Flamelet models of turbulent non-premixed combustion
Flamelet models of turbulent non-premixed combustion
复制标题
湍流非预混燃烧的小火焰模型
DOI：
10.1080/00102208108946973
复制
发表时间：
1981
影响因子：
1.9
通讯作者：
S. K. Liew
中科院分区：
文献类型：
--
作者：
S. K. Liew
本文描述了湍流非预混火焰热力学状态的小火焰模型，其中湍流系综中的微观元素具有无扰动层流扩散火焰的结构。通过这个火焰的标量属性的配置文件唯一地定义瞬时混合物状态，因此提供了一个替代的热化学关系的化学平衡，通常用于流场计算。通过使用已发表的湍流火焰中的平均温度和RMS温度波动的测量值来确定必要的混合物分数统计数据，从而可以适当地平均瞬时层流小火焰组合物剖面，从而避免了对流场模型的需要，并在文献中报道了使用替代热化学假设的物种预测和实验之间的比较。在预测的显着改善是在一个开放的湍流火焰的富燃料区域，特别是在敏感的…
Abstract A flamelet model for thermodynamic state in turbulent non-premixed flames is described in which the microscopic element in the turbulent ensemble has the structure of an undisturbed laminar diffusion flame. The profiles of scalar properties through this flame uniquely define instantaneous mixture state and hence provide an alternative thermochemical relationship to that of chemical equilibrium, commonly employed in flowfield calculations. The need for a flowfield model is avoided by using published measurements of mean temperature and RMS temperature fluctuation in a turbulent flame to determine the necessary mixture fraction statistics, so that the instantaneous laminar flamelet composition profiles can be appropriately averaged.Comparison is made between species prediction using the alternative thermochemical assumptions, and experiments as reported in the literature. Substantial improvements in prediction are achieved in the fuel-rich regions of an open turbulent flame, notably in the sensitiv...