Acoustic instability of a premixed flame propagating in a tube
Acoustic instability of a premixed flame propagating in a tube
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DOI：
10.1016/s0010-2180(96)00069-7
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发表时间：
1996-11-01
影响因子：
4.4
通讯作者：
Gonzalez, M
中科院分区：
文献类型：
--
作者：
Gonzalez, M
通过数值模拟，研究了预混火焰在封闭管内传播的最后阶段。结果表明，火焰锋呈现出与声波密切相关的细胞结构。推导出以下场景：首先，当火焰到达侧壁并突然减速时，触发压力振荡。然后，出现一个细长的尖端，进一步塌陷；在此阶段，声波仅叠加到火焰前锋上，相互作用很弱。主尖点塌陷后，周期性加速度驱动火焰显示出细胞模式，其振荡时间周期是声学周期的两倍。这个过程逐渐导致总热量释放与压力同相振荡，从而产生剧烈的不稳定性。版权所有 (C) 1996 燃烧研究所
By means of numerical simulation, the last stage of the propagation of a premixed flame in a closed tube is investigated. It is shown that the flame front displays a cellular structure that has a close connection with the acoustic waves. The following scenario is derived: first, pressure oscillations are triggered as the flame reaches the lateral walls and suddenly decelerates. Then, a slender cusp appears that further collapses; during this stage, acoustic waves are only superimposed to the flame front and the interaction is weak. After the collapse of the primary cusp, the periodic acceleration drives the flame to display a cellular pattern oscillating with a time period that is twice the acoustic one. This process progressively leads the total heat release to oscillate in phase with pressure to produce a violent instability. Copyright (C) 1996 by The Combustion Institute