Edge flames are of fundamental importance to the attachment and stabilization of diffusion flames in many practical devices, and serve as transient structures for establishing combustion in locally-quenched regions of turbulent diffusion flames. In this study, we consider an edge flame sustained in the mixing layer of two streams, one containing fuel and the other oxidizer, and examine its structure and its thermal and dynamic properties over a wide range of flow conditions, using a diffusive-thermal (constant-density) model. In addition, we allow for the fuel Lewis number to vary from sub- to super-unity values, corresponding to light and moderately heavy fuels, or fuels suitably diluted by inert species, with unity oxidizer Lewis number as appropriate for combustion in air. Two regimes have been identified and examined; a thermal-interaction regime where there is appreciable heat loss from the edge flame to the splitter plate, and a freely-standing regime where the edge flame lifts off considerably and the plate plays no role on its stabilization. The objective is to correlate important edge-flame properties, including standoff distance and edge speed and temperature, with global parameters such as overall flow rate and total heat conducted from the flame to the plate, and local parameters such as local mixture fraction gradient at the edge of the flame.

边缘火焰对于扩散火焰在许多实际设备中的附着和稳定至关重要，并且是在湍流扩散火焰的局部淬火区域建立燃烧的瞬态结构。在这项研究中，我们考虑了两种燃料（一种包含燃料和另一种氧化剂）的混合层中维持的边缘火焰，并使用扩散热（恒定密度）模型。此外，我们允许燃料的路易斯值从亚单位到超统一值变化，对应于轻度和中等程度的燃料，或由惰性物质适当稀释的燃料，单位氧化剂路易斯数适合在空气中燃烧。确定和审查了两种制度；一个热相互作用状态，其中从边缘火焰到分流板有相当多的热量损失；而一个独立的状态，其中边缘火焰显着升起，并且板对其稳定不起任何作用。目的是使重要的边缘火焰特性（包括间隔距离，边缘速度和温度）与全局参数（例如从火焰传递到板的总流量和总热量）以及局部参数（例如局部混合分数梯度）相关联。火焰的边缘。