• CN:11-2187/TH
  • ISSN:0577-6686

›› 2002, Vol. 38 ›› Issue (9): 17-21.

• 论文 • 上一篇    下一篇

高压细水雾灭火喷嘴的雾化特性研究

范明豪;周华;杨华勇   

  1. 浙江大学流体传动及控制国家重点实验室
  • 发布日期:2002-09-15

RESEARCH ON ATOMIZATION CHARACTERISTICS OF HIGH-PRESSURE WATER MIST ATOMIZER FOR FIRE SUPPRESSION

Fan Minghao;Zhou Hua;Yang Huayong   

  1. Zhejiang University
  • Published:2002-09-15

摘要: 高压细水雾灭火系统是采用纯水液压技术的新型灭火装置,具有无环境污染、灭火迅速、用水量少和水渍损失极小等优点,是目前国际上推祟的哈龙替代系统。运用轴对称射流边界层动量积分法,对系统关键执行元件—直射式雾化喷嘴的内部流动进行分析,对边界层厚度δ和加速因子K这两个内部流动参数进行考查;同时对一些与灭火效果有关的外部雾化特性参数如出口速度和雾滴平均粒径SMD等进行分析,得出压力是影响外部雾化特性参数的最关键因素。认为8~9 Mpa是所设计喷嘴的最低稳定雾化工作压力区域。同时,喷嘴结构参数收缩角α、收缩段长度l/d对内部流动参数、外部雾化特性参数均有影响,但不明显。试验验证了上述分析结果,优选出了适合的喷嘴内部结构。

关键词: 灭火, 喷嘴, 雾化特性, 细水雾

Abstract: High-pressure water mist system is a new type of fire-fighting unit using water hydraulic technology. The advantages of water mist include environmentally friendly, fast and effective fire suppression, minimum quantity of water requirements, low water losses. It has been in fact widely expected the most potential substitute of Halon fire-fighting system. The inner flow state of the vital execute component—direct jet atomizer is analyzed by using axial symmetrical boundary momentum integral method. The atomizer shape dimension’s influence on two inner flow parameters, boundary layer thickness δ, accelerate factor K is assessed. Besides, the outer atomization characteristics related to fire-fighting performance, for instance, outlet velocity, Sauter Mean Diameter (SMD) is analyzed. Simulation results are experimentally verified. The results show that the system working pressure is the most important factor to these outer atomization characteristics and 8~9 Mpa is the appropriate area of stable atomization pressure for this prototype of direct jet atomizer. The atomizer shape dimensions include contract angle a, length of atomizer neck l/d has influence on inner flow parameters and outer atomizer characteristics, but not distinct. The optimum atomizer inner structure is selected.

Key words: Atomization characteristics, Fire-fighting Jet atomizer, Water mist

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