Numerical study of spontaneous ignition of pressurized hydrogen release into air
Numerical study of spontaneous ignition of pressurized hydrogen release into air
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DOI：
10.1016/j.ijhydene.2009.01.045
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发表时间：
2009-07-01
影响因子：
7.2
通讯作者：
Tam, V. H. Y.
中科院分区：
文献类型：
--
作者：
Xu, B. P.;Hima, L. El;Tam, V. H. Y.
对高压氢气突然释放到空气中的自燃现象进行了数值模拟。采用混合平均多组分方法精确计算分子输运。自燃化学和燃烧化学采用21步动力学方案。为了减少数值扩散的错误，采用了极细网格和任意拉格朗日-欧拉（ALE）方法，其中对流项与其他项分开求解。以前在实验室试验中观察到加压氢释放的自燃现象，并怀疑这是一些事故的可能原因。目前的数值研究成功地捕获了这一现象，并证明了由于激波加热空气和膨胀的氢之间的分子扩散而导致自燃的可能机制。文中还讨论了湍流在扭曲氢-空气接触面混合中的作用，以及从初始层流火焰向湍流射流火焰发展的可能性。(C) 2009年国际氢能协会。Elsevier Ltd.出版。版权所有。
Numerical simulations have been carried out for spontaneous ignition in the sudden release of pressurized hydrogen into air. A mixture-averaged multi-component approach was used for accurate calculation of molecular transport. Spontaneous ignition and combustion chemistry were accounted for using a 21-step kinetic scheme. To reduce false numerical diffusion, extremely fine meshes were used along with the arbitrary Lagrangian-Eulerian (ALE) method in which convective terms are solved separately from the other terms.Spontaneous ignition of pressurized hydrogen release was previously observed in laboratory tests and suspected as a possible cause of some accidents. The present numerical study has successfully captured this phenomenon and demonstrated a possible mechanism for spontaneous ignition due to molecular diffusion between the shock-heated air and the expanding hydrogen. The role of turbulence in the mixing at the region of the distorted hydrogen-air contact surface and the potential development from the initial laminar flame to a turbulent jet flame has also been discussed. (C) 2009 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.