会聚压力波对天然气管道内火焰传播影响

Influence of Convergence Pressure Wave on Flame Propagation in Natural Gas Pipelines

为了对天然气管网更科学系统地进行安全性指标分析,在可燃气体爆炸机理基础上,建立了爆轰试验平台。通过设定障碍物参数和传感控制系统,在管道中进行两种不同工况试验,研究不稳定爆轰波在管道传播过程中压力波和反射波信号对火焰传播速度的影响规律。结果表明:在密闭型管道系统中,可燃气体发生爆炸反应时,经管壁、障碍物反射形成的波点叠加会聚作用会加剧爆炸反应程度,加速火焰传播;压力波对管壁动态应变与爆轰反应剧烈程度成正比,压力波的压力值变化并不呈单调衰减,而是起伏振荡;爆轰产生的压力变化时间早于火焰传播速度变化时间,反射压缩波与压力波的叠加作用影响火焰传播速度。

In order to scientifically and systematically analyze the safety indexes of natural gas pipe networks, the detonation test platform is established based on combustible gas explosion mechanism. Two experiments with different working conditions in pipelines are conducted through setting the obstruction parameters and sensor control system to study the influence law of pressure wave and reflected wave signals of unstable detonation wave in the pipeline transportation process on flame propagation velocity. The results show that in the closed pipeline system, when the combustib]e gas explodes, the wave point overlying and convergence caused by pipe wail and obstruction reflection will aggravate the explosion reaction degree and speed up the flame propagation; the pressure wave dynamic response to the pipe wall is proportional to the violent degree of the detonation reaction, and the pressure value of the pressure wave does not show monotonous attenuation, but fluctuation oscillation; the pressure change time of the detonation is earlier than the change time of the flame propagation velocity, and the flame propagation velocity is effected by the overlaying of the reflected compression wave and the pressure wave.