无约束泄爆对甲烷/空气火焰传播特性影响的试验研究  

Experimental Study on Effect of Unconstrained Explosion Venting on Methane-air Flame Propagation Characteristics

作　　者：任少峰[1,2] 陈先锋[2] 王玉杰[2] 李登科[2] 刘杰[2] 

机构地区：[1]山东黄金矿业(莱州)有限公司焦家金矿 [2]武汉理工大学资源与环境工程学院,湖北武汉430070

出　　处：《中国安全科学学报》2013年第4期84-88,共5页China Safety Science Journal

基　　金：国家自然科学基金资助(51174153);公安部重点研究计划项目(2011ZDYJHBXF020);中央高校基本科研业务费专项资金资助(2012-II-011)

摘　　要：为防止可燃性气体爆炸事故,减小事故带来的危害,揭示无约束泄爆影响火焰结构的动力学演化过程。根据爆炸发生的环境和场所,建立开口泄爆管道试验平台,通过试验研究泄爆管道甲烷/空气预混火焰的传播特性。采用高速纹影摄像技术,清晰捕捉到预混火焰传播过程中的细微结构特征,并采用高频压力传感器采集管道内压力变化特性,分析泄压口比率对火焰传播特性的影响。结果研究表明,反射压力波对火焰传播速度的干涉作用明显;得出了泄压口比率与火焰传播特性的关系式;并发现泄压口比率为30%是火焰传播特性变化的拐点值,可作为有效泄爆设计的重要参考值。An explosion venting tube experimental system was built up and used to study effect of uncon- strained explosion venting on premixed methane-air flame propagation characteristics. The propagation characteristics of methane/air premixed flame were performed by test. A high speed schlieren photograph system was used to record the premixed flame microstructure and propagation behavior. A high frequency pressure sensor was used to acquire the changing pressure data. And the effect of pressure orifice ratio on flame propagation characteristics was discussed in detail. It was found that the reflected pressure wave had the relatively obvious interference effect on flame propagation velocity. The relation between the ratio and the propagation characteristics was figured out. The inflection point of propagation characteristics was obtained when the pressure orifice ratio was 30%, and could be used as the important reference value for designing of explosion venting.

关 键 词：无约束泄爆 甲烷 空气 火焰结构 传播特性 泄压口比率 

分 类 号：O643.2[理学—物理化学]