动态变压货舱火行为及烧穿防火内衬层能力研究

Study on fire behavior characteristics and it’s burn-through capability to cargo liner in dynamic pressure cargo compartment

为探究飞机货舱由降压抑灭火带来的动态变压环境对火行为的控制作用和火灾烧穿能力的影响机制,提升火灾防控能力,模拟近真实的货舱应急动态变压环境,开展一系列油池火灾和防火内衬层耐烧穿试验。研究结果表明:降压会增加油类火灾的火焰高度并抬升火焰高温区,导致火焰与货舱天花板直接接触。防火内衬层限制火焰高度、空气卷吸和热气流逸出,在内衬层下方形成射流燃烧,增大火焰与内衬层的接触面积,而且增强对火灾的热反馈作用。由降压引起质量燃烧速率的降低导致燃烧时间更长,火焰高温区与内衬层的接触时间增长,烧损膨胀区域和炭化区域均较大,火灾损伤更为严重。

In order to explore control effect of dynamic pressure caused by depressurization on fire behavior and mechanism on the burn-through ability and enhance fire prevention capability,nearly real emergency dynamic variable pressure environment was constructed,a series of fire resistance tests of oil pools and fire lining were carried out. The results show that depressurization could increase flame height and raise high temperature area,resulting direct contact between flames and cargo compartment ceiling.Cargo liner limited flame height,air entrainment and hot air escape. Raised flame forms jet fire below cargo liner,increased contact area between flame and cargo liners,and enhanced thermal feedback. The decreased mass burning rate led to longer burning time and contact time between flame high temperature area and cargo liner,burned expansion area and carbonized area of cargo liner are larger,and more serious burning damage.