基于非连续介质着火机理的轰燃判据研究

Research on the flashover criterion based on ignition mechanism of discrete objects

基于非连续介质的着火机理将烟气层温度、可燃挥发分浓度、可燃挥发分着火高度量化,提出轰燃的判定方法。在SNHZ-01实验系统中进行小规模火灾模拟实验,验证判定方法的有效性。结果表明,室内烟气层温度达到非连续介质的自燃点且非连续介质热解挥发分的着火高度达到室内烟气层的稳定高度是轰燃发生的充分必要条件,可作为轰燃的判据,和实验结果具有较好的一致性。

Based on ignition mechanism of discrete objects,the conditions of flashover like temperature of smoke layer,concentration of combustible volatile and flame height of combustible volatile were quantified,the method which can represent flashover criterion were proposed.The experiments were carried out in SNHZ-01 system to certify the validity of this method.The results showed that in compartment the smoke layer temperature reaches to the au to-ignition point of the discrete objects and the ignition height of the pyrolytic volatiles of the discrete objects achieves the steady height of the smoke layer are sufficient and necessary conditions for flashover and can be used as flashover criterion which is agreeable with experimental results.