Experimental study on spontaneous ignition and flame propagation of high-pressure hydrogen release via a tube into air
Experimental study on spontaneous ignition and flame propagation of high-pressure hydrogen release via a tube into air
复制标题
高压氢气经管释放到空气中自燃及火焰传播的实验研究
DOI：
10.1016/j.fuel.2016.05.066
复制
发表时间：
2016-10
期刊：
影响因子：
7.4
通讯作者：
Sun Jinhua
中科院分区：
文献类型：
--
作者：
Duan Qiangling;Xiao Huahua;Gao Wei;Wang Qingsong;Sun Jinhua
利用压力记录、火焰探测和直接高速摄影等方法，对高压放氢过程中的自燃和火焰传播进行了实验研究。研究表明，爆压越大，发生自燃的可能性越大，初始发火越接近爆破盘。随着管子长度的增加，发生自燃的可能性增大，而自燃的临界释放压力减小。研究还发现，触发点火产生的强烈冲击波和促进火焰生长的长管是管内自燃向空气中喷流火焰转变的两个关键因素。火焰从管内喷出后，在氢气射流的前端形成火焰包络，逐渐分裂为上游和下游燃烧区域。上游火焰区向前传播。然而，下游火焰区域向管子出口移动。然后，火焰在管子出口处稳定下来，并逐渐增长。观察到在半封闭空间内连续发生了明显的爆燃事件。爆燃导致燃烧室内的压力显著增加。爆燃超压高于前导冲击波超压。前导冲击波超压和爆燃超压均随释放压力的增大而增大。爆燃后，在管子外部形成稳定的喷流火焰。在不同的流动控制机制下，可以观察到不同的射流火焰形态。
Spontaneous ignition and subsequent flame propagation of high-pressure hydrogen release via a tube into air are experimentally investigated using pressure records, flame detection and direct high-speed photographs. The study shows that as the burst pressure increases the likelihood of spontaneous ignition increases and the initial ignition is closer to the burst disk. With the increase of tube length, the possibility of spontaneous ignition increases, while the critical release pressure for spontaneous ignition decreases. It is also found that a strong shock wave generated to trigger the ignition and a long tube to promote the growth of the flame are two key factors for the transition from spontaneous ignition inside the tube to jet flame in the air. After the flame exits from the tube, a flame envelope is formed in the front of the hydrogen jet, which gradually splits into upstream and downstream combustion regions. The upstream flame region propagates forward. However, the downstream flame region moves back toward the tube exit. The flame is then stabilized at the tube exit and gradually grows. Noticeable deflagration events were observed to occur successively in the semi-enclosed space. The deflagration leads to a significant increase of pressure in the chamber. And the overpressure of the deflagration is higher than that of the leading shock wave. Both the overpressures of the leading shock wave and the deflagration increase with the release pressure. A stable jet flame is formed outside the tube subsequent to the deflagration. And different jet flame configurations are observed at different controlling mechanisms of flow.
登录
查看更多内容
影响因子：
7.2
作者：
Xu, B. P.;Hima, L. El;Tam, V. H. Y.
通讯作者：
Tam, V. H. Y.
影响因子：
7.2
作者：
Astbury, G. R.;Hawksworth, S. J.
通讯作者：
Hawksworth, S. J.
影响因子：
3.7
作者：
M. Radulescu;C. Law
通讯作者：
M. Radulescu;C. Law
影响因子：
7.2
作者：
R. Schefer;W. Houf;B. Bourne;J. Colton
通讯作者：
R. Schefer;W. Houf;B. Bourne;J. Colton
影响因子：
7.2
作者：
Grune, J.;Sempert, K.;Jordan, T.
通讯作者：
Jordan, T.