室内燃气火灾的数值模拟研究

Numerical simulation of compartment gaseous fire

通过采用FLUENT软件进行数值模拟计算的方法,将实际房间进行简化和抽象,建立模型用丙烷代替液化石油气作为燃料,来研究室内燃气火灾火焰蔓延过程。运用通用有限速率燃烧模型和大涡模拟模型来模拟750mm×500mm×50mm与750mm×500mm×250mm的箱体,研究了反应热、化学反应速率、火焰面分布以及箱体内各组分质量分数的分布,发现化学反应速率与反应热的变化趋势是一致的,大箱体的火焰面发展较小箱体快并且燃烧充分。

In order to study the flame spread progress of compartment gaseous fire,the method of numerical simulation is used,which is carried out by FLUENT.The numerical models are established by simplifying and abstracting the actual room with the size of 750 mm×500 mm×50 mm and 750 mm×500 mm×250 mm.The model employs propane as fuel instead of LPG.The model applies general finite rate combustion model and large eddy simulation model to simulate the rooms.By studying the distribution of heat of reaction,chemical reaction rate,flame surface distribution,and the mass fraction of each component in the rooms,we found that the chemical reaction rate is consistent with the change of the heat release rate.The combustion in the large box is better than that in the small box.