Abstract: When a fire breaks out in an inclined tunnel, the thermal buoyancy induced by smoke temperature difference will induce airflow through the tunnel due to the stack effect. The induced longitudinal airflow is a key factor in inclined tunnel fires. In this talk, under the combined effect of induced longitudinal airflow and ambient pressure, the smoke movement and temperature distribution pattern are presented firstly. Then the variation of induced longitudinal airflow velocity with tunnel slope and ambient pressure is explained. Finally, taking the tunnel slope, the ambient pressure and the velocity of resulted induced longitudinal airflow into account, a correlation predicting the maximum smoke excess temperature beneath the ceiling is proposed and the correlation agrees well with previous experimental results at normal pressure. The results can provide an engineering reference for tunnel structural fire protection, smoke control and safe evacuation in inclined tunnels at different ambient pressures.

Biography: Dr. Long Ding is an associate professor at the State Key Laboratory of Fire Science, University of Science and Technology of China (USTC). He obtained Ph.D. degree in University of Chinese Academy of Sciences in 2018. Currently he is vice secretary general of the Popular Science & Public Education Committee of CFPA. His research interests include prevention and control of major accidents and disaster risks in uncertain environments. He has published more than 20 SCI papers, including more than 15 papers in top journals in the field of safety science. He has published one monograph on building fires and applied for one invention patent. He has been invited to give two speeches at academic conference.