Influence of Water Mist and Sliding Device on Explosion Characteristics of Premixed Methane/Air
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摘要: 大量甲烷爆炸事故表明，甲烷/空气预混气体爆炸容易造成大量人员伤亡和巨大财产损失。利用10 cm × 10 cm × 100 cm透明实验管道，探究了细水雾协同滑动装置对甲烷爆炸特性的影响，并着重分析爆炸火焰和超压。结果表明：协同作用下，细水雾对燃烧区超压的影响较小，对未燃区超压峰值有明显衰减作用，甲烷体积分数为11.5%时衰减幅度最大，为44.71%。细水雾对指形火焰有冲毁作用，可加快火焰传播速度，甲烷体积分数为11.5%时，火焰传播速度的提升幅度最大，为62.50%。滑动装置反向压缩火焰至细水雾作用区，加速火焰焠熄。甲烷体积分数为9.5%和11.5%时，火焰焠熄时间明显下降，分别为20.76%和29.65%；甲烷体积分数为7.5%时，火焰焠熄时间下降3.5 ms。Abstract: A large number of methane explosion accidents show that premixed methane/air gas explosion is easy to cause huge casualties and property losses. The influence of the water mist cooperating with sliding device on the explosion characteristics of methane was explored by using the 10 cm × 10 cm × 100 cm transparent experimental pipe, and the explosion flame and overpressure was analyzed emphatically. The results show that the effect of water mist on the overpressure in the combustion zone is little under the synergistic effect. It has a significant attenuation effect on the peak overpressure in the unburned zone, and the maximum attenuation is 44.41% when the methane concentration is 11.5%. The water mist can destroy the finger flame and accelerate the flame propagation. When the methane concentration is 11.5%, the flame propagation speed increases by 62.50%. The sliding device reversely compresses the flame to the water mist action area to accelerate the flame extinction. When the methane concentration was 9.5% and 11.5%, the flame quenching time decreased significantly, which are 20.76% and 29.65%, respectively. When the methane concentration was 7.5%, the flame quenching time decreased by 3.5 ms.
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Key words:
- water mist /
- sliding device /
- cooperative /
- methane /
- explosion
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图 2 滑动装置作用下甲烷爆炸超压变化
Figure 2. Overpressure changes of methane explosion under the action of sliding device
图 3 细水雾协同滑动装置作用下甲烷爆炸超压变化
Figure 3. Overpressure changes of methane explosion under the action of water mist and sliding device
图 4 添加细水雾与无细水雾工况下压力对比
Figure 4. Pressure comparison chart between water mist added and no water mist
图 5 滑动装置存在下火焰前锋传播示意图
Figure 5. Schematic diagram of flame front propagation in the presence of a sliding device
图 6 添加细水雾工况下火焰前锋传播示意图
Figure 6. Schematic diagram of flame front propagation under the condition of adding water mist
图 8 火焰前锋传播速度和滑动装置滑移速度
Figure 8. Propagation velocity of flame front and sliding velocity of sliding device
表 1 压力传感器位置
Table 1. Distribution of pressure sensors along the pipeline
Location of sensor Voltage sensitivity/(mV·MPa−1) Range/MPa Installation position/cm P1 7 180 0–0.69 17.5 P2 7 608 0–0.69 100.0 
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表 2 实验工况
Table 2. Experimental conditions
Condition No. $\varphi$/% Water mist/MPa Condition No. $\varphi$/% Water mist/MPa 1 (C1) 7.5 4 (C4) 7.5 0.1 2 (C2) 9.5 5 (C5) 9.5 0.1 3 (C3) 11.5 6 (C6) 11.5 0.1
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表 3 细水雾作用下P1和 P2测量点处压力
Table 3. Pressure at P1 and P2 measuring points under the action of water mist
$\varphi $/% Overpressure/kPa Percentage drop/% P1 P2 7.5 15.0 9.2 38.67 9.5 19.0 14.0 26.32 11.5 15.0 9.4 37.33
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