外界温度对民宅室内的火灾影响的数值仿真.pdfVIP

第 43 卷 第 9 期 天 津 大 学 学 报 Vol.43 No.9 2010 年 9 月 Journal of Tianjin University Sep. 2010 ▋ 外界温度对民宅室内火灾影响的数值仿真 郜 冶，霍 岩，武红梅 (哈尔滨工程大学航天与建筑工程学院 ，哈尔滨 150001) 摘 要 ：为了研究不同的外界温度情况对民宅室内火灾的影响，应用湍流大涡模 (LES)对哈尔滨市某小区内的一小 户型民宅室内火灾进行了数值模拟．模拟结果表明，进入室内的外界不同温度的处界气体对火势发展初期影响不大， 但会影响房间内的热积累，随着火势的发展，对热烟气流动的影响也逐渐明显．进入室内的不同温度的外界气体对火 灾烟气在水平方向上扩散影响较小；烟气层沉降速度会随着进入室内的外界气体温度降低而加快；外界温度越低，越有 利于抑制火势的扩大，但同时越不利于火灾产生的烟气等有毒物质的排出． 关键词 ：火灾；外界温度；场模拟 中图分类号：TU998.12 ；X932 文献标志码 ：A 文章编号 ：0493-2137 (2010)09-0777-06 Numerical Simulation of Effect of Ambient Temperature on Fire in Habitation GAO Ye ，HUO Yan ，WU Hong-mei (College of Aerospace and Civil Engineering ，Harbin Engineering University ，Harbin 150001 ，China) In order to assess the effect of ambient temperature on fires in habitation ，numerical simulations of fires in Abstract ： a small apartment in Harbin were conducted using large-eddy simulation (LES). Simulation results show that different ambient temperatures did not have much effect on fire development in the early stage but had influence on heat built- up of the apartment. The effect of smoke became more significant with the development of the fire. The sedimentation rate of smoke layer increased with the decrease of the ambient temperature ，however ，the horizontal motion rate of smoke was not affected by the ambient temperatures significantly. In addition ，fire spreading could be suppressed due to lower ambient temperature yet toxic p