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.

中文翻译：

---

点火位置对T型管中预混合丙烷空气爆炸的影响

点火位置对气体爆炸具有重要影响，但对T型管点火位置的研究很少。本文介绍了在T型管中水平和垂直点火位置的实验和数值研究。结果表明，点火位置对火焰传播速度，火焰结构和爆炸压力有很大影响。在垂直点火的情况下，最大压力出现在T型分叉附近，并且在分叉的上侧壁上有明显的应力集中。在水平点火的情况下，最大压力出现在管道的右端，并且在分叉点处出现了较弱的应力集中。当火焰通过分叉时，比水平点火要长12毫秒，但是火焰从点火传播到燃烧结束的时间更少。在水平点火时，火焰传播了分叉之后，形成了三倍的“郁金香火焰”，但是在垂直点火时，没有“郁金香火焰”。在垂直点火的情况下，分叉处的涡旋尺度大于水平处的涡旋尺度。垂直点火时湍流动能主要在水平段，水平点火时湍流动能主要在垂直管中。