汽车发动机舱火灾全尺寸试验与FDS模拟研究

摘要

Full-scale experimental and numerical study on a car engine compartment were conducted,which was divided into two conditions and simulated circuit fire and oil fire,respectively.We focused on temperature distribution and its variation with time,radiative heat flux,heat release rate and CO concentration distribution of engine compartment with different fire source location.Resuits showed that,two methods both resulted in good data;condition 2 which simulates oil fire was more vigorous than condition 1 which simulates circuit fire.%针对某型小汽车发动机舱开展全尺寸火蔓延试验与FDS数值模拟研究.研究分为两个工况,分别模拟电路火灾和油路火灾,重点关注了发动机舱不同起火部位下,舱内各点的温度分布及随时间的变化规律,不同部位的辐射热通量,发动机舱热释放速率以及CO体积分数分布等反映发动机舱火灾燃烧特性的参数.结果表明:两种方法所得数据均合理有效;该型车油路火灾要比电路火灾更加剧烈.