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fire extinguishment efficiency
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In this paper the interaction of cooking oil fires with water mist is studied by full scale experiments.The diameter and velocity of the droplet used in the experiments are measured by LDV/APV systems.Effect of the diameter,velocity and momentum of water mist on fire controlling and extinguishing efficiency are investigated.Fire extinguishment experiments with different nozzles,different pressures,different spray distances and different spray angles are performed.Results show that water mist system with suitable...

In this paper the interaction of cooking oil fires with water mist is studied by full scale experiments.The diameter and velocity of the droplet used in the experiments are measured by LDV/APV systems.Effect of the diameter,velocity and momentum of water mist on fire controlling and extinguishing efficiency are investigated.Fire extinguishment experiments with different nozzles,different pressures,different spray distances and different spray angles are performed.Results show that water mist system with suitable parameters can put out the cooking oil fires effectively without reigniting phenomena.Spray angle and spray distance also affect the fire extinguishment efficiency of water mist.Reasonable conditions and designing parameters for practical engineering application of water mist are suggested.

本文通过全尺寸模拟实验研究了细水雾与K类火的相互作用,利用LDV/APV激光多普勒分析仪对细水雾特性进行了测量,分析了细水雾的粒径、速度及雾动量对灭火有效性的影响规律。分别改变喷头类型、工作压力、喷头与火源的垂直距离及喷射角度进行多种工况的灭火实验,结果表明,细水雾的灭火有效性随着压力的增大得到明显提高,喷头的雾化性能直接影响着细水雾的灭火有效性,同时喷射角度及喷射距离也影响着细水雾的灭火有效性。本文为细水雾灭火技术用于厨房环境的火灾防护提供了科学的参考依据和必要的设计参数。

This paper introduces the concept of water mist technology,and discusses its extinguishment mechanism in comparison with other fire suppression systems briefly.Water mist has demonstrated some advantages in suppressing electrical and electronic fires(class C fires).The electric characteristic of water mist,the variation law of breakdown strength to electrical equipment with water mist applied,the suspending and the smoke scrubbing ability of water mist are expatiated with a viea to the experimental results carried...

This paper introduces the concept of water mist technology,and discusses its extinguishment mechanism in comparison with other fire suppression systems briefly.Water mist has demonstrated some advantages in suppressing electrical and electronic fires(class C fires).The electric characteristic of water mist,the variation law of breakdown strength to electrical equipment with water mist applied,the suspending and the smoke scrubbing ability of water mist are expatiated with a viea to the experimental results carried out by others.The investigation on efficiency and feasibility of water mist used in computer room and other electrical environment is thoroughly reviewed, and the working stability of electrical equipment with water mist applied is described.Effects of water mist diameter and velocity,water mist flux and barrier on water mist fire extinguishment efficiency are analyzed,and the application actuality of water mist in electrical environment is introduced.

介绍了细水雾的定义和主导灭火机理,对细水雾、水喷淋及气体灭火技术在电气环境的应用进行了比较,说明了细水雾用于电气环境火灾防治的优点及不足。结合前人实验结果系统地阐述了细水雾的导电性、细水雾作用下电气设备击穿强度变化规律、细水雾的滞空性及烟气冲刷能力。重点回顾了国际上细水雾用于计算机、程控交换机及发电机等电气设备火灾防护的可行性及有效性研究,描述了细水雾作用下带电工作的计算机、发电机、程控交换机等设备的稳定性和可靠性,讨论了雾滴粒径、雾滴速度、雾通量及障碍物遮挡程度等因素对扑灭电气火灾有效性的影响,介绍了国际上细水雾灭火技术在电气环境的应用现状。

Automatic Sprinkler System (ASS) is a regular automatic fire extinguishing system generally used. In this paper, the distribution of water and the fire extinguishment efficiency of ASS were studied experimentally, when the grid ceiling was installed below the sprinkler head. The experimental results indicated: grid ceiling affects the water distribution significantly, related with installation height of sprinkler head and water pressure. When the water pressure is increased, water density increased more...

Automatic Sprinkler System (ASS) is a regular automatic fire extinguishing system generally used. In this paper, the distribution of water and the fire extinguishment efficiency of ASS were studied experimentally, when the grid ceiling was installed below the sprinkler head. The experimental results indicated: grid ceiling affects the water distribution significantly, related with installation height of sprinkler head and water pressure. When the water pressure is increased, water density increased more quickly in the area without grid ceiling than where with grid ceiling. The effect of grid ceiling can be reduced and the fire extinguishment efficiency can be improved by increasing the water pressure. When the pressure is high enough, the fire extinguishment efficiency will approach the efficiency without grid ceiling. The results can be used in practical project to keep the fire extinguishment efficiency of sprinklers when installed above grid ceiling.

本文通过实验研究了自动喷水灭火系统在安装格栅类通透性吊顶后的水量分布特性。研究结果表明:格栅会严重改变自动洒水喷头的水量分布,其影响与喷头的安装高度和工作压力有关。当压力增加时,无格栅区域的水量增加明显大于有格栅的区域的水量增加。增大水压时,格栅对水量的分布的影响会减弱,当压力足够大时,能够接近无格栅时的灭火效率,可以保证自动喷水灭火系统在安装格栅吊顶后的灭火有效性。本文研究成果对实际工程应用具有指导意义。

 
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