点火能对预混气体爆炸过程及管道薄壁加载响应的影响

在两端封闭的无缝不锈钢管道中,利用压力传感器、应变片以及数据采集系统实验测试了不同点火能作用下,管道内甲烷-空气预混气体爆炸波发展规律及由此造成的管道外壁的动态响应。结果表明,点火能量越大,爆炸反应程度越剧烈,管道内最大爆炸压力就越大,管道薄壁的最大动态应变也越大,爆炸波发展就越迅速,并且管壁动态应变信号和压力波信号出现较好的一致性。本文结果可为油气长输管道的爆炸破坏效应研究提供一种新的思路和方法。

On the Influence of Ignition Energy on Dynamic Response of Pipe Wall in Premixed Gas Explosion Process

Adopting pressure transducers, strain gauges and a data acquisition system, the detonation development of premixed methane-air mixture and the dynamic response of pipe wall due to explosion under condition of different ignition energies were experimentally studied based on a seamless stainless steel pipe with two closed ends. Results show that along with the increase of ignition energy, the explosion reaction degree is more violent; the maximum explosion pressure is larger in pipe; the maximum dynamic strain on pipe wall is larger; the development of detonation is more rapid and the consistence between the dynamic strain signals and pressure signals on pipe wall is better. This study may provide a new idea and method for study of oil and gas long distance pipeline explosion damage effect.