Dynamics of premixed confined swirling flames
Dynamics of premixed confined swirling flames
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DOI：
10.1016/j.crme.2009.06.001
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发表时间：
2009-06
影响因子：
0.8
通讯作者：
P. Palies;D. Durox;T. Schuller;P. Morenton;S. Candel
中科院分区：
文献类型：
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作者：
P. Palies;D. Durox;T. Schuller;P. Morenton;S. Candel
目前正在作出相当大的努力来研究燃烧不稳定性的基本机理，并开发出预测这些现象的方法。这个问题的一个中心方面是火焰对外来扰动的动态响应。这个问题是研究在本文章中，特别是考虑预混旋流火焰的扰动施加在上游侧的火焰在进料歧管的响应。火焰响应的特点是测量不稳定的热释放所施加的速度扰动。以相对放热速率波动与相对速度波动之比定义了火焰描述函数。这个量是针对一系列频率和不同水平的入射速度扰动确定的。还通过计算火焰光发射的条件相位平均值并对这些平均图像进行阿贝尔变换以获得振荡周期期间各个时刻的火焰几何形状来记录火焰动态。这些数据对确定可能的不稳定状态是有用的。引用这篇文章：P. Palies等人，C. R. Mecanique ···（···）.
Considerable effort is currently being extended to examine the fundamental mechanisms of combustion instabilities and develop methods allowing predictions of these phenomena. One central aspect of this problem is the dynamical response of the flame to incoming perturbations. This question is examined in the present article, which specifically considers the response of premixed swirling flames to perturbations imposed on the upstream side of the flame in the feeding manifold. The flame response is characterized by measuring the unsteady heat release induced by imposed velocity perturbations. A flame describing function is defined by taking the ratio of the relative heat release rate fluctuation to the relative velocity fluctuation. This quantity is determined for a range of frequencies and for different levels of incoming velocity perturbations. The flame dynamics is also documented by calculating conditional phase averages of the light emission from the flame and taking the Abel transform of these average images to obtain the flame geometry at various instants during the cycle of oscillation. These data can be useful to the determination of possible regimes of instability. To cite this article: P. Palies et al., C. R. Mecanique ••• (••••).