摘要
在体积为 2 0 0 0m3 的实验基地 ,进行了半球面筛孔形障碍物对半球形气云爆燃压力的增长机制影响的实验研究。可燃介质是浓度为 7 8%的半球形乙炔 空气混合气云 ,气云内置半球面筛孔形障碍物 ,爆燃压力由精度为 0 5级、动态响应时间小于 1ms的压力变送器感受 ,点火装置为符合国际标准ISO 6 184“ExplosionProtectionSystem”和美国标准NFPA6 8“GuideForVentingofDeflagrations”的电火花点火。火焰传播过程的图像记录显示 ,爆燃火焰在遇到障碍物之前基本上以球面向外扩展 ,经过障碍物后会发生显著扭曲和折叠 ,燃烧速率增大。压力场测试结果表明 ,障碍物孔隙率越小、半径越大、层数越多 ,爆燃压力就越高。
The deflagration experiments were carried out in the 2000 m3 experimental base to study the increase mechanism of overpressure wave induced by a semispherical porous barrier. In the center of semispherical acetylene-air clouds with a mixture ratio 7.8% was an ignition electrode that met ISO 6184 Explosion Protection System and NFP A68 Guide For Venting of Deflagrations. The built-in semispherical porous barriers were concentric with the clouds. A data-acquisition system, with dynamic responding time less than 1 ms recorded the explosion pressure-time diagrams of deflagrations. It was clear from the simultaneous records of the deflagration process that the flame propagated in sphere initially and became bent and folded at barriers. Meanwhile the burning rate increased. The experimental results showed that the deflagration overpressure increased with the increase of barrier radius and the number of barriers. The deflagration overpressure also increased with the reduction of interspaced ratio.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2004年第2期173-176,共4页
CIESC Journal
基金
国家自然科学基金资助项目(No50076006)~~
关键词
可燃气云
爆燃
爆炸
Flammable materials
Porous materials
