Comparative experiments were conducted under different water level heights and methane concentration conditions using a self-designed explosion experiment pipeline. The results showed that, in comparison with the scenario without water storage, when the water level was 2 cm and methane concentration was 6.5–12.5%, there was a dual effect including a pressure decrease caused by the endothermic cooling of liquid water and a pressure increase caused by the expansion of water vapour. These effects caused the pressure time history curve to exhibit a double-peak or multi-peak structure, and the average decrease in the peak deflagration pressure was 23.76%. The heat of vaporisation absorbed by the stored water and barrier effect of water vapour on the transfer of the heat slowed down the increase in the deflagration temperature. The average decrease in the peak deflagration temperature of methane was 13.82%, and the time to reach the peak deflagration temperature was extended as a whole, with an average delay of 0.22 s. Water storage also changed the shape of the deflagration flame front, which exhibited ‘knife’, ‘V’, and ‘crescent’ structures. Moreover, the flame propagation speed was significantly reduced, with the peak and average flame propagation speeds decreased by 83.3% and 83.6%, respectively. The research results can provide a certain reference for preventing gas explosions in typical confined spaces, and also help to explore new anti-explosion methods, which can be applied to marine equipment such as ships.

采用自行设计的爆炸实验管道在不同水位高度和甲烷浓度条件下进行对比实验。结果表明，与无蓄水情景相比，当水位为 2 cm，甲烷浓度为 6.5%~12.5% 时，存在液态水吸热冷却引起的压力下降和压力下降的双重效应。水蒸气膨胀引起的增加。这些影响导致压力时程曲线呈现双峰或多峰结构，峰值爆燃压力平均下降23.76%。储存的水吸收的汽化热和水蒸气对热量传递的阻隔作用减缓了爆燃温度的升高。甲烷峰值爆燃温度平均下降13.82%，达到峰值爆燃温度的时间整体延长，平均延迟0.22 s。蓄水也改变了爆燃火焰锋的形状，呈现出“刀”、“V”和“新月”结构。此外，火焰传播速度显着降低，峰值和平均火焰传播速度分别下降了 83.3% 和 83.6%。研究结果可为典型密闭空间气体爆炸的预防提供一定的参考，也有助于探索新的防爆方法，可应用于船舶等船舶设备。平均延迟为 0.22 秒。蓄水也改变了爆燃火焰锋的形状，呈现出“刀”、“V”和“新月”结构。此外，火焰传播速度显着降低，峰值和平均火焰传播速度分别下降了 83.3% 和 83.6%。研究结果可为典型密闭空间气体爆炸的预防提供一定的参考，也有助于探索新的防爆方法，可应用于船舶等船舶设备。平均延迟为 0.22 秒。蓄水还改变了爆燃火焰锋的形状，呈现出“刀”、“V”和“新月”结构。此外，火焰传播速度显着降低，峰值和平均火焰传播速度分别下降了 83.3% 和 83.6%。研究结果可为典型密闭空间气体爆炸的预防提供一定的参考，也有助于探索新的防爆方法，可应用于船舶等船舶设备。