Edge Diffusion Flame Stabilization Behind a Step over a Liquid Reactant
Edge Diffusion Flame Stabilization Behind a Step over a Liquid Reactant
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液体反应物上一步后的边缘扩散火焰稳定
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
S. Candel
中科院分区：
文献类型：
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作者：
M. Juniper;S. Candel
本文讨论了在一个台阶后，一个原子在液体反应物上的稳定性。进行量纲分析以突出可能是必要的参数。本文首先研究了较为简单的锥流场，包括无台阶的液体燃料绕流场和边界层内的流场。通过系统的数值计算发现，对稳定性影响最大的参数是台阶高度与壁厚之比。如果这个名字是薄的，它会藏在台阶后面，对其他参数不敏感。如果波纹较厚，它就不能停留在台阶后面的慢速区，而暴露在自由气流中。它对达姆科勒数非常敏感，很容易被吹掉。数值模拟是在一个圆锥体上进行的，该圆锥体代表在高速流出的气态氢和低速液氧流之间的低温同轴喷射器。尽管如此，无量纲的结果应该是有效的范围广泛的规模和反应物的组合。
The stabilization of a e ame behind a step over a liquid reactant is discussed. Dimensional analysis is performed to highlight theparametersthat could be ine uential. Simplercone gurations are studied e rst, including a crosse ow e ame and the e ame in a boundary layer over a liquid fuel without a step. From systematic numerical calculations it is found that the most effective parameter regarding stabilization is the height of the step with respect to the e ame’ s thickness. If the e ame is thin, it tucks behind the step and is insensitive to the other parameters. If the e ame is thick, it cannot remain in the slow-moving zone behind the step and is exposed to the freestream. It is then very sensitive to the Damk¨ ohler number and is readily blown off. The numerical simulations are performed on a cone guration that represents a cryogenic coaxial injector between gaseous hydrogen e owing at high speed and a stream of low-speed liquid oxygen. Nevertheless, the non-dimensional results should be valid over a wide range of scales and reactant combinations.