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Time-Dependent Spatial Structures of Mezzo-Scale Mixing Processes with Turbulent Diffusion Flame

机译：湍流扩散火焰中尺度混合过程的时变空间结构

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摘要

Space- and time-resolved information, as well as macro- and microscopic visualizations, is essential for a full study of mixing, reaction and heat-transfer mechanisms in a turbulent diffusion flame. However, turbulent diffusion flame structures have been studied mostly by time-resolved single-point measurement, due to the limit of available diagnostics. The time-dependent spatial structures of turbulent diffusion flames have often been masked by the statistical analyses. In this study, we visualized time-dependent spatial mixing processes in a turbulent diffusion flame by instantaneous flame luminosity and planar Mie scattering images via a high-speed video system (HSVS). We employed a simultaneously combined measurement method in particular consisting of direct photography and a laser sheet method to determine the mezzo-scale structure of the turbulent mixing process, both spatially and temporally. This method can be used to clarify the time-dependent spatial structure of the combustion area and the surrounding atmospheric area while quantitatively evaluating their mixing process from a geometric viewpoint.
机译：空间和时间分辨信息以及宏观和微观可视化，对于全面研究湍流扩散火焰中的混合，反应和传热机理至关重要。然而，由于现有诊断方法的局限性，大多数通过时间分辨单点测量研究了湍流扩散火焰结构。湍流扩散火焰随时间变化的空间结构经常被统计分析所掩盖。在这项研究中，我们通过高速视频系统（HSVS）通过瞬时火焰光度和平面Mie散射图像可视化了湍流扩散火焰中随时间变化的空间混合过程。我们采用了一种同时组合的测量方法，特别是直接摄影和激光薄片方法，以确定空间和时间上湍流混合过程的中尺度结构。该方法可用于阐明燃烧区域和周围大气区域随时间变化的空间结构，同时从几何角度定量评估它们的混合过程。

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