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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含碱金属化合物细水雾对天然气爆炸的抑制特性


半受限空间内的天然气爆炸严重危害公共安全。添加添加剂的细水雾是减轻灾害强度的重要方法。但在实际场景中，爆炸通常会传播一定距离后才进入雾区，抑制爆炸较为困难。因此，利用自行设计的实验系统，在模拟场景下验证了含碱金属化合物细水雾的抑制效果。结果表明，与细水雾工况相比，火焰传播距离显着缩短，最短过火距离减小了40.0%。峰值超压和压力上升率也呈现明显下降，最大压力下降率达到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与未燃烧区的混合，增加了消耗自由基的可能性。与KCl和NaCl相比，含有K2CO3和Na2CO3的雾具有更高的抑制能力。该研究为细水雾抑爆的实际应用提供科学指导。