学术论文

      高密度人员空间分布对地铁火灾烟气扩散的影响

      Effects of the high-density spatial distribution of passengers on smoke diffusion in subway fire

      摘要:
      地铁大规模人员空间分布对内部流场影响的研究较少,为了研究人员空间分布对地铁火灾内部流场变化以及烟气蔓延的影响,利用火灾动力学模拟软件(FDS)对4种人员分布工况进行站台火灾模拟.结果表明:无人工况下,烟气大范围蔓延并迅速沉降至地面;而高密度人员分布时,从楼梯口补入的空气量减少,影响了烟气羽流对冷空气的卷吸,导致烟气生成速率降低,人员分布最密集工况下烟气层厚度减小1.8 m,同时,高密度人员分布对楼梯口补风气流流速和流向的改变,也影响了整个站台层压力场的分布,利于烟气自然分层.
      Abstract:
      Few studies about the influence of passengers' large-scale distribution on subway interior flow field were studied.By using fire dynamic simulation(FDS) software to simulate the platform fire in four cases of passengers' spatial distributions,the effects on the changes of subway interior flow field and smoke diffusion were evaluated.Results showed that smoke spread widely and subsided to ground rapidly in an unmanned case.However,in the cases where passengers were in high density,air supply from stair heads became less and it affected smoke plume's entrainment of cold air,leading to the decrease of smoke production.Obviously,the thickness of smoke layer was reduced by 1.8 m when passengers were in densest distribution.Meanwhile,passengers in high density could change the velocity and direction of air flows from stair heads and its disturbance on pressure field was good for the natural formation of smoke layer.
      Author: SHI Langjun JIANG Juncheng ZHOU Ru ZHAO Dong WU Fan CHEN Yicen
      作者单位: 南京工业大学 安全科学与工程学院,江苏南京,211800
      年,卷(期): 2017, 39(2)
      分类号: TK121
      在线出版日期: 2017年5月16日
      基金项目: 国家自然科学基金,江苏省自然科学基金