Venting duct of gas explosion was modeled by k-e turbulence model and eddy-dissipation-concept ( EDC) combustion model and flame propagation process during explosion venting was simultaneously analyzed. Effects of ignition position,membrane rupture pressure(Pv) ,size of venting duct and its structure on the maximum reduced pressure (Pv ) and the maximum rate of pressure rise were analyzed during the simulation. Results shown that burn-up in venting duct led to the increase of Pred ; and Pred was linearly increased with membrane rupture pressure augmentation; the increase of duct length or the decrease of its radius augment enhanced Pred, and the effect of the radius was much stronger; adoption of smooth,profiled area change between vessel and duct reduced Pred but radius of the change enhanced the explosion severity. The use of two ducts reduced Pred when the total venting area was fixed but their positions barely affected Pred.%采用k-ε湍流模型和涡耗散概念模型(EDC),建立泄爆管泄放气体爆炸的模型,并模拟泄爆过程中火焰的传播过程.分析点火位置、泄爆压力(pv)、泄爆管尺寸和结构对容器内爆炸超压(Pred)和压力上升速率的影响.结果表明:泄爆管内的气体爆炸是导致Pred异常上升的原因；Pred与Pv存在线性递增关系；泄爆管管长的增大或管径的减小均会增大Pred,且管径对其的影响更显著；泄爆管与容器之间采用平滑过渡的方式可降低pred,但增大平滑过渡半径会使Pred上升；总泄爆面积相同时,采用2根泄爆管可降低Pred,但两管的位置对Pred的影响不显著.
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