室内火灾开口流动的FDS模拟

Numerical simulation analysis of vent flow in FDS

以Steckler开口流动实验数据作为参考,对比FDS模拟室内火灾开口流动的准确性及其影响因素。结果表明,在保证网格精度和正确的边界条件下,FDS对门洞开口质量流量的计算较为准确,而对窗户开口质量流量的预测误差较大;热释放速率的辐射分数和着火房间的压力升高都对模拟结果有一定的影响,对模型进行前期设置时应予以考虑。

Vent flow simulations using FDS were performed and the results are compared with Steckler＇s vent flow experimental data,on a purpose of evaluating the accuracy and setting-up influence of vent flow simulations via FDS.It is found by comparing the simulation results with the experimental data that FDS gives good prediction on doorway flows and weak projections on window flows,provided with a good grid resolution and right boundary conditions.Radiation fraction of heat release rate,together with the pressure rise in a fire room,is shown to pose influence on vent flow predictions.It is concluded that consideration of these factors is recommended when using FDS.