摘要
为了研究爆炸波在封闭型系统的冲击和振荡特征及其特征参数变化规律,采用数值模拟的方法研究了封闭型管道内瓦斯爆炸的传播特征。研究结果表明:闭口型系统内的瓦斯爆炸呈明显的振荡特征,对于爆燃波,反射波有2道,即前驱冲击波的振荡和压缩波的振荡。由于冲击波的振荡叠加,使其最大爆炸超压和瞬态流速峰值与开口型系统相比较高,而且在反射波及稀疏波的影响下,爆炸波超压分为三个区。爆炸温度和动压同样呈明显的振荡特征,使得爆炸高温环境维持较长时间,爆炸动压在爆炸传播方向的动压与其他方向相比明显较大。研究结果解释了受限空间内爆炸破坏比开放型系统强烈的原因,为今后受限空间内爆炸的预防与控制提供了基础理论参考。
In order to study the effect of the blast wave oscillation on explosion parameters, the gas explosion propagation characteristics in a closed end pipe was studied by numerical simulation. The results show that the blast wave oscillates obviously in the pipe. There are two different reflection waves during deflagration. One is the front shock wave＇s reflection wave, and the other is the compression wave. The peak overpressure and the gas velocity in closed end pipe are higher than those in open end pipe. In addition, the evolution of explosion overpressure along the pipe can be divided into three parts under the influence of the reflection wave and the rarefaction wave. The temperature and dynamic pressure oscillation were also observed. The high temperature environment may maintain in a rather long time. The dynamic pressure in the direction of explosion propagation is higher than in other two directions. The above resuks explain why the explosion damage is more violent in the limited spaces than in open systems. The results give guidance for explosion prevention and control in the limited spaces.
出处
《振动与冲击》
EI
CSCD
北大核心
2012年第16期8-12,17,共6页
Journal of Vibration and Shock
基金
国家重点基础研究发展计划(973)项目(2011CB201205)
中国矿业大学人才引进和青年教师启航计划资助项目(2011RC07)
中央高校基本科研业务费专项资金资助(2012QNB01)
关键词
爆炸
冲击
振荡
瓦斯
explosion
shock
oscillation
methane
