采用泄爆管泄放气体爆炸的数值模拟

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(P_red)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P_red异常上升的原因;P_red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P_red,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P_red,但增大平滑过渡半径会使P_red上升;总泄爆面积相同时,采用2根泄爆管可降低P_red,但两管的位置对P_red的影响不显著。

Numerical simulation of ducted venting of gas explosion

Venting duct of gas explosion was modeled by k-εturbulence 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（p_v）,size of venting duct and its structure on the maximum reduced pressure(p_red) 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 p_red;and p_red was linearly increased with membrane rupture pressure augmentation;the increase of duct length or the decrease of its radius augment enhanced p_red,and the effect of the radius was much stronger;adoption of smooth,profiled area change between vessel and duct reduced p_red but radius of the change enhanced the explosion severity.The use of two ducts reduced p_red when the total venting area was fixed but their positions barely affected p_red.