密闭管道瓦斯爆炸冲击波冲量及压力上升速率的实验研究

Experimental study on shock wave impulse and pressure rise rate of gas explosion in airtight pipeline

针对矿井瓦斯爆炸破坏模式主要在压力破坏和冲量破坏的研究,实验分析瓦斯在密闭管道发生爆炸时瓦斯浓度对冲击波冲量及压力上升速率的影响,利用管道中距离点火源不同位置的压力传感器测试了不同浓度瓦斯的爆炸压力,对冲击波冲量及压力上升速率进行分析,为防爆抑爆提供依据。研究结果显示:在管道中距离点火源的不同位置上,当浓度为9.5%时,瓦斯爆炸冲击波冲量及压力上升速率最大;由于超压衰减和传播距离的增加,在距离点火源4m和8m时压力冲量较大;在瓦斯浓度较低的范围内瓦斯爆炸时,其压力上升速率增长较快,而随着浓度的增加在较宽的浓度范围内,能较稳定地维持在高位值。

The damage and failure mode of gas explosion in mine is usually caused by the pressure and impulse, os the influence of gas concentration on shock wave impulse and pressure rise rate of gas explosion in airtight pipeline was experimentally studied. The explosion pressure of gas with different concentrations were measured by pressure sensor in different positions away from the ignition source in the pipeline, and the shock wave impulse and pressure rise rate were analyzed to provide basis for the anti-explosion and explosion suppression. The results showed that in different positions away from the ignition source in the pipeline, when the concentration of gas is 9.5%, the shock wave impulse and pressure rising rate of gas explosion reach the maximum values. Due to the overpressure attenuation and the increase of propagation distance, the pressure impulse is bigger at the distances of 4m and 8m away from the ignition source. When the gas explosion happens with a lower gas concentration, the pressure rise rate increases rapidly, while with the increase of concentration in a wider range of concentration, it can be relatively stable to stay with high value.