Spherical gas-fueled cool diffusion flames
Spherical gas-fueled cool diffusion flames
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DOI：
10.1016/j.proci.2022.07.015
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发表时间：
2023-06-07
影响因子：
3.4
通讯作者：
Axelbaum，Richard L.
中科院分区：
文献类型：
--
作者：
Kim，Minhyeng;Waddell，Kendyl A.;Axelbaum，Richard L.
对冷扩散火焰的更好理解可能会导致发动机的改进。这些火焰是在国际空间站的微重力环境中使用球形多孔燃烧器和气体燃料进行研究的。在不同的燃料和氧气浓度、压力和流量下，研究了乙烷、丙烷和正丁烷的正火和逆火燃烧。诊断包括增强型摄像机、辐射计和热电偶。首次观察到球形冷扩散火焰燃烧气体。然而，这些冷火焰并不容易产生，只有在环境氧摩尔分数为0.39的2巴正丁烷火焰中才能获得。产生冷焰的热焰的大小是它的2.6倍。结合前人的稳态液滴燃烧模型和冷扩散火焰的部分燃烧模型，提出了一个分析模型。结果表明，燃烧器温度对这些冷火焰的行为有重要影响。它们还表明，观测到的冷火焰位于混合率为0.53附近的富集区。
An improved understanding of cool diffusion flames could lead to improved engines. These flames are investigated here using a spherical porous burner with gaseous fuels in the microgravity environment of the International Space Station. Normal and inverse flames burning ethane, propane, andn-butane were explored with various fuel and oxygen concentrations, pressures, and flow rates. The diagnostics included an intensified video camera, radiometers, and thermocouples. Spherical cool diffusion flames burning gases were observed for the first time. However, these cool flames were not readily produced and were only obtained for normaln-butane flames at 2 bar with an ambient oxygen mole fraction of 0.39. The hot flames that spawned the cool flames were 2.6 times as large. An analytical model is presented that combines previous models for steady droplet burning and the partial-burning regime for cool diffusion flames. The results identify the importance of burner temperature on the behavior of these cool flames. They also indicate that the observed cool flames reside in rich regions near a mixture fraction of 0.53.