摘要
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。
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）.
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2012年第1期15-19,共5页
Journal of Nanjing Tech University(Natural Science Edition)
基金
江苏省普通高校研究生科研创新计划资助项目(CXZZ11-0367)
国家自然科学基金资助项目(50904037)
关键词
气体爆炸
泄爆
泄爆管
数值模拟
gas explosion
explosion venting
venting duct
numerical simulation
