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Effects of ignition position on explosion of premixed propane-air in a T-type pipe

机译：点火位置对T型管中预混丙烷空气爆炸的影响

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摘要

Ignition position has an important influence on gas explosion, but few researches have been done on the ignition position in T-type pipe. In this paper, an experimental and numerical study of horizontal and vertical ignition positions in a T-type pipe has been presented. Results show that the ignition position has a great influence on the flame propagation velocity, flame structure and explosion pressure. In the case of vertical ignition, the maximum pressure appears near the T-type bifurcation, and there is an obvious stress concentration on the upper side wall of the bifurcation. In the case of horizontal ignition, the maximum pressure appears at the right end of the pipe, and a weak stress concentration occurring at the splitting point. When flame passing through the bifurcation, it takes 12 ms longer than ignition on horizontal, but the time for flame propagates from ignition to the end is less. The "tulip flame" forms three times after flame propagates the bifurcation when ignition on horizontal, but there is no "tulip flame" while ignition on vertical. In the case of vertical ignition, the scale of the vortex at the bifurcation is larger than that in the horizontal. The turbulent kinetic energy is mainly in the horizontal section when ignition on vertical, while it is mainly in the vertical pipe if ignition on horizontal.
机译：点火位置对气体爆炸有重要影响，但在T型管道的点火位置已经完成了很少的研究。本文介绍了T型管中水平和垂直点火位置的实验性和数值研究。结果表明，点火位置对火焰传播速度，火焰结构和爆炸压力具有很大影响。在垂直点火的情况下，在T型分叉附近出现最大压力，并且在分叉的上侧壁上存在明显的应力浓度。在水平点火的情况下，最大压力出现在管道的右端，并且在分裂点处发生弱应力浓度。当火焰通过分叉时，它比水平点火需要12毫秒，但火焰从点火到末端传播的时间较少。在火焰在水平点火时，火焰在火焰传播分叉后的“郁金香火焰”形成三次，但在垂直点火时没有“郁金香火焰”。在垂直点火的情况下，分叉处的涡流的比例大于水平的涡流。湍流动能主要在垂直点火时的水平部分，而在水平点火时主要在垂直管道中。

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