The natural gas explosion in semi-constrained spaces seriously jeopardize public safety. Water mist containing additive is an important method to reduce the disaster intensity. However, in actual scenarios, the explosion usually propagates for a certain distance before entering the mist area, which is more difficult to suppress the explosion. Therefore, the self-designed experimental system was used to recognize the suppression effect of water mist containing alkali metal compounds under the simulated scenario. The results show that the flame propagation distance was significantly reduced, the shortest overfire range was decreased by 40.0 % compared with the water mist condition. The peak overpressure and pressure rise rate also showed a significant decrease, the maximum pressure drop rate reached 72.3 %. When the explosion flame entered the atomized region, the turbulent disturbance generated by the atomization accelerated the mixture of combustion zone and the unburned area, which increases the possibility of consuming free radicals. Compared with the KCl and NaCl, the mist containing K2CO3 and Na2CO3 share higher suppression capacity. This study provides scientific guidance for the practical application of water mist explosion suppression.

中文翻译：

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天然气爆炸中含碱金属化合物细水雾的抑制特性


天然气爆炸在半受限空间内严重危害公共安全。含细水雾的添加剂是降低灾害强度的重要方法。但在实际场景中，爆炸通常会在进入迷雾区域之前传播一定距离，这更难抑制爆炸。因此，采用自主设计的实验系统对模拟情景下含碱金属化合物的水雾的抑制效果进行识别。结果表明，与细水雾条件相比，火焰传播距离显著缩短，最短过火范围减小了 40.0 %。峰值超压和升压速率也表现出显著降低，最大压降率达到 72.3 %。当爆炸火焰进入雾化区时，雾化产生的湍流扰动加速了燃烧区和未燃烧区的混合，增加了消耗自由基的可能性。与 KCl 和 NaCl 相比，含有 K2CO3 和 Na2CO3 的油雾具有更高的抑制能力。本研究为细水雾灭爆抑制的实际应用提供了科学指导。