Dynamic Analysis of the Airflows in the Subway System : Field Measurements and the Computer Simulation(Fluids Engineering)

Abstract

The self-consistent equations of the piston effect are used to calculate the behaviors of the unsteady airflows caused by the moving trains in the subway system. The system is composed of the tunnel for trains, pathways or stairways for passengers, and ducts for the ventilation or the air-conditioning, and strongly has the one-dimensional aspects. In order to make the one-dimensional pipe line net-work, every component of the system is transposed to the equivalent pipe, and is connected up each other to form the three station model. By making use of the theory of the piston effect and the interfering model of airflows with division or combining, the dynamic behaviors of the airflows are calculated as the computer simulation, and are compared with the field data measured in the real subway system. The result of simulation has a good agreement with the field measurements.