Triple flames in swirling flows

Triple flames in swirling flows
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旋转流中的三重火焰

DOI:
10.1016/j.combustflame.2022.112364
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发表时间:
2022
影响因子:
4.4
通讯作者:
Oran, Elaine S.
Oran, Elaine S.
中科院分区:
工程技术2区
文献类型:
--
作者:
Zhang, Xiao;Chung, Joseph D.;Oran, Elaine S.

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最近的工作表明,蓝色漩涡,一种无烟灰的碳氢化合物火焰,是由一个三重火焰在一个漩涡流经历旋涡破裂。本文介绍了三维,数值模拟的三重火焰在旋流与无涡破裂,并涉及到什么是已知的蓝色漩涡。三个旋流数的结果,所有这些发展三重火焰。然而,三重火焰的形状取决于是否有涡流破裂及其位置。在每种情况下,点火前后涡量的变化进行了检查。分析表明,对于最低的旋流数,体积膨胀的影响占主导地位,并减轻涡破裂。涡流的增加导致涡的拉伸和倾斜成为主导,并促进涡破裂。这些影响中的哪一个占主导地位决定了流动结构,然后流动结构决定了不同的火焰形状。从这项工作中获得的见解和他们的关系的蓝色漩涡进行了讨论。
Recent work has shown that the blue whirl, a soot-free hydrocarbon flame, is comprised of a triple flame in a swirling flow undergoing vortex breakdown. This paper describes three-dimensional, numerical simulations of triple flames in swirling flows with and without vortex breakdown and relates this to what is known about the blue whirl. The results for three swirl numbers are presented, all of which develop a triple flame. The shape of the triple flame, however, differs depending on whether there is vortex breakdown and its location. Changes in vorticity before and after ignition are examined for each case. The analysis shows that for the lowest swirl number, the effect of volume expansion dominates and mitigates vortex breakdown. Increasing swirl results in vortex stretching and tilting becoming dominant and promoting vortex breakdown. Which of these effects is dominant determines the flow structure and then the flow structure determines the different flame shapes. Insights gained from this work and their relation to the blue whirl are discussed.
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