Large eddy simulation subfilter modeling of soot-turbulence interactions
Large eddy simulation subfilter modeling of soot-turbulence interactions
复制标题
烟灰-湍流相互作用的大涡模拟子过滤器建模
DOI：
10.1063/1.3657826
复制
发表时间：
2011
影响因子：
4.6
通讯作者：
H. Pitsch
中科院分区：
文献类型：
--
作者：
M. Mueller;H. Pitsch
湍流、化学和烟尘之间的小尺度相互作用对湍流反应流中烟尘的形成、增长和破坏过程有着深刻的影响。在这项工作中，湍流和烟尘之间的小尺度子过滤器的相互作用建模使用一个假定的子过滤器PDF的烟尘数密度函数的统计矩。由于非常大（无限）的施密特数，烟灰被限制在非常薄的结构中。此外，碳烟最初是由多环芳烃形成的，多环芳烃对流场中的局部标量耗散率表现出很强的敏感性。烟尘与气相化学、分子输运和湍流的这些相互作用导致非常高的空间和时间不稳定性。因此，假定碳烟子过滤器PDF是具有碳烟生成模式和非碳烟生成模式的一对δ分布。除了标量的平均值之外，还需要一个额外的参数来指定此分布。新闻中心
The small-scale interactions between turbulence, chemistry, and soot have a profound effect on the soot formation, growth, and destruction processes in turbulent reacting flows. In this work, the small-scale subfilter interactions between turbulence and soot are modeled using a presumed subfilter PDF for the statistical moments of the soot number density function. Due to a very large (infinite) Schmidt number, soot is confined to very thin structures. In addition, soot is formed initially from Polycyclic Aromatic Hydrocarbons, which exhibit a strong sensitivity to the local scalar dissipation rate in the flow field. These interactions of soot with the gas-phase chemistry, molecular transport, and turbulence result in very high spatial and temporal intermittency. Therefore, the soot subfilter PDF is presumed to be a pair of delta distributions with a sooting mode and a non-sooting mode. In addition to the mean values of the scalars, one additional parameter is needed to specify this distribution. The presu...