摘要
基于木材是火灾中常见的可燃物之一,通过搭建超细水雾抑制受限空间木材燃烧的小尺寸实验平台,研究了超细水雾抑制受限空间木材燃烧的有效性及影响因素。施加超细水雾后,木材的热释放速率和O2的下降速率增大,CO2的生成量增大到固定值时逐渐趋于平稳,这表明超细水雾可以有效降低木材的热释放速率,抑制木材的燃烧。超细水雾抑制木材燃烧的效果依赖于雾通量、预燃时间、施加时间等因素。雾通量充足时预燃时间越长,火焰越容易熄灭;雾通量不足时,超细水雾无法抑制木材的燃烧;预燃时间一定时,雾通量越大,超细水雾抑制木材火焰的效果越好;雾通量和预燃时间一定时,施加超细水雾的时间越长,木材表面越不易有阴燃现象,抑制木材火焰的效果越好。
A small scale experimental compartment for ultra-fine water mist restraining confined space wood fire study was built, and the restraining efficiency and related factors were investigated. It was found that the heat release rate and the concentration of O2 descent quickly, the production of CO2 increased in a short time and ultimately tended to be stable after the imposition of ultra-fine water mist. It showed that the ultra-fine water mist can effectively reduce the heat release rate of wood and components generation rate. It was found that the restraining effect relies on preignition time, mist flux, discharging time and so on. With plenty mists and a short preignition time, the flame is easier to extinguish. The ultra-fine water mist can not restrain the combustion of wood while mist flux was not enough. For the fixed mist flux and preignition, the more the discharging time is, the more effective the suppression of the flame will be.
出处
《热科学与技术》
CAS
CSCD
2009年第2期156-163,共8页
Journal of Thermal Science and Technology
基金
教育部长江学者和创新团队发展计划资助项目(IRT0618)
河南省高校新世纪优秀人才支持计划资助项目(2005HANCET-05)
关键词
超细水雾
雾通量
预燃时间
施加时间
ultra-fine water mist
mist flux
preignition time
discharging time
