火灾场景中细水雾幕对玻璃保护效果实验研究

Study on protection of window glass with water mist curtain under a fire scenario

在火灾环境中,玻璃极易受到过量热流的影响而发生破裂,从而增加火灾房间的通风,导致火势急剧增长,甚至跨区域蔓延。研究防止玻璃在火灾条件下破裂与脱落技术手段对火灾防控具有重要意义。基于此,提出了一种采用细水雾幕阻隔火焰热辐射保护玻璃的方法。实验通过改变细水雾幕工作压力及其在火灾不同阶段的启动,并与传统水膜法进行对比,研究各工况下的保护效果。结果发现火源与保护装置同时启动,细水雾幕与水膜都可以将玻璃首次破裂时间延长。流量为0.38 L/min时,在细水雾幕保护下玻璃首次破裂时间比水膜保护下延长361 s。细水雾幕工作压力越大,保护效果越好,但当压力超过1.0 MPa持续提高细水雾幕压力,保护效果变化不明显。当延迟到玻璃表面温度达到90℃时,启动这两种保护装置,细水雾幕对窗玻璃保护效果不受影响,但水膜法玻璃首次破裂时间会缩短。

Glass may break easily due to influence of heat flux during a fire,leading to increase of ventilation in fire room and significant acceleration even cross-regional spread of enclosure fire. It is significant for fire prevention and control through studying how to prevent break and falling off of window glass. Thus,we adopt a window glass pretection method to resist flame heat flux and decrease radiation received by glass in fire disaster by water mist curtain（ WMC）. The protective effect of WMC on window glass has been studied under different operating pressure and different time of opening WMC. In addition,the protective effect of WMC and water film on float glass has also been compared. The results illustrate that the time of window glass pane maintaining its integrated structure under the protection of WMC or water film extended. The initial breakage time of glass under pretection of WMC is 361 s longer than that with the protection of water film at flow of 0.38 L/min. The higher working pressure,the better protection efficiency of WMC. However,The protective effect of WMC is not obvious when work pressure is beyond 1 MPa. It is also found that the protection effect of WMC on window glass is not affected by delaying the activation of the WMC. However,when the maximum temperature of the glass reached 90℃ to open water film,initial breakage time of window glass decreased.