Thermal structure of the blue whirl
Thermal structure of the blue whirl
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DOI：
10.1016/j.proci.2018.05.115
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发表时间：
2019
影响因子：
3.4
通讯作者：
S. Hariharan;Evan Sluder;M. Gollner;E. Oran
中科院分区：
文献类型：
--
作者：
S. Hariharan;Evan Sluder;M. Gollner;E. Oran
蓝色漩涡是最近发现的一种火焰漩涡，即使直接燃烧液体燃料，也不会产生任何可见的烟灰。这种火焰是在固定框架的自卷吸火旋风实验装置中从传统的火旋风自然演化而来的。在这里，详细的热测量的火焰结构进行使用热电偶和细丝高温计。热电偶测量显示的峰值温度为2000 K，和2-D的温度分布从高温测量表明，大多数的燃烧发生在相对较小的，明显明亮的，蓝色的涡环。不同的液态烃燃料如庚烷、异辛烷和环己烷一致地形成了具有相似热结构的蓝色漩涡，这表明蓝色漩涡的形成与燃料类型无关，并且从火焰漩涡到蓝色漩涡的转变可能受到涡破裂的影响。
The blue whirl is a recently discovered regime of the fire whirl that burns without any visible soot, even while burning liquid fuels directly. This flame evolves naturally from a traditional fire whirl in a fixed-frame self-entraining fire whirl experimental setup. Here, detailed thermal measurements of the flame structure performed using thermocouples and thin-filament pyrometry are presented. Thermocouple measurements reveal a peak temperature of ∼2000 K, and 2-D temperature distributions from pyrometry measurements suggest that most of the combustion occurs in the relatively small, visibly bright, blue vortex ring. Different liquid hydrocarbon fuels such as heptane, iso-octane and cyclohexane consistently formed the blue whirl with similar thermal structures, indicating that blue whirl formation is independent of fuel type, and also that the transition from a fire whirl to a blue whirl may be influenced by vortex breakdown.