超细水雾作用下瓦斯的爆炸压力及升压速率  

Methane Explosion Overpressure and Overpressure Rise Rate with Suppression by Ultra-Fine Water Mist

作　　者：秦文茜[1] 王喜世[1] 谷睿[1] 许红利[1] 

机构地区：[1]中国科学技术大学火灾科学国家重点实验室,合肥230027

出　　处：《燃烧科学与技术》2012年第1期90-95,共6页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(50774072);教育部新世纪优秀人才计划资助项目(NECT-07-0794);中央高校基本科研业务费专项资金青年创新基金资助项目(WK2320000002)

摘　　要：采用三面透明的长方体腔体模拟狭长空间内的瓦斯气体爆炸,研究了不同体积超细水雾对不同体积分数瓦斯气体爆炸的抑制作用.实验中采用GigaView高速摄影获取超细水雾抑制瓦斯爆炸的动态过程,采用两个PCB压力传感器测量超细水雾抑爆过程中腔内两个不同位置的压力变化情况.结果表明,瓦斯气体的爆炸压力、爆炸升压速率以及爆炸波的传播速度均随着超细水雾施加量的增加而明显降低.除爆炸被超细水雾完全抑制的情况外,爆炸波的传播速度可从接近声速下降到150,m/s,爆炸压力可降低78%,说明超细水雾抑制瓦斯爆炸是十分有效的.A cuboid stainless steel channel with three sides transparent was used to simulate methane gas explosion in a narrow space, and the mitigations of methane gas explosion with different concentrations by ultra-fine water mist with different volume content were investigated. A GigaView high-speed video camera was used to visualize the proc- ess of methane explosion under the influence of ultra-fine water mist. Two PCB pressure transducers were used to acquire the information of pressure at two different locations inside the channel. The experimental results show that explosion overpressure, overpressure rise rate and blast wave propagation velocity obviously decrease with the in- crease of volume content of the ultra-fine water mist. Blast wave propagation velocity can be reduced from sound speed to about 150 m/s, and the explosion overpressure can be reduced by about 78%, except for the cases where explosion was completely suppressed, which indicates that methane gas explosion mitigating with ultra-fine water mist is very effective.

关 键 词：细水雾 瓦斯 爆炸压力 升压速率 抑爆 

分 类 号：X932[环境科学与工程—安全科学]