半封闭空间瓦斯爆炸冲击波传播距离研究  

Study on propagation distance of gas explosion in semi-enclosed spaces

作　　者：杨书召[1] 吴金刚[1] 

机构地区：[1]河南工程学院安全工程学院,河南郑州451191

出　　处：《湖南科技大学学报（自然科学版）》2014年第1期8-11,共4页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：国家自然科学基金资助项目(51174080)

摘　　要：为揭示瓦斯在强爆和弱爆情况下冲击波超压变化规律,利用一维爆炸物理模型和爆炸理论,构建了冲击波超压随距离变化的数学模型,并用一端开口的半封闭爆炸试验装置,在保持瓦斯浓度和其他条件不变,仅改变点火能量大小实现了瓦斯爆燃和爆轰,验证理论求解.结果表明:半封闭受限空间内,爆燃情况下火焰传播速度要远小于爆轰条件下火焰传播速度,爆燃火焰传播速度为亚音速,爆轰为超音速;爆轰与爆燃的冲击波超压的理论解都小于实验值,但整个传播变化趋势基本一致;极强冲击波最大超压值与传播距离成反比,极弱冲击波最大超压值与传播距离的平方根成反比;爆燃和爆轰冲击波在燃烧区内的传播变化趋势与理论解基本吻合.研究结果为防治瓦斯爆炸破坏及爆炸事故灾害勘验提供了技术和理论支持.To reveal the laws about gas under the condition of strong detonation and weak detonation shock wave overpressure changing,with one -dimension explosion physical model and the theory,the mathematical model of shock wave overpressure changing with distance was set up.With a change of ignition energy and gas concentration of unchanged in the pipe,the gas detonation was achieved and the theory solution was verified in semi-enclosed space.Results show that the strong shock wave overpressure change is inversely proportional to the propagation distance, very weak shock wave overpressure and the propagation distance is inversely proportional to the square root of.Under the condition of deflagration flame propagation speed is much less than the detonation under the conditions of flame propagation speed.Detonation and deflagration of the theoretical solution is less than the experimental value,but the whole transmission trends are basically identical.Value theory solution agreed with the experimental values. The research results provide technical support and theoretical guidance for the prevention and control of gas explosion accident.

关 键 词：瓦斯爆炸 爆燃 爆轰 半封闭空间 

分 类 号：TD712.71[矿业工程—矿井通风与安全]