Influence of piston wind on air quality of underground railway tunnels

The design of underground railway environment control system usually concerns on the interval air temperature, but ignores the control of interval air quality, which directly affects the air quality inside the train compartment. In order to analyse the influence of piston effect on the ventilation rate of interval tunnels, based on an actual case, simulates the interval tunnel ventilation system, compares the piston effect of the train under various scenarios, and concludes the approach to effectively improve the air quality of interval tunnels.