滑移装置协同气液两相流抑制受限空间甲烷爆炸试验研究

Experimental study on the synergistic effect of sliding devices on gas-liquid two-phase flow suppression of methane explosion in confined spaces

为探究不同气体驱动水雾喷洒对滑移装置下甲烷爆炸特性的影响规律,在方形管10 cm×10 cm×100 cm中开展爆炸试验,借助高速摄像技术和压力采集技术,通过改变滑移装置弹簧线径、水雾驱动气体类别,剖析不同工况对爆炸火焰结构演变行为和压力瞬态变化规律的影响。结果表明:N_(2)驱动细水雾与滑移装置对甲烷的协同抑爆灭火效果优于空气驱动水雾协同滑移装置作用,且预防细水雾抑爆失效情形下,N_(2)可起到冗余灭火作用和协同增效作用。对比空气驱动细水雾作用,N_(2)驱动细水雾可有效缩短火焰燃烧时间,延缓火焰锋面速度峰值出现,抑制火焰锋面形态演变,缩小压力振荡区间,衰减近一半超压峰值,将最大超压峰值有效控制在燃烧区内,减少未燃区二次爆炸的可能性。

To investigate the influence of different gas⁃driven wa⁃ter mist sprays on the methane explosion characteristics under slid⁃ing devices,10 cm×10 cm×100 cm explosion tests were con⁃ducted in a square tube,using high⁃speed camera technology and pressure acquisition technology.By changing the spring diameter of the sliding device and the type of water mist driving gas,the ef⁃fects of different working conditions on the evolution behavior of the explosion flame structure and the transient change law of pres⁃sure were analyzed.The results show that the synergistic suppres⁃sion and extinguishing effect of N_(2)driven water mist and sliding device on methane is better than that of air driven water mist syn⁃ergistic sliding device,and N_(2)can play a redundant extinguishing and synergistic effect in preventing the failure of water mist sup⁃pression.Compared to the effect of airdriven water mist,N_(2)-driven water mist can effectively shorten the flame combustion time,delay the peak velocity of the flame front,suppress the evo⁃lution of the flame front morphology,narrow the pressure oscilla⁃tion range,attenuate nearly half of the overpressure peak,effectively control the maximum overpressure peak within the combus⁃tion zone,and reduce the possibility of secondary explosion haz⁃ards in the unburned zone.