculation (EGR)-type turbulent combustion operated in moderate and intense low-oxygen dilution (MILD) condition has been carried out to study the flame structure and flame interaction. In order to achieve adequate EGR-type initial/inlet mixture fields, partially premixed mixture fields which are correlated with the turbulence are carefully preprocessed. The chemical kinetics is modelled using a skeletal mechanism for methane-air combustion. The results suggest that the flame fronts have thin flame structure and the direct link between the mean reaction rate and scalar dissipation rate remains valid in the EGR-type combustion with MILD condition. However, the commonly used canonical flamelet is not fully representative for MILD combustion. During the flame-flame interactions, the heat release rate increases higher than the maximum laminar flame value, while the gradient of progress variable becomes smaller than laminar value. It is also proposed that the reaction rate and the scalar gradient can be used as a marker for the flame interaction. © 2012 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

Item Type: Article
Uncontrolled Keywords: Direct numerical simulation (DNS) Exhaust gas recirculation (EGR) Flameless combustion Moderate and intense low-oxygen dilution (MILD) Turbulent premixed flame
Subjects: UNSPECIFIED
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:21
Last Modified: 08 Dec 2014 02:21
DOI: 10.1016/j.proci.2012.06.041