Rolling stock operation generates several metallic particles related to wheel-rail and pantograph-catenary contacts and to the wear of braking components. Despite a composition different from outdoors, particulate matter pollution in underground stations must not be ignored as no consensus exists about its health impact on commuters and workers. Assessment of commuters and workers exposure has then become of major interest. Indeed, depending on the time spent underground, their daily exposure to particles can significantly differ. As spatiotemporal distribution of particulate pollutants can influence personal exposure, in the present work, numerical simulations and wind-tunnel experiments were conducted to assess particle concentrations. The dispersion of brake particles in the wake of a typical double-deck French train within an underground station with a central platform is assessed. Results obtained at a constant train speed show a strong correlation between the wake topology and particle dispersion in relation with the dynamics of vortical structures. Higher particle number concentrations (PNC) are found between the train and the station wall compared to those depicted at the platform side.

机车车辆运行会产生多种与轮轨和受电弓-悬链线接触以及制动部件磨损有关的金属颗粒。尽管成分与室外不同，但地铁站的颗粒物污染不容忽视，因为关于其对通勤者和工人的健康影响尚未达成共识。对通勤者和工人暴露的评估已成为主要关注点。事实上，根据在地下度过的时间，他们每天接触颗粒的时间可能会有很大不同。由于颗粒污染物的时空分布会影响个人暴露，在目前的工作中，进行了数值模拟和风洞实验来评估颗粒浓度。评估了在具有中央平台的地下车站内典型双层法国火车尾随制动颗粒的分散。在恒定列车速度下获得的结果表明，尾流拓扑和粒子弥散与涡流结构动力学之间存在很强的相关性。与站台一侧描绘的粒子数浓度 (PNC) 相比，列车和车站墙壁之间的粒子数浓度 (PNC) 更高。