Numerical Experiments on Critical Ventilation Velocity and Back-layer in Tunnel Fire  

作　　者：杨培中 金浩 邵钢 金先龙 

机构地区：[1]School of Mechanical and Power Engineering, Shanghai Jiaotong University, Shanghai 200030

出　　处：《Journal of Donghua University(English Edition)》2006年第3期42-46,共5页东华大学学报（英文版）

基　　金：Supported by the Shanghai Municipal Infor mation Fund Project (2004)

摘　　要：Full-scale numerical experiments were carried out on the vehicular fire in a long tunnel to study the critical ventilation velocity and back-layer distance with heat release rate of 5, 20 and 100 MW respectively. A computational fluid dynamics (CFD) model of fire-driven fluid flow FDS(Fire Dynamics Simulator) was used to solve numerically a form of the Navier-Stokes equations for fire. The results were compared with the expressions proposed in the literature. A modified equation for the critical ventilation velocity was given to better fit the experimental results. A bi-exponential model that well fitted the numerical experimental results was proposed to describe the relationship between back-layer distance and ventilation velocity.Full-scale numerical experiments were carried out on the vehicular fire in a long tunnel to study the critical ventilation velocity and back-layer distance with heat release rate of 5, 20 and 100MW respectively. A computational fluid dynamics （CFD） model of fire-driven fluid flow FDS（Fire Dynamics Simulator） was used to solve numerically a form of the Navier-Stokes equations for fire. The results were compared with the expressions proposed in the literature. A modified equation for the critical ventilation velocity was given to better fit the experimental results. A bi-exponential model that well fitted the numerical experimental results was proposed to describe the relationship between back-layer distance and ventilation velocity.

关 键 词：tunnel fire critical ventilation velocity heatrelease rate back-layer hi-exponential model. 

分 类 号：U458[建筑科学—桥梁与隧道工程]