不同送、排风模式对楼梯井烟囱效应的影响  

Influence of Different Air Supply and Exhaust Modes on the Chimney Effect of Stairwell

作　　者：杨林 解宇 陈文[1] 卢国胜[1] 蒲轹阳 袁罗 YANG Lin;XIE Yu;CHEN Wen;LU Guosheng;PU Liyang;YUAN Luo(School of Environment and Resources,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China)

机构地区：[1]西南科技大学环境与资源学院,四川绵阳621010

出　　处：《西南科技大学学报》2022年第4期35-41,共7页Journal of Southwest University of Science and Technology

摘　　要：为研究不同送、排风模式对建筑楼梯井内火灾烟气运动特性的影响,以绵阳市郊区某居民自建住宅的楼梯井为原型,利用FDS对自然排风、机械排风和机械送风3种模式的不同组合进行数值模拟,探究不同工况下楼梯井内气压差对井内烟气蔓延速率的影响,分析不同送、排风方式对烟囱效应强度的减弱效果。研究结果表明:在排风方式同为自然排风的工况下,设有机械送风的工况能较好抑制楼梯井的烟囱效应;在送风方式同为机械送风的工况下,机械排风的工况对烟囱效应的减弱效果比自然排风工况差;在相同的送、排风组合模式下,送、排风窗口或设备越多,对烟囱效应的抑制效果越好;烟气蔓延速率、楼梯井内气压差均与烟囱效应强度正相关,可将其作为评判烟囱效应强弱的指标。To research different send and exhaust air modes of the movement characteristics of fire smoke in the stairwell of buildings,taking a stairwell of a house constructed by a resident in Mianyang suburb as the prototype,using the different combinations of three models of FDS for natural ventilation,mechanical ventilation and mechanical air supply conducts the numerical simulation,and under different working conditions,explores the influence of the pressure difference in the stairwell on flue gas spread rate in the well,and analyzes the weakening effect of different air supply and exhaust modes on the intensity of chimney effect.The results show that the chimney effect of the stairwell can be suppressed better with mechanical air supply under the condition of natural air exhaust.Under the condition of mechanical air supply,the weakening effect of mechanical exhaust on chimney effect is worse than that of natural exhaust.Under the same combined mode of air supply and exhaust,the more to have air supply and exhaust windows or equipments,the better the suppression effect of chimney effect is.Smoke spreading rate and air pressure difference in stairwell are both positively correlated with the intensity of chimney effect,which can be used as the index to judge the chimney effectivity.

关 键 词：烟囱效应 FDS 楼梯井 火灾 气压 

分 类 号：TU973.34[建筑科学—结构工程]