In this paper, blast mitigation using water mist was evaluated to assess the operational capability of the use of firefighting systems implemented in ships or infrastructures to reduce blast effects. In particular, we tried to determine the mitigation that could be obtained in specific situations. A tunnel equipped with a water mist system enabled us to assess the mitigation impact of water mist on a blast. Blast effects were evaluated using four pressure gauges on the tunnel walls and one pressure gauge at the end of the tunnel. As a first step, we evaluated the mitigation efficiency based on water mist characteristics (the droplet size and the water load) when the charge was detonated inside the mist, the tunnel being either open or closed. Then, we assessed the mitigation efficiency when the charge was detonated outside the mist with only the blast wave propagated in the mist. The reduction in the initial overpressure and the maximum impulse were higher when the charge exploded inside the water mist, and this is most likely due to the quenching of secondary reactions by the water mist. To obtain a better understanding of mitigation mechanisms, shock tube experiments were conducted. The break-up of water drops in the high-speed airstream behind the shock wave was observed, but the presence of mist had no significant effect on the shock wave profile. This is in line with the importance of fireball extinguishment in the mitigation process.

中文翻译：

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细水雾的爆炸缓解：引爆配置的影响

在本文中，对使用细水雾的爆炸缓解进行了评估，以评估使用在船舶或基础设施中实施的消防系统以减少爆炸影响的操作能力。特别是，我们试图确定在特定情况下可以获得的缓解措施。配备细水雾系统的隧道使我们能够评估细水雾对爆炸的缓解影响。使用隧道壁上的四个压力计和隧道末端的一个压力计评估爆破效果。作为第一步，我们根据细水雾特性（液滴大小和水负荷）评估了当电荷在雾中引爆时的缓解效率，隧道是打开的还是关闭的。然后，我们评估了当装药在雾外引爆而只有冲击波在雾中传播时的缓解效率。装药在细水雾内部爆炸时，初始超压的降低和最大冲量更大，这很可能是由于细水雾对二次反应的淬灭。为了更好地了解缓解机制，进行了激波管实验。观察到冲击波后面高速气流中的水滴破碎，但雾的存在对冲击波剖面没有显着影响。这符合火球灭火在缓解过程中的重要性。装药在细水雾内部爆炸时，初始超压的降低和最大冲量更大，这很可能是由于细水雾对二次反应的淬灭。为了更好地了解缓解机制，进行了激波管实验。观察到冲击波后面高速气流中的水滴破碎，但雾的存在对冲击波剖面没有显着影响。这符合火球灭火在缓解过程中的重要性。装药在细水雾内部爆炸时，初始超压的降低和最大冲量更大，这很可能是由于细水雾对二次反应的淬灭。为了更好地了解缓解机制，进行了激波管实验。观察到冲击波后面高速气流中的水滴破碎，但雾的存在对冲击波剖面没有显着影响。这符合火球灭火在缓解过程中的重要性。但雾的存在对激波剖面没有显着影响。这符合火球灭火在缓解过程中的重要性。但雾的存在对激波剖面没有显着影响。这符合火球灭火在缓解过程中的重要性。