摘要
为提高长通道内部挡烟性能,揭示挡烟垂壁在长通道烟流控制中的作用,利用数值模拟方法研究挡烟垂壁与火源的距离分别为4.2、6、9、12 m,垂壁高度在0.3~0.9 m时顶棚附近烟气温度纵向分布;拟合模拟数据得出挡烟垂壁位置与高度综合影响下长通道挡烟垂壁下游温度纵向分布预测公式,并通过1∶5小尺寸通道火灾试验对预测公式进行验证。结果表明:挡烟垂壁对其上下游烟气温度分布的影响分别表现为减缓衰减与加速衰减2种效果;随着垂高的增加,垂壁上游温升值增大,下游温升值减小,且下游温度衰减速率与垂壁高度有线性关系;挡烟垂壁离火源越远,烟气温度纵向衰减越慢,高温危险区域越大;试验温度数据与公式预测值二者吻合较好,验证了数值模型的有效性。
In order to improve the smoke blocking performance,and reveal the role of smoke barrier in smoke control of long channel,numerical simulations were carried out.The distribution of hot smoke temperature near the ceiling was studied with the distance between smoke barrier and fire source being4.2,6,9 and 12 m,respectively,as well as the height of the smoke barrier varying within the range of0-0.9 m.A longitudinal temperature distribution predictory formula was obtained for smoke flow in downstream of smoke barrier through the data fitting method.The formula was validated by 1 ∶ 5 scale channel fire experiments.Results show that the influences of the smoke barrier on the attenuation of the smoke temperatures in the upstream and downstream are respectively slow attenuation and accelerated attenuation,that with the increase of the barrier height,the temperature rise increases in the upstream region,while decreases in the downstream region,that height of the smoke barrier and the attenuation rate of the downstream temperature has a linear relationship,that the farther away from the fire source,the larger the dangerous range of high temperature smoke will be,and that the formula prediction results conform with the temperature data measured,which demonstrates the effectiveness of the reliability of the simulation model.
作者
王欢
齐庆杰
周新华
吴宪
姜海洋
赵尤信
WANG Huan;QI Qingjie;ZHOU Xinhua;WU Xian;JIANG Haiyang;ZHAO Youxin(College of Safety Science and Engineering, Liaoning Technical University, Fuxin Liaoning 123000, China;College of Science, Liaoning Technical University, Fuxin Liaoning 123000, China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2017年第11期24-30,共7页
China Safety Science Journal
基金
中国博士后科学基金面上资助(2016M591451)
辽宁省重点实验室项目(14-1176)
关键词
挡烟垂壁
无量纲温度
空气卷吸
长通道
衰减系数
smoke barrier
dimensionless temperature
air entrainment
long channel
attenuation coefficient
