This paper presents the results of experimental studies of the spatial flow structure and coherent structures in the initial region of swirling jets at a Reynolds number of 5000 and different swirl rates. The contribution of these structures to the turbulent transport of momentum and mass was first quantitatively evaluated. In addition, for the case of high swirl with vortex core breakdown, the effect of coherent structures on the fluctuation in the local heat release rate due to the deformation of the flame front was investigated for combustion of a methane-air mixtures with an air excess ratio of 1.43.

中文翻译：

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旋流中射流和火焰初始区域的相干结构和湍流输运

本文介绍了在雷诺数为 5000 和不同旋流速率下旋流射流初始区域的空间流动结构和相干结构的实验研究结果。这些结构对动量和质量的湍流传输的贡献首先被定量评估。此外，对于涡核破裂的高涡流情况，研究了相干结构对由于火焰锋变形引起的局部放热率波动的影响，用于空气过量的甲烷-空气混合物的燃烧。比率为 1.43。