Experimental observation of diffusive-thermal oscillations of burner stabilized methane-air flames
Experimental observation of diffusive-thermal oscillations of burner stabilized methane-air flames
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DOI：
10.1016/j.combustflame.2019.12.016
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发表时间：
2020-03
影响因子：
4.4
通讯作者：
S. Nechipurenko;T. Miroshnichenko;N. V. Pestovskii;S. Tskhai;B. Kichatov;V. Gubernov;V. Bykov;U. Maas
中科院分区：
文献类型：
--
作者：
S. Nechipurenko;T. Miroshnichenko;N. V. Pestovskii;S. Tskhai;B. Kichatov;V. Gubernov;V. Bykov;U. Maas
在这项工作中，我们通过实验研究了常压下平燃烧器稳定的甲烷-空气火焰的扩散热不稳定性的发生。通过使用视觉成像（包括高速视频记录、光谱和声学测量）来研究燃烧前沿的结构和动力学。还使用一维模型对具有详细反应机制的燃烧器稳定火焰进行了数值模拟。确定了火焰振荡出现的临界条件和脉动周期。发现用不同技术获得的实验数据非常一致，并且与数值结果相关。数值计算的数据显示对反应机理的选择敏感。因此，对临界条件和火焰振荡特性的直接测量和计算为详细反应机理的验证和确认开辟了新的视角。
In this work we experimentally investigate the onset of the diffusive-thermal instabilities for flat burner stabilized methane-air flames at normal pressure. The structure and dynamics of combustion fronts are studied by using visual imaging, including high-speed video recording, spectroscopic and acoustic measurements. Numerical simulations with a one-dimensional model for a burner stabilized flame with detailed reaction mechanisms are also conducted. The critical conditions for the emergence of flame oscillations and the period of pulsations are determined. The experimental data obtained with different techniques are found to be in good agreement and also correlate with the numerical results. The numerically calculated data are shown to be sensitive to the choice of the reaction mechanism. Thus a direct measurement and calculation of the critical conditions and the characteristics of flame oscillations open a new perspective for the verification and validation of detailed reaction mechanisms.