Topology of pocket formation in turbulent premixed flames

被引：17
|
作者：
Trivedi, S. [1 ]
Griffiths, R. [1 ]
Kolla, H. [2 ]
Chen, J. H. [2 ]
Cant, R. S. [1 ]
机构：
[1] Univ Cambridge, Dept Engn, Cambridge CB2 1PZ, England
[2] Sandia Natl Labs, Combust Res Facil, Livermore, CA 94550 USA
来源：
PROCEEDINGS OF THE COMBUSTION INSTITUTE | 2019年 / 37卷 / 02期
基金：
英国工程与自然科学研究理事会;
关键词：
Direct numerical simulation; Turbulent premixed flames; Flame surface topology; Pocket formation;
D O I：
10.1016/j.proci.2018.06.197
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
In turbulent premixed flame propagation, the formation of isolated pockets of reactants or products is associated with flame pinch-off events which cause rapid changes in the flame surface area. Previous topological analysis of these phenomena has been carried out based on Morse theory and Direct Numerical Simulation (DNS) in two spatial dimensions. The present work extends the topological analysis to three dimensions with emphasis on the formation and subsequent burnout of reactant pockets. Singular behaviour observed previously for terms of the Surface Density Function (SDF) transport equation in the two-dimensional case is shown to occur also in three dimensions. Further singular behaviour is observed in the displacement speed close to reactant pocket burnout. The theory is compared against DNS data from hydrogen-air flames and good agreement is obtained. (C) 2018 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
引用
收藏
页码：2619 / 2626
页数：8
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