The diffuse air supply system(DASS)can provide a comfortable thermal environment in the public area of subway platform.However,there is air leakage from the platform screen doors in the real operation,and there is a need to further investigate the impact on the DASS airflow.This paper uses the numerical simulation method to study the ventilation effect of DASS in the platform public area under the influence of screen door leakage,and optimizes the opening position of diffuse panels of DASS.The results show that without the influence of the air leakage effect of the platform screen doors,the temperature distribution in the platform public area of the one side DASS scheme is uneven,and the temperature near the air supply is high with local areas exceeding 32℃.During the train arrival,for the case with the ceiling on the air supply side fully covered by diffuse panels,the air supply experiences a short circuit and part airflow is directly discharged from the escalator entrance.The temperature near the air supply side in the platform public area is higher than 30℃,and the temperature distribution is uneven.When the ceiling panels near the escalator are closed,air short circuit is avoided.The temperature in the platform public area is within the range of 23-30℃,and the ventilation effect is improved.During the train departure,the temperature of the occupied zone is within 28℃when the ceiling panels near the escalator are closed,meeting the thermal comfort requirements.
Subway platform public areaAir leakage of platform screen doorsDiffuse air supply systemVentilation effectNumerical simulation
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