摘要
为了探索隧道内可燃液体蒸气的爆燃超压及火焰传播规律,该文采用1/20的缩尺寸隧道模型,以不同液体温度(30、40、50、60、70、78℃(沸点))下蒸发产生的乙醇蒸气为爆燃介质,分析不同时间点火的引爆情况及爆燃超压等数据。结果表明:蒸气的爆炸极限受到初始液体温度的影响,当蒸气温度低时爆炸极限范围小,同时所需要的引爆能量也会变大。被引爆乙醇蒸气的超压值沿隧道纵向呈现明显的双峰形状,同时在超压曲线第1次达到峰值时,燃料盘上方压力测点P1低于远离中心位置P2、P3处的超压值。此外,隧道内爆燃超压最大值会随着乙醇蒸气浓度的增加而呈现先增大后减小的趋势。
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.
作者
陈长坤
徐童
史聪灵
赵小龙
张宇伦
CHEN Changkun;XU Tong;SHI Congling;ZHAO Xiaolong;ZHANG Yulun(Institute of Disaster Prevention Science and Safety Technology,Central South University,Changsha 410075,China;Beijing Key Laboratory of Metro Fire and Passenger Transportation Safety,China Academy of Safety Science and Technology,Beijing 100012,China)
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第3期278-284,共7页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金资助项目(51576212,51622403).
关键词
缩尺寸隧道
可燃液体蒸气
爆燃
超压
bench-scale tunnel
flammable liquid vapor
deflagration
overpressure
