非预混对向流混合层中近极限H$_2$-O$_2$-N$_2$燃烧
Near-limit H$_2$-O$_2$-N$_2$ combustion in nonpremixed counterflow mixing layers
AI总结：
通过详细化学数值模拟，研究了高稀释度氢氧对向流混合层中的近极限燃烧模式，识别出四种火焰类型和六种燃烧区域，并揭示了火焰构型的迟滞现象及多种稳态结构对初始条件的依赖性。
摘要：
采用详细化学机理的数值计算被用于表征在氮气稀释的氢气和氧气对向平面流之间的混合层中出现的不同燃烧模式。关注点集中在高稀释度上，由此产生近极限火焰，其峰值温度接近交叉温度。在以化学计量混合分数和归一化应变率为坐标的平面中给出了一个分岔图，该图识别出六种不同的燃烧区域，涉及四种不同的火焰类型，即扩散火焰面、前进和后退边缘火焰、多重火焰管以及单个孤立火焰管。多重管火焰构型从高应变率下的小型、圆形、间距较大的火焰串，变化到较低应变率下的宽而扁平、密集排列的火焰带，其间存在狭窄的无火焰间隙，并且它们在连续的管间距范围内以各种阵列形式保持稳态和稳定。所观察到的火焰行为在一定的参数范围内表现出迟滞现象，所建立的结构取决于点火机制，在高应变率下也是如此，并且存在一系列不同的稳定稳态火焰构型，每一种都从不同的初始条件进入。
英文摘要：
Numerical computations employing detailed chemistry are used to characterize the different combustion modes emerging in mixing layers separating nitrogen-diluted counterflowing planar streams of hydrogen and oxygen. Attention is focused on high degrees of dilution, resulting in near-limit flames, with peak temperatures close to the crossover temperature. A bifurcation diagram is presented in a plane, having the stoichiometric mixture fraction and normalized strain rate as coordinates, that identifies six different combustion regimes involving four different flame types, namely, diffusion-flame sheets, advancing and retreating edge flames, multiple flame tubes, and single isolated flame tubes. Multiple-tube flame configurations vary from small, round, widely separated flame strings at high strain rates to wide, flat, densely packed flame strips, with narrow flame-free gaps between them, at lower strain rates, and they are steady and stable in various arrays over a continuum of tube-separation distances. The observed flame behavior exhibits hysteresis in a certain range of parameters, with the structure that is established depending on the ignition mechanism, as it also does at high strain rates, and a continuum of different stable steady-state flame configurations exists, each accessed from a different initial condition.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
