Effects of strain rate and curvature on surface density function transport in turbulent premixed flames in the thin reaction zones regime
Effects of strain rate and curvature on surface density function transport in turbulent premixed flames in the thin reaction zones regime
复制标题
DOI：
10.1063/1.1923047
复制
发表时间：
2005-06
影响因子：
4.6
通讯作者：
N. Chakraborty;R. Cant
中科院分区：
文献类型：
--
作者：
N. Chakraborty;R. Cant
采用单步Arrhenius型化学方法研究了应变速率和曲率对薄反应区表面密度函数（SDF）输运的影响。结果表明，当火焰等值面上的切向应变率超过临界值时，会诱发负的法向应变率，使等值线相互靠近，从而导致更高的SDF值。这体现在SDF与切向应变率呈正相关。曲率也通过在给定的火焰等值面上切向应变率和曲率之间的相关性发现了对SDF的影响。发现应变率和曲率对SDF输运方程的各项有明显的影响。SDF应变项与切向应变率呈正相关，与曲率呈负相关。组合的SDF曲率和传播项作为一个源…
Strain rate and curvature effects on Surface Density Function (SDF) transport in the thin reaction zones regime are studied using a three-dimensional direct numerical simulations (DNS) with a single-step Arrhenius type chemistry. It is shown that if the tangential strain rate on a flame isosurface exceeds a critical value, then a negative normal strain rate is induced, which acts to bring the isoscalar lines closer to each other and hence leads to a higher value of SDF. This is reflected in a positive correlation between SDF and tangential strain rate. Curvature is also found to affect SDF through the correlation between tangential strain rate and curvature on a given flame isosurface. Strain rate and curvature are found to have an appreciable effect on various terms of the SDF transport equation. The SDF straining term is correlated positively with tangential strain rate as expected and is also correlated negatively with the curvature. The combined SDF curvature and propagation terms operate as a source ...