气云内存在障碍物时的爆炸压力计算

Explosion pressure calculation of flam mable gas clouds with barriers

通过引入障碍物扰动因子,对球形可燃气云内存在对称障碍物的爆炸过程进行了理论分析,建立了物理和数学模型,并编制了爆炸压力场的计算程序,获得了气云爆炸压力与气云半径、距气云中心的距离之间的关系。按国际标准和美国标准建设了爆炸试验系统并进行了试验,计算结果与实验结果的偏差小于20%。将计算结果与多能模型方法比较,在气云爆炸超压与量纲一距离之间的关系上,结果与多能模型一致,且较大的气云与多能模型中较高的爆炸级别相对应。

Based on experimental and theoretical analyses on ex plosion process of flammable gas clouds with barriers, a physical and mathematic al model is suggested and a code is developed to calculate explosion pressure di stribution. The relationship among cloud explosion pressure, cloud radius and di stance from ignition point was derived. An experimental system that met ISO6164 “Explosion Protection System” and NFPA68 “Guide For Venting of Deflagrations ” was set up to prove the effectiveness of present calculation method. Compare d with the experimental results, the deviations of present calculated results ar e less than 20%. Present method provides a useful way to evaluate explosion grad e in the application of multi energy model.