Linear-eddy modelling of turbulent transport. Part 7. Finite-rate chemistry and multi-stream mixing
Linear-eddy modelling of turbulent transport. Part 7. Finite-rate chemistry and multi-stream mixing
复制标题
湍流传输的线性涡流建模。
DOI：
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发表时间：
1992
影响因子：
3.7
通讯作者：
A. Kerstein
中科院分区：
文献类型：
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作者：
A. Kerstein
线性涡湍流混合模型，制定捕捉湍流对流和分子输运的扩散标量湍流混合的不同影响，适用于两个混合配置在均匀流：标量混合层和双线源配置。速率二级化学反应被认为是，以及快速反应和冻结流的限制。计算结果进行了比较，在反应标量混合层中的测量，并在两个线源配置涉及被动标量混合。对于每种配置，调整一个单一的模型参数有关的湍流积分尺度产生良好的协议与各种测量量的计算结果。结果解释参考一个更简单的模型，仅基于大规模的扑翼效应，再现许多定性的趋势。对于三股流混合与有限速率化学，一个新的依赖关系的反应物相关系数的化学反应速率的预测。
The linear-eddy turbulent mixing model, formulated to capture the distinct influences of turbulent convection and molecular transport on turbulent mixing of diffusive scalars, is applied to two mixing configurations in homogeneous flow: a scalar mixing layer and a two-line-source configuration. Finite-rate second-order chemical reactions are considered, as well as the limits of fast reaction and frozen flow. Computed results are compared to measurements in a reacting-scalar mixing layer and in a two-line-source configuration involving passive-scalar mixing. For each configuration, the adjustment of a single model parameter related to the turbulence integral scale yields computed results in good agreement with a variety of measured quantities. The results are interpreted with reference to a simpler model, based solely on large-scale flapping effects, that reproduces many qualitative trends. For three-stream mixing with finite-rate chemistry, a novel dependence of the reactant correlation coefficient on the chemical reaction rate is predicted.