单液滴撞击受热枫桦木炭化表面的实验研究

doi:10.3969/j.issn.0438-1157.2013.08.015

化工学报 ›› 2013, Vol. 64 ›› Issue (8): 2807-2812.DOI: 10.3969/j.issn.0438-1157.2013.08.015

单液滴撞击受热枫桦木炭化表面的实验研究

蓝美娟, 李媛, 王喜世

中国科学技术大学火灾科学国家重点实验室, 安徽合肥 230027

收稿日期:2012-12-05 修回日期:2013-02-02 出版日期:2013-08-05 发布日期:2013-08-05
通讯作者: 王喜世
作者简介:蓝美娟(1988- ),女,硕士研究生。
基金资助:
国家重点基础研究发展计划项目(2012CB719704);国家科技支撑计划项目(2011BAK03B02)。

Drop impact onto charring surface of heated Betula costata wood

LAN Meijuan, LI Yuan, WANG Xishi

State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230027, Anhui, China

Received:2012-12-05 Revised:2013-02-02 Online:2013-08-05 Published:2013-08-05
Supported by:
supported by the National Basic Research Program of China(2012CB719704).

摘要/Abstract

摘要： 通过模拟实验研究了水滴及含4% 氟表面活性剂(AFFF)液滴分别撞击室温和加热枫桦木炭化表面的碰撞动态过程。实验中加热枫桦木表面温度为124.7℃,纯水滴初始直径为(2.4±0.1)mm,含4% AFFF液滴初始直径为(1.8±0.1)mm,液滴滴落高度为15~40 cm。采用Photron Fastcam高速摄影仪记录液滴碰撞的动态过程,拍摄帧数为2000 fps。研究结果表明:水滴撞击枫桦木炭化表面后飞溅液滴数、最大铺展因子都随着水滴撞击速度的增大而增大。纯水滴撞击加热枫桦木炭化表面4 ms后迅速飞溅形成次生液滴,小液滴滚动蒸发聚合成一个大液柱,大液柱起伏多次后形成一个小液柱停留在枫桦木表面。而含4% AFFF液滴撞击受热枫桦木炭化表面时,液滴碰撞后与木材发生良好浸润现象。

关键词: 木材火, 灭火, 细水雾, 添加剂, 液滴撞击

Abstract: An experiment was carried out to study the process of pure water drop and water drop with 4% surfactant AFFF impacting on wood surfaces heated or at room temperature.The temperature of the heated wood surface was 124.7℃,while the height of the drop was varied from 15 cm to 40 cm.The initial diameters of pure water drop and the water drop with 4% AFFF were fixed at (2.4±0.1)mm and (1.8±0.1)mm,respectively.The impacting processes were recorded by using a Photron Fastcam high-speed digital camera with 2000 fps.The experimental results show that the number of splashed droplets and the maximum spread factor increase as the impacting velocity of drop increases.When the pure water drop impacts on the heated charring wood surface,it will splash many daughter drops after 4 ms and produce a big liquid column on the surface.A few milliseconds later,the water drop changes to a small liquid column and stays on the wood surface.However,the well wetting process occurs with the water drop containing 4% AFFF.

Key words: wood fire, fire suppression, water mist, additive, drop impact

中图分类号:

X932

蓝美娟, 李媛, 王喜世. 单液滴撞击受热枫桦木炭化表面的实验研究[J]. 化工学报, 2013, 64(8): 2807-2812.

LAN Meijuan, LI Yuan, WANG Xishi. Drop impact onto charring surface of heated Betula costata wood[J]. CIESC Journal, 2013, 64(8): 2807-2812.

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单液滴撞击受热枫桦木炭化表面的实验研究

Drop impact onto charring surface of heated Betula costata wood

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