Numerical simulation on the characteristics of smoke flow under piston wind in subway station hall fire

作者：Zhong Wei^*; Tu Rui; Yang Jianpeng; Liang Tianshui

来源：China Railway Science, 2013, 34(4): 118-124.

DOI：10.3969/j.issn.1001-4632.2013.04.20

• Flow charac-teristics
• Mechanical exhaust systems
• Piston winds
• Shaft
• Smoke flows
• Smoke stratification
• Three-dimensional model
• Wind channel

Taking subway station with the whole open screen door as a three-dimensional model, train, tunnel, subway hall and platform were simplified as cuboids. Based on the fluid dynamics software Fluent, pressure-based solver and SIMPLIC algorithm, both the flow characteristics of smoke in subway hall fire impacted by piston wind and the effect of adding bypass wind tunnel and shaft to weaken the influence of piston wind were investigated. The results show that the air flow field structure of subway hall will be changed complicatedly under the influence of piston wind. After the fire in subway hall, smoke stratification is destroyed by mechanical exhaust system, thermal buoyancy together with piston wind. The air flow directions and speeds change violently at each entrance of stairs, which leads to the smoke in subway hall into platform. Bypass wind channel and shaft can effectively weaken the influence of piston wind on smoke stratification in subway hall, delay the time and reduce the volume of smoke into platform.

• 出版日期2013
• 单位郑州大学