Quantitative investigation of sooting dynamics in droplet combustion using an automated image analysis algorithm
Quantitative investigation of sooting dynamics in droplet combustion using an automated image analysis algorithm
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使用自动图像分析算法定量研究液滴燃烧中的烟灰动力学
DOI：
10.1016/j.fuel.2023.129313
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发表时间：
2023
期刊：
影响因子：
7.4
通讯作者：
Choi, Mun Y.
中科院分区：
文献类型：
--
作者：
Xu, Yuhao;Shen, Yiren;Avedisian, C. Thomas;Hicks, Michael C.;Choi, Mun Y.
本文报告了一种图像分析方法，使用新开发的开源程序从燃烧庚烷液滴的数字视频图像中提取烟灰体积分数（SVF）的定量测量值。这项工作中开发的自动化程序可以分析固定和不受束缚的液滴的图像，以量化烟灰动力学。该程序中分析的图像取自在国际空间站（ISS）上的多用户液滴燃烧装置（MDCA）中进行的实验。在这些实验中，燃烧液滴的视频成像是使用波长为 653 nm 的激光二极管的背光获得的。光线在穿过液滴和含有烟灰的区域之前被准直，然后光线被衰减并投射到相机的传感器上。该技术有利于基于全场消光法 (FFLEM) 原理的 SVF 测量。测量提供的定量数据揭示了液滴燃烧过程中液体燃料的烟灰动态。对燃烧过程中瞬间烟灰衰减图像（ISSn-庚烷，不受束缚的液滴）的分析表明，SVF 分布在烟灰壳位置有一个峰值。当位置远离燃烧液滴时，它会由于烟灰氧化而降低。关于对最大 SVF (SVFmax) 的时间影响，结果表明，燃烧开始后 SVFmax 首先增加，直到达到峰值，然后 SVFmax 减小。本研究中确定的正庚烷 SVFmax 值在数量上与先前报道的纤维支撑液滴的值一致，并且在燃烧历史中相对较早地达到。还分析了正庚烷图像，以显示初始液滴尺寸对最大烟灰体积分数的影响。结果表明，SVFmax 随着初始液滴尺寸的增大而减小，这与随着 Do 增大而形成的烟灰减少且火焰亮度变暗的目视观察结果一致。
This paper reports an image analysis approach using a newly-developed open-source program to extract quantitative measurements of soot volume fraction (SVF) from digital video images of burningn-heptane droplets. The automated program developed in this work can analyze images of fixed and untethered droplets to quantify sooting dynamics. The images analyzed in the program were taken from experiments carried out in the Multi-user Droplet Combustion Apparatus (MDCA) onboard the International Space Station (ISS). In these experiments, video imaging of burning droplets was obtained using backlighting by a laser diode with a wavelength of 653 nm. The light was collimated before it passed through the droplet and soot-containing region, after which the light was then attenuated and projected onto the camera’s sensors. This technique facilitates the measurements of SVF based on the principles of the full field light extinction method (FFLEM). The measurements provide quantitative data that reveal the sooting dynamics of liquid fuels during droplet combustion processes.The analyses of a soot-attenuating image (ISSn-heptane, untethered droplet) at an instant during the burning show that the SVF distribution has a peak at the soot shell location. It then decreases due to soot oxidation when the location is further away from the burning droplet. Regarding temporal effects on the maximum SVF (SVFmax), results show that SVFmaxfirst increases after the burning is initiated until a peak value is reached, after which SVFmaxdecreases. The SVFmaxvalues identified in this study forn-heptane are quantitatively consistent with previously reported values for fiber-supported droplets and are reached relatively early in the burning history.n-Heptane images are also analyzed to show the effects of initial droplet sizes on the maximum soot volume fraction. Results show that SVFmaxdecreases with increasing initial droplet size, which is consistent with visual observations of less soot formed and dimmer flame brightness asDoincreases.
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DOI：
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发表时间：
2004
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DOI：
--
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1990
期刊：
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