Intrinsic cellular instabilities of hydrogen laminar outwardly propagating spherical flames
Intrinsic cellular instabilities of hydrogen laminar outwardly propagating spherical flames
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DOI：
10.1016/j.fuel.2022.125149
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发表时间：
2022
期刊：
影响因子：
7.4
通讯作者：
Yuan-yi Xie;Mohamed Elsayed Morsy;Jinzhou Li;Junfeng Yang
中科院分区：
文献类型：
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作者：
Yuan-yi Xie;Mohamed Elsayed Morsy;Jinzhou Li;Junfeng Yang
在本研究中，压力，温度和当量比的影响，在预混氢/空气层流火焰的细胞不稳定性的开始使用定容风扇搅拌燃烧容器进行了研究。不稳定性的开始是由临界拉伸率，在该火焰速度迅速偏离其先前的响应拉伸标记。值得注意的是，临界Peclet数Pecl随着当量比和温度的增加而增加，表明火焰更稳定。而Pecl随着初始压力的增加而减小，这是由于火焰速度Markstein数随着压力的增加而减小，Mab随着压力的增加而减小。PeclandKcl的经验关联式，作为MAB的函数，压力，温度，和当量比的开发和提出。这种关联可以用来估计大规模大气氢火焰的严重程度。
In this study, the influences of pressure, temperature and equivalence ratio on the onset of cellular instabilities in premixed hydrogen/air laminar flames were studied using a constant volume fan-stirred combustion vessel. The onset of instability is marked by the critical stretch rate, at which the flame speed rapidly deviates from its prior response to stretch. It is noted that the critical Peclet number,Pecl, increases with increasing both equivalence ratio and temperature, indicating a more stable flame. Whilst,Pecldecreases with increasing the initial pressure due to the associated decrease in the flame speed Markstein number,Mabwith increasing pressure. Empirical correlations ofPeclandKcl, as a function ofMab, pressure, temperature, and equivalence ratio are developed and presented. Such correlations can be employed to estimate the severity of large-scale atmospheric hydrogen flames.