Three-dimensional topology of turbulent premixed flame interaction
Three-dimensional topology of turbulent premixed flame interaction
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DOI：
10.1016/j.proci.2014.08.003
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发表时间：
2015-01-01
影响因子：
3.4
通讯作者：
Kollmann, W.
中科院分区：
文献类型：
--
作者：
Griffiths, R. A. C.;Chen, J. H.;Kollmann, W.
湍流预混火焰的拓扑结构进行了分析，使用直接数值模拟（DNS）的数据，重点是统计几何火焰相互作用。概述了获得线，面和体积场的临界点的一般方法，该方法适用于DNS配置中的反应进程变量的等值面，涉及一对自由传播的氢-空气火焰在激烈的剪切产生的湍流场。一套完整的可能的火焰相互作用的拓扑结构推导出使用标量海森的特征值，和拓扑结构参数化使用一对形状因子。每种拓扑类型的出现频率都是从DNS数据集中针对两个不同的Damkohler数进行评估的。不同类型的火焰相互作用的拓扑结构被发现有利于在各个区域的湍流火焰，和每个相互作用的物理意义进行了讨论。(C)由Elsevier Inc.出版。代表燃烧研究所
The topology of turbulent premixed flames is analysed using data from Direct Numerical Simulation (DNS), with emphasis on the statistical geometry of flame-flame interaction. A general method for obtaining the critical points of line, surface and volume fields is outlined, and the method is applied to isosurfaces of reaction progress variable in a DNS configuration involving a pair of freely-propagating hydrogen-air flames in a field of intense shear-generated turbulence. A complete set of possible flame-interaction topologies is derived using the eigenvalues of the scalar Hessian, and the topologies are parametrised using a pair of shape factors. The frequency of occurrence of each type of topology is evaluated from the DNS dataset for two different Damkohler numbers. Different types of flame-interaction topology are found to be favoured in various regions of the turbulent flame, and the physical significance of each interaction is discussed. (C) 2014 Published by Elsevier Inc. on behalf of The Combustion Institute.