中文摘要：

直接数字的模拟被采用调查甲烷的 premixed 喷气火焰在瘦，包括 17 种类和 58 元素的步和不同路易斯数字与详细化学动力学结合了。在 0.55 等价比率的冷甲烷空气混合与 9500 雷纳兹数字被注入 coflow 区域。周围的气体被设置是在主要喷气和温度的甲烷空气混合的烧的气体的 coflow 被分配是相应断热的火焰温度 1515 K。整个模拟进程基于 paralleled 计算方法被运用，并且化学来源被动态地把 CHEMKIN 称为图书馆功能获得。在 6.98 ms 的火焰结构被显示在旋涡运动上表明火焰结构和反应率的明显的依赖。然后由跟踪在不同火焰元素和旋涡之间的相互作用，在这依赖后面的机制被发现。包括表面密度功能，吝啬的弯曲和段率的概念被用来描述影响旋涡的火焰的几何结构。那些都根据模拟结果被计算并且统计上与显示反应紧张的热版本率联系了。统计结果证明那表面密度功能和反应率拥有直接积极的关联；有更大的弯曲大小的大部分起皱的火焰趋于变得厚并且削弱表面密度功能和反应率，显得本地扑灭现象；在火焰上施加的大正切的段率通常在使反应率加强的正常生产本地变瘦效果。介绍的 DNS 将为狂暴的 premixed 燃烧供应有益的参考书到火焰旋涡相互作用的更好的理解和更多的精确一般模型的开发。

英文摘要：

Direct numerical simulation is employed to investigate the premixed jet flame of methane in lean, combined with a detailed chemical kinetics including 17 species and 58 elemental steps and distinct Lewis numbers. Cold methane-air mixture at 0.55 equivalence ratio is injected into the coflow area with 9500 Reynolds number. The coflow ambient gas is set to be the burnt gas of the methane-air mixture in main jet and temperature is assigned to be the corresponding adiabatic flame temperature 1515 K. The whole simulation process is run based on paralleled calculation method, and chemical sources are acquired by dynamically calling CHEMKIN library function. The flame structure at 6.98 ms is shown to demonstrate the obvious dependence of flame structure and reaction rate on vortices motion. Then by tracing the interaction between different flame elements and vortices, the mechanism behind this dependence is found. The concepts including surface density function, mean curvature and stretch rate are used to describe the geometrical structure of vortex-affected flame. Those are all calculated according to simulation result and statistically associated with heat release rate that indicates reaction intensity. The statistical results show that surface density function and reaction rate own direct positive correlation; largely wrinkled flames with greater curvatures magnitude tend to become thick and weaken surface density function and reaction rate, appearing local extinction phenomena; large tangential stretch rates exerted on flame usually produce a local thinning effect in normal making reaction rate intensified. The DNS presented will supply beneficial references to better understanding of flame-vortex interaction and development of more accurate general model for turbulent premixed combustion.