Numerical study on effects of induced velocity on central extraction system in large tunnel fire
The effects of different induced velocities on the central extraction system for a tunnel are investigated for a 100MW fire scenario.Computer modeling is used for the investigation with a numerical simulation method.The selection of five different induced velocities is evaluated and compared.The smoke control strategy in this study is downstream dampers in the vicinity of fire site opened with number of three and the upstream jet fans supplying airflow as the induced velocity.Distributions of smoke propagation,temperature and visibility in variation of induced velocities are analyzed.The results show that larger induced velocity is needed to restrict smoke to the region between the fire site and the damper openings for safe evacuation.Additionally,the gradients of upstream temperature decreases as the induced velocity increases.The results also suggest that the impacts of the induced velocity on the upstream visibility have a correlation with the back layering.
tunnel extraction system induced velocity fire simulation
XU Zhisheng ZHAO Dong ZHANG Xin WANG Shan
Institute of Disaster Prevention Science & Safety Technology,Central South University,Changsha 410075,China
国际会议
2012 International Symposium on Safety Science and Technology (2012安全科学与技术国际会议)
南京
英文
678-684
2012-10-23（万方平台首次上网日期，不代表论文的发表时间）