The instability of laminar methane/hydrogen/air flames: Correlation between small and large-scale explosions
The instability of laminar methane/hydrogen/air flames: Correlation between small and large-scale explosions
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DOI：
10.1016/j.ijhydene.2022.06.289
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发表时间：
2022-08-29
影响因子：
7.2
通讯作者：
Yang, Junfeng
中科院分区：
文献类型：
--
作者：
Morsy, Mohamed E.;Yang, Junfeng
达里厄斯-朗道(D-L)不稳定性会在自由膨胀的球形火焰中引起显著的加速，从而可能导致意外的大规模气体爆炸。为了评估利用高压实验室实验预测大规模大气爆炸中细胞不稳定性的可能性，在实验室高压球形爆炸中对氢气和甲烷混合物的细胞不稳定性进行了实验测量。这些测量结果与几个大型大气实验的结果进行了比较。对于氢/空气混合物，建立了压力对临界Karlovitz数K-CL和应变速率Markstein数Ma(Sr)的影响的综合关联式。当MASR变为负值时，所有混合物的稳定性都会降低。从大规模实验得出的值与KCL与MSR值具有相同的相关性。因此，层流爆炸火焰变得不稳定的区域范围可以预测为MASR和压力的函数。(C)2022年提交人(S)。爱思唯尔有限公司代表氢能出版有限责任公司出版。
Darrieus-Landau (D-L) instability can cause significant acceleration in freely expanding spherical flames, which can lead to accidental large-scale gas explosions. To evaluate the potential of using high-pressure lab-scale experiments to predict the onset of cellular in-stabilities in large-scale atmospheric explosions, experimental measurements of the cellular instabilities for hydrogen and methane mixtures are conducted, in laboratory spherical explosions at elevated pressures. These measurements are compared with those from several large-scale atmospheric experiments. Comprehensive correlations of the pressure effect on a critical Karlovitz number, K-cl, together with those of strain rate Markstein number, Ma(sr), are developed for hydrogen/air mixtures. The regime of stability reduces for all mixtures, as Masr becomes negative. Values derived from large-scale ex-periments closely follow the same correlation of Kcl with Masr. As a result, the extent of the regime where the laminar explosion flames become unstable can be predicted as a func-tion of Masr and pressure. (C) 2022 The Author(s). Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC.