Characteristics of wind speed and PM10 concentration underneath railway trains

Abstract

Since operation of railway trains is a major source of particle pollution in tunnel air, a particle removal device can be an effective measure to remove wear particles. To obtain design conditions of the particle removal device that will be installed underneath the railway trains, the wind speed and particle concentration underneath the trains were investigated using a three-dimensional ultrasonic anemometer and a DustTrak aerosol monitor, respectively. The measurements were made for the trains running on Seoul Metropolitan Subway Line 5 on February 10, 2015. The data were analyzed according to the track geometry (straight, curved) and train speed pattern (acceleration, cruising, and deceleration) between stations. Train speed was also analyzed. The average wind speed and PM10 concentration underneath the trains were ~30% of the train speed and ~200 ？g/m3 for both straight and curved sections. Average PM10 concentration for deceleration sections was higher than that for acceleration sections. ？ 2017 The Korean Society for Railway. All rights reserved.