中文摘要：

设计了球形容器内气体爆炸通过导管泄爆的试验系统,选用体积分数为10%（特殊说明除外）的甲烷和空气预混气体开展试验,研究了泄爆导管长度、容器容积、点火位置、气体体积分数、破膜压力等因素的影响。结果表明：泄爆导管越长,容器内的正压力峰值和负压力峰值越大;密闭爆炸时,球形容器的容积对爆炸压力峰值几乎无影响;不同容积球形容器内气体爆炸通过相同导管泄爆时（导管长度均为6 m,直径均为0.06 m）,容积大的容器内的压力锋值为小容器压力值的3.3倍,且大容器内的压力上升速率也明显高于密闭爆炸的情况;有泄爆导管存在时,尾部点火容器内的压力峰值高于中心点火;泄爆导管的存在使得容器内的压力峰值高于直接泄爆时的压力峰值;无论有、无泄爆导管,容器内的压力峰值均随破膜压力增加而增加,但差值越来越小,说明导管的存在对容器爆炸泄爆过程的影响趋向缓和,但导管的存在总是阻碍了泄爆过程,增加了爆炸的严重程度,因此,在泄爆设计时要充分考虑导管的影响,适当提高容器自身的耐压强度。

英文摘要：

The given paper is aimed at introducing our experimental study over the effect of the relief duct on the ventilation of the gas ex- plosion in a spherical vessel. We have implemented the experiment by using a premixed methane-air mixture（ [ φ （CH4） = 10 % ] without special instructions） to analyze the effects of the relief duct length, the vessel volume, the ignition position, the gas volume fraction and the membrane rupture pressure on the duct-venting explosion. The results of our experiment show that those parameters have significant effect on the process of the duct-vented explosion. In addition, both the positive pressure and negative pressure in the spherical vessel tend to increase with the increase of the length of the relief duct, whereas in the case of the closed explosion in the isolated spherical vessel, the vessel volume has hardly no effect on the peak pressure of gas explosion, for the gas explosion in the big vessel and the small vessel vented through the same relief duct（the duct length is 6 m and the diameter is 0.06 m） , though the peak pressure in the big vessel can be made as high as 3.3 times as much as the peak pressure in the small vessel. Therefore, as compared with the closed explosion in the big isolated vessel, for the duct-vented explosion, the rate of pressure rise in the big vessel can be significantly higher because for the duct-vented explosion, compared to central ignition, the peak pressure in the vessel for rear ignition is higher; the relief duct results in that peak pressure in the vessel can be made much higher than that for the simply vented explosion（ without relief duct）. Therefore, con- sidering the maximum reduced pressure, the duet-vented explosion, or simply the vented explosion, though the peak pressures in the ves- sel may increase with the increase of membrane rupture pressure, the difference can be gradually made smaller with the increase of the membrane rupture pressure, thus implying that the effect of the duct tends towards the mitigation. What