LPG罐车泄漏爆炸事故验证及影响因素数值模拟

液化石油气（LPG）是常见的易燃易爆化学品，采用PHAST程序中的UDM模型验证数值模拟的可行性，以控制变量法研究同一泄漏孔径下温度、环境和泄漏口方向对事故后果的影响规律.结果表明，随着温度升高，LPG泄漏扩散距离变远、闪火影响区域扩大，但喷射火辐射量随之降低，特别是在150~200 m距离时衰减明显；表面粗糙度值越低，LPG泄漏扩散越远，爆炸冲击波传播的较远，但表面粗糙度对喷射火热辐射强度影响较小；泄漏口方向对事故的影响较大，泄漏口水平方向的泄漏距离最远，泄漏口方向垂直向下时，容易形成液池，泄漏口向上时，扩散距离以及闪火和喷射火的影响范围最小. 

Numerical Simulation of Validation and Influence Factors ofExplosion Accident Caused from LPG Tank Leakage

The safety problem of liquefied petroleum gas (LPG) is significantly important since it is a frequently used chemical substance prone to ignition and explosion. The explosion case of LPG tanker in Linyi, Shandong, was investigated by the UDM model in PHAST software under the method of parameter controlling. The results show that the direction of leaking affects the explosion scenario remarkably. When it is upward or downward, the leaking and jet radiations have a minimum or maximum effect area, respectively, while horizontal, a liquid pool would be formed. With the increase of ambient temperature, the leaking and expansion distances and the influence area of flash fires increase while the jet flame radiation decreases, especially within the distance of 150~200 m. The surface-roughness affects little to the jet radiation intensity while the explosion shock wave shows a revered relation with it.