Identifying combustion regimes in terms of premixed and non-premixed characteristics is an important task for understanding combustion phenomena and the structure of flames. A quasi-DNS database of the compositionally inhomogeneous partially premixed Sydney/Sandia flame in configuration FJ-5GP-Lr75-57 is used to directly compare different types of flame regime markers from literature. In the simulation of the flame, detailed chemistry and diffusion models are utilized and no turbulence and combustion models are used as the flame front and flow are fully resolved near the nozzle. This allows evaluating the regime markers as a post-processing step without modeling assumptions and directly comparing regime markers based on gradient alignment, drift term analysis and gradient free regime identification. The goal is not to find the correct regime marker, which might be impossible due to the different set of assumptions of every marker and the generally vague definition of the partially premixed regime itself, but to compare their behavior when applied to a resolved turbulent flame with partially premixed characteristics.

中文翻译：

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从准 DNS 数据集识别部分预混燃烧中的火焰状态

根据预混和非预混特性识别燃烧状态是理解燃烧现象和火焰结构的重要任务。配置 FJ-5GP-Lr75-57 中成分不均匀的部分预混悉尼/桑迪亚火焰的准 DNS 数据库用于直接比较文献中不同类型的火焰状态标记。在火焰模拟中，使用了详细的化学和扩散模型，没有使用湍流和燃烧模型，因为在喷嘴附近完全解析了火焰前沿和流动。这允许将状态标记作为后处理步骤进行评估，而无需建模假设，并基于梯度对齐、漂移项分析和无梯度状态识别直接比较状态标记。