The Effects of Non-Unity Lewis Numbers on Turbulent Premixed Flame Interactions in a Twin V-Flame Configuration

The Effects of Non-Unity Lewis Numbers on Turbulent Premixed Flame Interactions in a Twin V-Flame Configuration
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非统一路易斯数对双 V 型火焰结构中湍流预混火焰相互作用的影响

DOI:
10.1080/00102202.2013.763801
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发表时间:
2013
影响因子:
1.9
通讯作者:
Dunstan T
Dunstan T
中科院分区:
工程技术4区
文献类型:
--
作者:
Dunstan T

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利用高分辨率火焰模拟数据自动特征提取技术研究了刘易斯数对湍流预混火焰相互作用的影响。在相同的湍流条件下的预混合湍流双V火焰模拟在全球刘易斯数为0.4,0.8,1.0,和1.2。信息的位置,频率和相互作用的大小进行了比较,并讨论了采样间隔的结果的灵敏度。结果表明,随着刘易斯数的减小,正常型相互作用的频率和强度均增大。随着刘易斯数的增加,反常型相互作用变得更可能。的相互作用的频率和幅度的变化被发现是由火焰的热扩散稳定性的差异导致的火焰燃烧的大规模变化所造成的。在火焰相互作用过程中,由于时间尺度的分离,热扩散效应被发现是微不足道的。
The influence of Lewis number on turbulent premixed flame interactions is investigated using automatic feature extraction (AFE) applied to high-resolution flame simulation data. Premixed turbulent twin V-flames under identical turbulence conditions are simulated at global Lewis numbers of 0.4, 0.8, 1.0, and 1.2. Information on the position, frequency, and magnitude of the interactions is compared, and the sensitivity of the results to sample interval is discussed. It is found that both the frequency and magnitude of normal type interactions increases with decreasing Lewis number. Counternormal type interactions become more likely as the Lewis number increases. The variation in both the frequency and the magnitude of the interactions is found to be caused by large-scale changes in flame wrinkling resulting from differences in the thermo-diffusive stability of the flames. During flame interactions, thermo-diffusive effects are found to be insignificant due to the separation of time scales.
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