摘要
研究坡度隧道火灾排烟方法有助于隧道火灾中人员的救援与逃生.本文采用数值模拟方法研究了半横向通风方式下坡度隧道火灾过程中的排烟方法,分析了不同排烟方法时的排烟范围均匀系数λ和排烟热效率α.理论排烟量计算结果表明:坡度为0.0%~1.5%时,标准排烟方法可以有效地控制烟气在隧道内蔓延;当坡度在1.5%~3.0%范围内时,下坡方向烟气由于浮力的作用被控制在排烟口附近,此时为了有效排烟并同时提高风机排烟热效率,可采用上坡单侧排烟方法;当坡度大于3.0%时,由于烟囱效应作用使得隧道内的烟气蔓延速度加快,烟气迅速逃离排烟口蔓延至隧道出口,此时应在上坡方向增加纵向通风以抑制烟气的回流,才能更好地限制烟气蔓延.
The research on the method of smoke exhausted in sloping tunnels is helpful to the rescue and escape for crew in the tunnel fire.In order to explore the method of smoke exhausted in the tilted tunnel fire under the condition of semi-transverse ventilation,the numerical simulation is adopted to simulate the process of tunnel fire in this paper,and then analysing the rule of the coefficient ofλ(uniformity coefficient of smoke exhaust range)andα(the thermal efficiency of smoke exhaust)in different smoke-exhaust methods.Results show that when the slope is 0.0%~1.5%,the standard of smoke exhaust can control the smoke to spread effectively in the tunnel;When the slope is 1.5%~3.0%,smoke along the down-slope direction can be controlled near to exhaust port due to the effect of buoyancy,so the method of unilateral smoke exhaust in the upslope direction is adopted to exhaust effectively and improve heat efficiency of smoke exhaust of fans;But when the slope is more than 3.0%,the smoke exhaust rapidly escape from exhaust port and spread to the tunnel exit because of the chimney effect which makes the smoke exhaust in the tunnel spread with tremendous speed,so longitudinal ventilation should be added to restrain the reflux of smoke exhaust in the upslope direction,which restricts the spread of the smoke exhaust more effectively.
作者
楼波
覃日富
邱永海
LOU Bo ;QIN Rifu;QIU Yonghai(School of Electric Power,South China University of Technology,Guangzhou 510640,Guangdong,China)
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2018年第1期18-25,共8页
Journal of South China University of Technology(Natural Science Edition)
基金
广东省自然科学基金资助项目(S2013010016748)
广东省科技计划项目(2014A020216005)
广东省能源清洁高效利用重点实验室资助项目(2013A061401005)~~
关键词
坡度隧道火灾
半横向通风
排烟热效率
排烟范围均匀系数
tilted tunnel fire
semi-transverse ventilation
heat efficiency of smoke exhaust
well-distributed efficiency of smoke exhaust
