The large eddy simulation was used to research the fire smoke movement of stairs-aisle combination structure. By analyzing the smoke and velocity vector field, the fire smoke movement in the building can be divided into five stages. On this basis, we modified the source code of fire dynamic simula-tor software and extract the information of smoke particle posi-tion with time. The Lagrangian trajectory of smoke particle in the building was obtained, this can display the typical move-ment form of fire smoke visually. When the fire smoke entered into aisle, it moved near the aisle wall firstly, and then the fire smoke moved more and more far from the wall. The circular trajectory path of fire smoke in the aisle became smaller with the time.%采用大涡模拟技术对居民自建房楼梯—走道组合结构中的火灾烟气运动规律进行数值模拟.通过对烟气及速度矢量场的分析发现,火灾烟气在建筑内的流动可以分为5个不同的阶段.通过对FDS源程序进行改进,提取烟气粒子的位置随时间变化的信息,得到烟气粒子的拉格朗日运动轨迹,展示烟气的几种典型运动形式.烟气在进入走道后最初的环形运动多是贴近壁面的,而后环形轨道路径越来越远离壁面靠近中心部位,环形轨迹的路径也越来越小.
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