不规则可燃气云爆炸威力预测方法研究

Predictive Methods for Explosion Power of Irregular Flammable Gas Cloud

采用计算流体动力学(CFD)方法,以实际球罐区甲烷泄漏扩散形成的不规则可燃气云为研究工况,探讨了不规则气云爆炸威力的模拟方法,并对比了实际形状可燃气云、最大直径球可燃气云、重心高度球可燃气云、等体积球可燃气云以及采用TNT当量法计算得到的气云爆炸超压值。结果表明,TNT当量法计算结果过于保守。等体积球、重心高度球、最大直径球与实际形状气云爆炸超压偏差分别为-13.9%、-17.2%、52.3%。采用等体积球法估算不规则可燃气云爆炸威力较为便捷,且精度较高。

The numerical method for explosion power of the irregular flammable gas cloud is discussed using the computational fluid dynamics in the situation of leakage and dispersion of methane in real spherical tank. The explosion overpressures are obtained and compared among the five kinds of flammable gas clouds（ FGC for short）,including the actual geometrical FGC,maximum diameter spherical FGC,centre of gravity spherical FGC,equal volume spherical FGC and the TNT equivalent FGC. The results indicate that the TNT equivalence method is too conservative. The errors of the equal volume spherical FGC,the centre of gravity spherical FGC and the maximum diameter spherical FGC with the actual geometry FGC are- 13. 9%,- 17. 2% and 52. 3% respectively. The predictive method of equal volume spherical FGC is simple and has a good accuracy.