起爆
爆燃转爆轰
机械
冲击波
氢
爆燃
物理
障碍物
加速度
材料科学
热力学
经典力学
爆炸物
化学
有机化学
量子力学
政治学
法学
作者
Xinyu Zhao,Jiabao Wang,Longkun Gao,Jianfeng Pan,Yuejin Zhu
出处
期刊:Physics of Fluids
[American Institute of Physics]
日期:2023-01-01
卷期号:35 (1)
被引量:16
摘要
A staggered arrangement of solid obstacles promotes flame acceleration (FA) and the deflagration-to-detonation transition (DDT) in a homogeneous concentration field. Many combustible premixed gases, however, are inhomogeneous. The present numerical study explores the effects of different hydrogen–air distributions on the FA and DDT processes in a staggered obstacle-laden channel. The results show that, in the early stage of flame evolution, the flame accelerates faster when there are no obstructions on the side of the channel with the high hydrogen concentration. Under the suction effect of the aperture formed between an obstacle and the wall, the flame experiences multiple periods of velocity augmentation during its evolution. In terms of detonation initiation, the process can be classified as either detonation induced by the interaction between the flame surface and the reflected shock wave from the wall/obstacle, or detonation induced by the collision between the leading shock wave and the reflected shock wave from the obstacle. As the detonation wave propagates, regions with a hydrogen content of less than 12.7 vol. % cause a decoupling of the detonation wave. The morphology of the detonation wave (length, angle, and height) is related to the specific distribution of the hydrogen concentration. From the overall FA and DDT processes, a more homogeneous hydrogen concentration distribution leads to faster flame state variations and a faster triggering of the detonation.
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