摘要
为了研究管道长度对瓦斯爆燃爆炸波前流速与超压耦合关系的影响,采用数值模拟的方法研究了封闭管道内爆炸超压与波前流速的传播特征。研究结果表明：不同长度下管道内的最终爆炸超压均趋于0.7～0.9 MPa之间;对于较短管道,流速峰值相对较小,流速峰值的下降趋势较平缓,流速在正负区间的振荡频率较快;对于较长管道,流速峰值相对较大,峰值下降趋势较快,振荡频率较慢;在15～20 m之间存在一个临界长度,当管长大于临界长度时,管道内会出现2个最低超压峰值,当管长小于临界长度时,则管内只会出现1个最低超压峰值;首次流速峰值与超压表现出良好的正比关系,通过拟合得到不同长度下首次流速峰值与超压的耦合关系。研究成果可为今后受限空间内爆炸的预防与控制提供基础理论参考。
To study the influence of pipe length on the coupled relationship between the flow velocity of detonation front and peak overpressure caused by gas deflagration, the propagation characteristics of overpressure and velocity in a closed end pipe was studied by numerical simulation in this paper. The results show that all of the last explosion overpressure attenuate to 0.7~0.9 MPa in the pipes with dif-ferent lengths. For the short pipes, the peak value of velocity is relatively small, and the decline trend of the peak velocity value is relatively gentle, while the oscillation frequency of velocity is relatively fast in the positive and negative interval. For the relatively long pipes, the peak value of velocity is relatively large, and the decline of peak value is fast, while the oscillation frequency is small. In addition, there exists a critical length between 15 m and 20 m. When the pipe length is larger than the critical length, two minimum overpressure peaks will appear, and when the pipe length is shorter than the critical length, only one minimum overpressure peak appears. Moreover, the first peak value of velocity is in good proportion to the overpressure. The coupled relation between the first peak value of velocity and overpressure was obtained by the numerical data fitting. The results can provide reference to explosion prevention and control in the limited space.
出处
《采矿与安全工程学报》
EI
北大核心
2014年第3期476-482,共7页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51204174)
中国矿业大学人才引进&青年教师启航计划项目(2011RC07)
中央高校基本科研业务费专项资金项目(2012QNB01,2012DXS02)
江苏省普通高校研究生科研创新计划项目(CXZZ12_0960)
关键词
瓦斯爆炸
长度
流速
超压
振荡
gas explosion
length
velocity
overpressure
oscillation
