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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Synchronization of dual diffusion flame in co-flow
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Synchronization of dual diffusion flame in co-flow

机译：双重扩散火焰在共流中的同步

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摘要

In this study, the interaction of two adjacent diffusion flames (dual flame) were experimentally investigated using the direct imaging method and particle image velocimetry (PIV) measurements for varied distances between the two flames under the influence of the co-flow. The direct imaging method indicates the presence of various synchronization modes, such as merging, in-phase synchronization, amplitude death, anti-phase synchronization, and desynchronization, as the distance between the flames was increased. The dual flame synchronization was characterized using an image analysis of the time-series variation of flame heights summarized by the mean flame height, root-mean-square of the flame height, Strouhal number, and the cross-correlation coefficient of flame heights against the burner distance. Furthermore, the unsteady velocity fields of the synchronized flames were measured using NV combined with the proper orthogonal decomposition (POD) analysis to extract the flow structure of the dual flame. The experimental results indicated that the in-phase mode is characterized by the formation of symmetrical vortices, whereas the anti-phase mode features the formation of asymmetrical vortices inside and outside of the flame. The POD analysis demonstrated higher fluctuating energy in the anti-phase mode than in the in-phase mode, which suggested the formation of a highly organized flame structure in the anti-phase mode.
机译：在该研究中，使用直接成像方法和颗粒图像速度（PIV）测量在经过直接成像方法和颗粒图像速度（PIV）测量在汇流的影响下进行两种火焰之间的不同距离进行实验研究。直接成像方法表示存在各种同步模式，例如合并，相位同步，幅度死亡，抗相同步和去同步，随着火焰之间的距离增加。使用由平均火焰高度，火焰高度，斯特鲁哈尔数的平均火焰高度，截然正方形和火焰高度的互相关系数汇总的火焰高度的时间序列分析的图像分析来表征双火焰同步。燃烧距离。此外，使用NV与适当的正交分解（POD）分析相结合测量同步火焰的不稳定速度场以提取双火焰的流动结构。实验结果表明，以相位模式的特征在于对称涡流的形成，而抗相位模式具有在火焰内外形成的不对称涡流。 POD分析在抗相位模式中表现出比同相模式更高的波动能量，这表明在抗相模式中形成高度有组织的火焰结构。

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