Scalar structure of turbulent stratified swirl flames conditioned on local equivalence ratio
Scalar structure of turbulent stratified swirl flames conditioned on local equivalence ratio
复制标题
局部当量比条件下湍流分层旋流火焰的标量结构
DOI：
10.1016/j.combustflame.2016.01.001
复制
发表时间：
2016
影响因子：
4.4
通讯作者：
S. Hochgreb
中科院分区：
文献类型：
--
作者：
M. M. Kamal;R. Barlow;S. Hochgreb
在最近的一篇论文（Kamal, et al., 2015）中，我们通过对局部等效比的调节测量，重新分析了在剑桥/桑迪亚分层燃烧器上稳定的非旋转火焰的单枪种类和温度测量，发现火焰的状态空间结构与给定等效比下层流火焰的状态空间结构非常接近。在本研究中，我们发现CH4、O2、H2O和co2在高旋流下的预混合和分层火焰中仍然具有相同的状态空间关系。条件有限公司质量分数和H2in分层火焰漩涡显示分层的影响大于non-swirling中观察到的情况下,这是由于在等价比率较大的梯度,出现的漩涡。除了这种适度的分层效应外，旋涡火焰中的主要物种质量分数也与层流火焰在局部等效比下的结果非常接近。
In a recent paper (Kamal, et al., 2015), we reanalyzed single shot species and temperature measurements from non-swirling flames stabilized on the Cambridge/Sandia stratified burner by conditioning measurements on the local equivalence ratio, and found that the state space structure of the flames was closely approximated by that of a laminar flame at the given equivalence ratio. In the present communication, we show that the same state space relationships remain robust for species CH4, O2, H2O, and CO2in premixed and stratified flames under high swirl. Conditioned mass fractions of CO and H2in the stratified swirl flame show a greater effect of stratification than was observed in the non-swirling cases, and this is attributed to larger gradients in equivalence ratio that occur with the addition of swirl. Aside from this modest effect of stratification, major species mass fractions in the swirling flame are also closely approximated by laminar flame results at the local equivalence ratio.