Bench-scale experimental study of the deflagration overpressure of a flammable liquid vapor in a tunnel
CHEN Changkun1, XU Tong1, SHI Congling2, ZHAO Xiaolong1, ZHANG Yulun1
1. Institute of Disaster Prevention Science and Safety Technology, Central South University, Changsha 410075, China; 2. Beijing Key Laboratory of Metro Fire and Passenger Transportation Safety, China Academy of Safety Science and Technology, Beijing 100012, China
Abstract：The deflagration overpressure and flame propagation of ethanol vapor were investigated in a bench-scale tunnel. The characteristics of the deflagration flame and the overpressure were measured at liquid temperatures of 30℃, 40℃, 50℃, 60℃, 70℃ and 78℃ (boiling point). The results show that the explosion limit of vapor is affected by the initial liquid temperature. At low temperatures, the explosion limit range is quite small and the required detonation energy is very large. The overpressure of the ignited vapor had an obvious double-peak shape along the longitudinal direction of the tunnel. Meanwhile, when the overpressure reached peak at the first time, the pressure measuring points P1 above the fuel pins were lower than the overpressure of P2 and P3 away from the center. In addition, with increasing ethanol vapor concentration, the maximum detonation overpressure first increased and then decreased in the tunnel.
陈长坤, 徐童, 史聪灵, 赵小龙, 张宇伦. 隧道内可燃液体蒸气爆燃超压缩尺寸实验研究[J]. 清华大学学报（自然科学版）, 2020, 60(3): 278-284.
CHEN Changkun, XU Tong, SHI Congling, ZHAO Xiaolong, ZHANG Yulun. Bench-scale experimental study of the deflagration overpressure of a flammable liquid vapor in a tunnel. Journal of Tsinghua University(Science and Technology), 2020, 60(3): 278-284.
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2020, Vol. 60 
