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| 隔离墙作用下欠膨胀射流氢气点火爆炸的实验研究 |
| Experimental study on the effect of barrier wall on underexpanded hydrogen jet ignition and explosion |
| 投稿时间：2023-05-15 修订日期：2023-07-04 |
| DOI： |
| 中文关键词: 隔离墙 氢气爆炸 火焰前锋 超压 |
| 英文关键词:barrier wall hydrogen explosion flame front overpressure |
| 基金项目:国家重点研发计划项目(项目号：2021YFB4001001) |
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| 中文摘要: |
| 本文通过改变隔离墙与喷嘴间距离以及隔离墙长度研究了隔离墙作用下欠膨胀射流氢气点火爆炸时火焰行为和超压变化规律。实验中氢气供给压力恒定为0.5MPa,喷嘴直径为4mm,点火距离为20cm。结果表明,在点火爆炸初期,火焰前锋在点火位置以扇形向外扩散。随后受射流影响,逐渐演变成三角形。火焰前锋到达墙面后逐渐熄灭,最后射流火焰逐渐形成并在墙体上开始蔓延。射流火焰沿墙体向上、下两个方向蔓延且速度基本一致。墙体长度为70cm时即可有效防止火焰向墙后蔓延。爆炸受隔离墙和地面影响,超压出现了三个峰值。随着隔离墙与喷嘴间距离的增加,第一超压峰值在一定范围内波动,第二超压峰值逐渐减小。随着墙体长度的增加,最大超压呈现先增加后减小的趋势。 |
| 英文摘要: |
| In this paper, the flame behavior and overpressure evolutions during underexpanded hydrogen jet ignition and explosion were investigated by changing the distance between barrier wall and nozzle, as well as the length of barrier wall. In experiment, the hydrogen supply pressure was set to a constant 0.5MPa, the nozzle diameter was 4mm and the ignition distance was 20cm. The results show that at the initial stage of ignition and explosion, the flame front spreads outwards in a flabelliform shape at the ignition position. Affected by the jet, a triangular flame front is gradually evolved. The flame front is quenched when it reaches the wall. Finally, the jet flame gradually forms and spreads over the wall. The jet flame spreads upward and downward along the wall and those speeds are almost same. When the length of wall is 70cm, the flame can be effectively prevented from spreading behind the wall. The explosion is affected by the wall and the ground, resulting in three peaks of overpressure. As the distance between the wall and the nozzle increases, the first overpressure peak fluctuates within a certain range, while the second overpressure peak gradually decreases. As the length of wall increases, the maximum overpressure shows a tendency of first increasing and then decreasing. |
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