火源距离与环廊进深对下沉式广场烟气阻隔效果的影响  

Influence of fire source distance and annular corridor depth on the smoke barrier effect of a sunken plaza

作　　者：段啸天 刘长春 思涛 张翌祥 杜雪 彭爽 DUAN Xiaotian;LIU Changchun;SI Tao;ZHANG Yixiang;DU Xue;PENG Shuang(School of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China;Xi'an Key Laboratory of Urban Public Safety and Fire Rescue,Xi'an 710054,China;Ordos Housing and Urban-Rural Development Bureau,Ordos 017010,China)

机构地区：[1]西安科技大学安全科学与工程学院,陕西西安710054 [2]西安市城市公共安全与消防救援重点实验室,陕西西安710054 [3]鄂尔多斯市住房和城乡建设局,内蒙古鄂尔多斯017010

出　　处：《安全与环境工程》2024年第5期87-94,共8页Safety and Environmental Engineering

基　　金：陕西省重点研发计划项目(2024SF-YBXM-657);陕西省自然科学基础研究计划项目(2022JM-281)。

摘　　要：针对四面围合形态环廊式下沉广场发生火灾可能造成烟气聚集的问题,运用FDS仿真软件模拟了不同火源距离与环廊进深对下沉广场内能见度、烟气速度场、安全区域面积的影响规律。结果表明:(1)增加火源距广场开口边缘距离或者四周环廊进深,均会促进烟气于环廊区域内持续发生碰撞并涌入广场开口内导致下沉广场排烟、隔烟功能失效;(2)固定环廊进深条件下,随着火源与下沉广场开口边缘距离的增加,广场内安全高度处的平均能见度骤减,最高可降低至6.34 m;(3)环廊进深与下沉广场开口内的能见度及安全区域占比均呈反比例关系,北侧环廊进深不变、两侧环廊进深由0 m增加至6 m时,广场开口内平均能见度降低了81.56%;两侧环廊进深不变、北侧环廊进深由0 m增加至4 m时,广场开口内安全区域占比下降了82.4%。For smoke accumulation caused by a fire in a four-sided enclosed annular corridor-type sunken plaza,the effect of different fire source distances and annular corridor depth on the visibility,smoke velocity field,and safety area in the sunken plaza was simulated using FDS simulation software.The results show that increasing the distance of the fire source or the depth of the surrounding corridor promotes the continuous collision of smoke in the area of the corridor and into the opening of the square,failing the sunken square smoke exhaust and smoke insulation function;the average visibility at the safe height in the square decreases sharply with the increase of the distance between the fire source and the edge of the opening of the sunken square,up to 6.34 m under the condition of fixed depth of the circular corridor;the depth of the annular corridor is inversely proportional to the visibility inside the opening of the sunken plaza and the percentage of the safety area.The depth of the ring corridor on the north side remains unchanged,the ring corridor on both sides increases from 0 m to 6m,and the average visibility in the square opening decreases by 81.56%;The depth of the ring corridor on both sides remains unchanged,while the ring corridor on the north side increases from 0 m to 4 m,and the proportion of the safe area in the square opening decreases by 82.4%.

关 键 词：环廊式下沉广场 烟气阻隔效果 火源距离 环廊进深 能见度 FDS 

分 类 号：X928.7[环境科学与工程—安全科学]