两相流气体种类灭B类火效果的实验

Effect of gas species on fire extinguishment using two phase flow

两相流灭火系统中,气相采用不同的气体,其灭火效果不同.研究了采用空气、氮气、二氧化碳、氩气4种不同种类气体条件下,两相流细水雾灭火系统在3.6 m×4.6 m×3.9 m的空间内,灭0.1 MW及0.61 MW方油盘火的灭火特性及规律.实验过程中采用热电偶树和西门子气体分析仪对火焰温度及火场氧体积分数进行了测量,得到了不同气体种类条件下的细水雾灭火特性包括火焰最高温度、温度下降速率、氧体积分数下降速率、灭火时间等参数的变化规律和灭火过程中火场温度场和氧体积分数值的变化规律.

In the fire extinguishment system by using two phase flow,when the gas phase uses different gas species,the fire fighting effects are different.Four gases were used as the gas phases like air,nitrogen,carbon dioxide and argon.The experiments were conducted in a room measured by 3.6m×4.6m×3.9m and the fire sizes were 0.1 MW and 0.61 MW.The type K thermal-couple tree and Siemens oxygen analyzer Oxymat-61 were used to measure the fire temperature and oxygen concentration separately.The fire extinguishment characters using two phase flow water mist under different gas phase conditions were got.The mode of actions under different gas species on fire extinguishment was concluded and the reason that the difference takes place was analyzed.Compared with the single phase flow,it shows that the fire extinguishment efficiency by using two phase flow under low system pressure is equal to single phase flow under higher system pressure.