Abstract: The experiments were performed on safety discharge of gas explosions in a vessel with a vent duct. Pressure variations and the flame development in the duct during the ducted vented explosion process were studied. The influence of initial pressure on the venting process was analyzed. Comparative study of confined explosions, simply vented explosions and ducted vented explosions were conducted. It is shown that peak pressure and the rate of pressure rise increase with the initial pressure for isolated closed explosion. For simply vented explosion, with the increase of initial pressure, the peak pressure increases first, then reduces, and finally increases. For ducted vented explosion process, higher initial pressure results in higher peak pressure, higher rate of pressure rise, higher positive pressure difference, and higher flame speed in duct entrance, and explosion intensity in the vessel is more sensitive to the change of initial pressure. Compared to closed explosion and simply vented explosion, with the increase of initial pressure, the difference between peak pressure for ducted vented explosion process and that for simply vented explosion is getting larger, while the difference between the peak pressure for ducted vented explosion process and that for closed explosion is getting smaller, with the rate of pressure rise obviously higher than that for closed explosion.

Key words: gas, explosion, safety, initial pressure, peak pressure, rate of pressure rise, flame speed

摘要： 开展了容器内气体爆炸通过导管安全泄放实验，研究了导管泄放气体爆炸过程中的压力变化及导管内火焰发展规律，分析了初始压力对导管泄放过程的影响，并对比研究了密闭容器爆炸、简单泄爆及导管泄爆过程。结果表明：容器内发生密闭爆炸时，爆炸压力及压力上升速率随着初压的升高而增加；简单泄爆时，随着初压的增加，容器内的压力峰值出现了先增加然后降低最后继续增加的过程；采用导管泄爆时，初始压力越高，容器内的压力峰值及压力上升速率越高，相同时刻对应的导管入口处与容器内最大正压差越大，导管入口端的火焰速率越大，容器内爆炸强度对初始压力的变化较为敏感；随着容器内初压升高，导管泄爆过程中容器内的压力峰值与简单泄爆的压力峰值相差越来越大，与对应的密闭爆炸时压力峰值越来越接近，且最大压力上升速率远远高于密闭爆炸。

关键词: 气体, 爆炸, 安全, 初始压力, 压力峰值, 压力上升速率, 火焰传播速率