The Numerical Simulation Analysis Of The Infiltration And Exfiltration Pattern Of Airflow Via Platform Screen Doors

At present, subway systems are running or under construction in our country, most of which adopt Platform Screen Door (PSD) systems. Despite of the wide use of PSD system, its simulation of infiltration and exfiltration develops little because of its complexity and instability. The cooling load of subway station air conditioning is directly influenced by the infiltration and exfiltration of the opened Platform Screen Doors. In order to compute accurately the cooling load of subway station air conditioning, predicting effectively the infiltration and exfiltration pattern of airflow via opened Platform Screen Doors is necessary.SES programme is used to simulate the piston wind in the tunnel when the train is coming, stopping or leaving. The result is taken as the boundary condition of the next 3D model simulation.Taking coming in, stopping and leaving out of a train as a period, the Platform Screen Doors infiltration and exfiltration pattern is simulated with CFD. With train's different speed, the period with PSD closed are divided into four cases, coming in fast, decelerating, accelerating and leaving fast. With tunnel's different block situation, the period with PSD open are divided into four cases, with train forward and backward, without train forward and backward, with train forward only and with train backward only. It is analyzed how the OTE and UPE system , the blocking traffic and the releasing air shaft affect PSD infiltration and exfiltration pattern, and the leakage of different cases is given.Finally, the heat transfer of PSD itself and load caused by the leakage of PSD are calculated, a load index is given as well.