Flame-flame interactions are analyzed in twin hydrocarbon and hydrogen turbulent premixed flames. The interactions are identified with the help of Morse theory for critical points. Flame topology in the vicinity of critical points is analyzed and is categorized into four main groups, namely tunnel formation, tunnel closure, reactant pockets, and product pockets. The number of flame-flame interactions is presented in the form of histograms for the different flame cases. The relative frequency of occurrence of each type of topology changes with the turbulence intensity. In hydrocarbon flames, the fraction of product pockets and tunnel formation events increases with turbulence intensity, whereas the fraction of reactant pockets and tunnel closure events decreases. The results for hydrocarbon flames are compared with those for hydrogen flames and the differences are explained both qualitatively and quantitatively. An additional comparison is made between the number of flame-flame interactions observed for a single hydrocarbon flame against the number of interactions for twin hydrocarbon flames. It is found that having two flames in the domain does not significantly alter the number of interactions per flame, therefore indicating that the observed interactions are mainly self-interactions within individual flames.

中文翻译：

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预混烃和氢火焰中火焰与火焰的相互作用分析

在双烃和氢湍流预混火焰中分析了火焰-火焰相互作用。借助莫尔斯理论对关键点进行识别。对关键点附近的火焰拓扑进行了分析，并将其分为四个主要组，即隧道形成，隧道封闭，反应物袋和产物袋。火焰-火焰相互作用的次数以直方图的形式表示在不同的火焰情况下。每种类型拓扑的相对出现频率都随湍流强度而变化。在碳氢化合物火焰中，产物袋和通道形成事件的比例随湍流强度增加，而反应物袋和通道关闭事件的比例降低。将碳氢化合物火焰的结果与氢火焰的结果进行比较，并从定性和定量方面解释了差异。在观察到的单个碳氢化合物火焰与双碳氢化合物火焰的相互作用数量之间进行了另一个比较。发现在域中有两个火焰不会显着改变每个火焰的相互作用数，因此表明观察到的相互作用主要是单个火焰内的自相互作用。