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  • 赵宇 ( 副教授 )

    的个人主页 http://faculty.dlut.edu.cn/2016011044/zh_CN/index.htm

  •   副教授   硕士生导师
论文成果 当前位置: 中文主页 >> 科学研究 >> 论文成果
Numerical investigation of airflow patterns and pollutant dispersions induced by a fleet of vehicles inside road tunnels using dynamic mesh part I: Traffic wind evaluation

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论文类型:期刊论文
第一作者:Song, Xiaocheng
通讯作者:Zhao, Y (reprint author), Dalian Univ Technol, Fac Infrastruct Engn, Sch Civil Engn, Inst Bldg Energy, Dalian 116024, Peoples R China.
合写作者:Zhao, Yu
发表时间:2019-09-01
发表刊物:ATMOSPHERIC ENVIRONMENT
收录刊物:SCIE、EI
卷号:212
页面范围:208-220
ISSN号:1352-2310
关键字:Road tunnel; Vehicles; Piston effect; Drag coefficient; Dynamic mesh
摘要:The transient piston effect induced by a fleet of vehicles that passes through a tunnel can dominate pollutant dispersion, human exposure, and tunnel ventilation. This study employed the realizable k-epsilon model together with the dynamic mesh technique to analyze the characteristics of the transient traffic piston effect inside a tunnel. A tunnel model with a length of 450 m and a 450-m extension from the outlet in the driveway direction was developed, which contained 36 gasoline-powered cars located in nine rows with four vehicles per row. The unsteady three-dimensional model was validated by comparing the simulation results with the field-measurement data of a real tunnel. The simulation results show that traffic wind was significant, and is sufficient for diluting the pollution inside the tunnel if the vehicle speed is over 20 km/h. The peak-to-valley ratio of traffic-wind velocity below 60 km/h in three specific planes (Z = 0.5 m, Z = 1.5 m, and the tunnel outlet) was in the range of 1.47-1.77, which was slower than the 40-km/h (2.00-2.36) and 20-km/h (2.45-3.09) cases. Ventilation fans should be added to ensure fresh air supply as well as human health and safety when the vehicle speed is not faster than 40 km/h. A drag coefficient of 0.1-0.3 should be used to increase the accuracy of the pressure analysis if a fleet of vehicles moves inside the tunnel at a speed of not less than 40 km/h.

 

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