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首页> 外文期刊>Combustion Science and Technology >Fractal Analysis of Fluorescence Images to Assess Robustness of Reference-surface Positioning in Flame Fronts
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Fractal Analysis of Fluorescence Images to Assess Robustness of Reference-surface Positioning in Flame Fronts

机译:荧光图像的分形分析评估火焰前线参考表面定位的鲁棒性

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Images of laser-induced fluorescence (LIF) of hydroxyl radicals (OH) produced in premixed flames are here analyzed from the perspective of fractal theory applied to flame wrinkling. The results confirm that the signal isosurface showing the best correlation with the position of the maximum fluorescence gradient is in a strong correspondence with the inner layer within which the reference surface of maximum heat release can be found. Nonetheless, fluctuating maximum OH concentration or poor levels of signal-to-noise ratio could lead to a partial failure of either threshold or maximum gradient techniques of front extraction from LIF images. On the other hand, potential deviations from the reference surface can be tolerated provided that the chosen isosurface has a fractal dimension D-2 ranging between 1.10 and 1.26, well below the limit for passive scalars (D-2 = 1.37).
机译:从应用于火焰皱纹的分形理论的角度分析了在预混火焰中产生的激光诱导的荧光(LiF)的图像的图像。 结果证实,表示与最大荧光梯度的位置的最佳相关性的信号异构表面与最大热释放的参考表面的内层相对应。 尽管如此,波动最大OH浓度或信噪比的差可能导致前部提取的阈值或最大梯度技术的部分失败。 另一方面,可以耐受与参考表面的电位偏差,条件是所选择的肌肉表面的分形尺寸D-2之间的分形尺寸D-2之间的范围在1.10和1.26之间,远低于被动量子的极限(D-2 = 1.37)。

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