带电细水雾的灭火实验研究

摘要

This paper presents a design of an induction charging device by the principle of electrostatic induction to make water mist be forced charged. By using this device, the extinguishment of fire by charged water mist was experimentally investigated. As for the fire extinguishing efficiency, we conducted the small-scale experiments in a limited space, by changing the voltage polarity and magnitude, radius of needle-ring electrode and the distance from the needle-ring electrode to umbrella cover elec trode, whereby the fire extinguishing time and thermocouple temperature under different conditions were examined. The results show that compared to ordinary water mist, the charged water mist can reduce the flame temperature and extinguish the flame more quickly. The negatively charged water mist has a better inhibitory effect than the positively charged water mist. The fire extinguishing effectiveness could be improved and the extinguishment time could be reduced by increasing the voltage or decrea- sing of the radius of the needle-ring electrode and the distance between the two electrodes.%利用静电感应原理,设计了使细水雾强制带电的感应荷电装置,进行了带电细水雾的灭火实验研究。为研究带电细水雾的灭火效率,在受限空间内,采用小尺度实验方法,通过改变电压的极性和大小、针-环状电极的半径及其距伞罩电极之间的距离,分析对灭火时间和热电偶温度变化的影响。结果表明：带电细水雾比普通细水雾能更迅速地降低火焰温度、熄灭火焰,荷负电的细水雾比荷正电的细水雾具有更好的抑制效果,随着电压的增大、针-环状电极半径及两电极间距的减小,灭火效能提高,熄灭时间减少。