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首页> 外文会议>IUTAM Symposium on Turbulent Mixing and Combustion >VISUALIZATION OF THE FUEL STRIPPING MECHANISM FOR WAKE-STABILIZED DIFFUSION FLAMES IN A CROSSFLOW
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VISUALIZATION OF THE FUEL STRIPPING MECHANISM FOR WAKE-STABILIZED DIFFUSION FLAMES IN A CROSSFLOW

机译：在十字流中唤醒扩散火焰的燃料汽提机构的可视化

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摘要

Recent publications have shown that diffusion flames stabilized in the wake of a burner tube exhibit combustion inefficiencies (i.e. incomplete combustion) that are sensitive to the crosswind velocity. Although data have shown that the inefficiencies appear to be a result of stripping of unburned fuel from the flame in coherent bursts, a clear picture of this mechanism is lacking. The goal of this paper is to help elucidate the mechanism by which these inefficiencies occur through flow visualization. Jet diffusion flames of natural gas were burned in a low turbulence wind tunnel. The gaseous fuel stream flowed from a 24.7mm diameter open tube that protruded vertically into the 1.2m high and 2.4m wide test section of a wind tunnel. The fuel jet was seeded with fine sili-cone oil droplets that evaporated as they reached the flame and acted as a conditional marker for unburned fuel. Using pulsed laser sheet illumination, Mie scattering from the silicon droplets showed that the unburned fuel was contained in coherent structures related to primary vortex structures in the jet and are acted upon by the mean flow field surrounding the flame and burner tube.
机译：最近的出版物表明，在燃烧器管之后稳定的扩散火焰表现出对对交叉风速敏感的燃烧低效率（即不完全燃烧）。虽然数据表明，效率低下似乎是从相干突发中从火焰中剥离未燃烧的燃料的结果，但缺乏这种机制的清晰图像。本文的目标是帮助阐明这些效率通过流动可视化发生的机制。喷射扩散火焰在低湍流风隧道中燃烧。气流流出的气态燃料流从24.7mm直径的开口管流入风隧道的1.2m高和2.4m宽的测试部分。燃料射流用细小的硅锥油滴播种，当它们到达火焰时蒸发并用作未燃烧燃料的条件标记。利用脉冲激光片照明，来自硅液滴的MIE散射表明，未燃烧的燃料包含在射流中的初级涡流结构相关的相干结构中，并且由围绕火焰和燃烧器管的平均流场作用。

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