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首页> 外文期刊>Atmospheric environment >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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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

机译：使用动态网状部分Ⅰ：交通风评价，道路隧道车辆车辆车辆队列气流模式和污染物分散体的数值研究

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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.
机译：通过隧道穿过隧道的车辆队列引起的瞬态活塞效应可以使污染物分散，人的暴露和隧道通风占主导地位。该研究采用可实现的K-epsilon模型与动态网格技术一起，分析隧道内部瞬态交通活塞效应的特性。开发了一种长度为450米和车道方向的出口长度为450米和450米延伸的隧道模型，其中包含36辆汽油动力汽车，位于九排，每排有四辆车辆。通过将模拟结果与真实隧道的现场测量数据进行比较，通过比较仿真结果来验证不稳定的三维模型。仿真结果表明，如果车速超过20公里/小时，交通风且足以用于稀释隧道内部的污染。在三个特定平面（Z = 0.5米，Z = 1.5米和隧道出口）中，交通风速低于60km / h的峰值比率在1.47-1.77的范围内，比40厘米/小时（2.00-2.36）和20公里/小时（2.45-3.09）案例。应添加通风风扇以确保当车速不超过40 km / h时，确保新的空气供应以及人类健康和安全性。如果车辆在隧道内移动不小于40 km / h的速度，则应使用0.1-0.3的阻力系数来提高压力分析的准确性。

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