列车车厢内火灾烟气运动的数值模拟研究

使用大涡模拟和Smagorinsky亚格子尺度模型，以及简单化学快速反应燃烧模型，对列车车厢内火灾现象进行了数值模拟。由于热烟气的弱可压缩性，采用了适合于低马赫数形式的三维非稳态Navier—Stokes方程的近似形式数值研究烟气的输运过程。通过对不同释热率情况下火灾过程的研究，初步探讨了车厢内火灾发展、烟气运动和温度分布规律。采用的研究方法和所得结论对于列车火灾的防护设计和安全管理方面有一定指导意义。

Numerical simulation of smoke movement in train compartment fire accidents

The train fire scenario was simulated by use of large eddy simulation (LES), Smagorinsky sub-grid scale model (SGS) and the fast chemistry combustion model. Because of weak compressibility of hot smoke, the process of smoke movement was investigated by use of the filtered three-dimensional compressible Navier-Stokes equations under low Mach-number approximation. By studying fire process of different heat release rate, the development of train fire and smoke movement and temperature distribution law were discussed preliminary. The simulation system developed and the conclusions obtained is significative for train fire protection design and fire safety management.