Influence of flame geometry on turbulent premixed flame propagation: a DNS investigation
Influence of flame geometry on turbulent premixed flame propagation: a DNS investigation
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火焰几何形状对湍流预混火焰传播的影响：DNS 研究
DOI：
10.1017/jfm.2012.328
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发表时间：
2012
影响因子：
3.7
通讯作者：
Dunstan T
中科院分区：
文献类型：
--
作者：
Dunstan T
通过对三种典型配置中的湍流预混火焰进行直接数值模拟，研究了湍流火焰速度对火焰几何形状的敏感性：自由传播的统计平面火焰、停滞流中稳定的平面火焰和棒稳定的 V 型火焰。我们考虑消耗速度（测量燃烧的综合速率）和传播速度（测量火焰刷内等值面的速度）。火焰刷前缘传播速度的代数模型（该模型与火焰几何形状无关）也应用于数据，以确定其有效性范围及其失败原因。发现湍流消耗速度强烈依赖于几何形状，这主要是由于火焰刷厚度的持续增长。发现瞬时火焰锋的结构和消耗速度的变化对火焰几何形状仅很弱敏感。湍流传播速度根据其反应性、扩散性和湍流通量分量进行分析。通过火焰刷和沿着前缘，所有这三个项都被证明是重要的。研究发现，仅在某些条件下的 V 型火焰中，前沿传播速度对火焰几何形状敏感。有人认为，模型无法捕获的这种明显的几何依赖性是由这些特定情况下的湍流和平均流动时间尺度之间的关系产生的，而不是火焰几何形状本身所固有的。
The sensitivity of the turbulent flame speed to the geometry of the flame is investigated using direct numerical simulations of turbulent premixed flames in three canonical configurations: freely propagating statistically planar flames, planar flames stabilized in stagnating flows, and rod-stabilized V-flames. We consider both the consumption speed, which measures the integrated rate of burning, and the propagation speed, which measures the speed of an isosurface within the flame brush. An algebraic model for the propagation speed of the leading edge of the flame brush, which is blind to flame geometry, is also applied to the data for the purposes of establishing its range of validity and the causes of its failure. The turbulent consumption speed is found to be strongly geometry dependent, primarily due to the continuous growth of the flame brush thickness. Changes in the structure and consumption speed of instantaneous flame fronts are found to be only weakly sensitive to flame geometry. The turbulent propagation speed is analysed in terms of its reactive, diffusive and turbulent flux components. All three terms are shown to be significant, both through the flame brush and along the leading edge. The leading-edge propagation speed is found to be sensitive to flame geometry only in the V-flames under certain conditions. It is suggested that this apparent geometry dependence, which the model cannot capture, results from the relation between the turbulence and mean flow time scales in these particular cases, and is not intrinsic to the flame geometry itself.
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DOI：
--
发表时间：
2005
期刊：
影响因子：
--
作者：
A. Lipatnikov;J. Chomiak
通讯作者：
J. Chomiak
勘误表：使用直接数值模拟测量静态预混 V 型火焰的几何特性和湍流火焰速度
DOI：
10.1007/s10494-010-9304-1
发表时间：
2010
期刊：
Flow, Turbulence and Combustion
影响因子：
--
作者：
Dunstan T
通讯作者：
Dunstan T
影响因子：
4.4
作者：
Chakraborty, Nilanjan;Cant, R. S.
通讯作者：
Cant, R. S.
DOI：
10.1007/s10494-010-9284-1
发表时间：
2011-12
期刊：
Flow, Turbulence and Combustion
影响因子：
--
作者：
T. Dunstan;N. Swaminathan;K. Bray;R. Cant
通讯作者：
T. Dunstan;N. Swaminathan;K. Bray;R. Cant
在初始温度下反应的物质中的火焰传播
DOI：
--
发表时间：
1980
期刊：
影响因子：
--
作者：
Y. Zeldovich
通讯作者：
Y. Zeldovich