摘要
通过理论分析结合经验公式,构建铁路隧道火灾烟气逆流距离的计算模型。建立长为52.5 m、内径为1.1 m、缩尺寸(1:9)的实验模型隧道。设定了7个隧道坡度、4个纵向风速,用以模拟实际隧道火灾场景,获得不同坡度和不同通风情况下烟气逆流距离的变化。实验结果表明:隧道坡度及通风速度对烟气逆流距离具有明显影响。通过模型隧道火灾实验的测量结果与计算模型的预测结果的对比,验证了计算模型的有效性,可为铁路隧道防灾通风设计提供依据。
The computation model for calculating the distance of back-layering flow was built by theoretical analysis and empirical formula.A model tunnel was established in a reduced scale of 1：9.The model tunnel was 52.5 m in length,and it had a circular cross-section with an inner diameter of 1.1 m.Seven tunnel gradients and four longitudinal ventilation velocities were used to simulate different fire scenarios.The smoke longitudinal propagation data,with different longitudinal ventilation velocities and tunnel gradients were collected.Fire test results show that the length of back-layering smoke flow is effected by air velocity and tunnel slope.By comparing the fire tests data with the theoretical model prediction results,the theoretical model is proved to be valid.This computation model can provide the basis for railway tunnel ventilation design for fire prevention.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第9期2837-2842,共6页
Journal of Central South University:Science and Technology
基金
铁道部科技研究开发计划项目(2006G007-A-1
2006G007-C-1)
灭火救援技术公安部重点实验室开放课题(KF2011003)
中南大学中央高校基本科研业务费专项基金资助项目(2011QNZT109)
关键词
铁路隧道
模型实验
烟气逆流
计算模型
railway tunnel
model tunnel fire test
back-layering smoke flow
computation model
