Passage Times and Flamelet Crossing Frequencies in Premixed Turbulent Combustion
Passage Times and Flamelet Crossing Frequencies in Premixed Turbulent Combustion
复制标题
预混湍流燃烧中的通过时间和小焰交叉频率
DOI：
10.1080/00102208608923877
复制
发表时间：
1986
影响因子：
1.9
通讯作者：
P. Libby
中科院分区：
文献类型：
--
作者：
K. Bray;P. Libby
本文通过修正一个重要的模型假设，推广了先前对预混湍流火焰中平均反应速率特征尺度的分析。在以前的工作中，已燃烧和未燃烧的气体包的通过时间的分布是由一个指数概率密度函数，这是分析方便，但不适用于小的通过时间。目前的分析采用伽马2分布，消除了这一缺点，并在整个范围内的这些时间与有限的实验数据目前可用的协议。修正后的表达式得到的时间自相关函数的分布，平均反应速率和归一化的时间尺度通过一个平面火焰。需要进一步的实验来验证这些预测。
Abstract An earlier analysis of the characteristic scales associated with the mean reaction.rate in a premixed turbulent flame is extended by revising an important modeling assumption. In the previous work the distribution of passage times of burned and unburned gas packets is represented by an exponential probability density function which is analytically convenient but inapplicable at small passage times. The present analysis employs a gamma two distribution which removes this shortcoming and is in good agreement throughout the range of such times with the limited experimental data currently available. Modified expressions are obtained for the distributions of the time autocorrelation function, the mean reaction rate and the normalized time scale through a planar flame. Further experiments are required to test these predictions.