Numerical Simulation of Air-Conditioning Duct and Indoor Airflow in Subway Car

A subway car truck made by a factory is taken as a research object,a numerical analysis is carried out for the air flow and heat transfer conditions of the air-conditioning duct and three-dimensional space of the interior with car with software- FLUENT. According to European standard EN14750-1,the assessment of the air conditioning and ventilation design were conducted,which took into account the car-body wall heat transfer,the body heat and other heat transfer process. The calculation results show that when eight air outlets under the air conditioning units are removed,the uniformity of the subway air duct outlet is improved effectively with speed difference changes from 2.919 to 2.231 m/s,fissure type outlet can provide better air quality,and the air conditioning and ventilation systems in the subway car truck can meet the thermal comfort requirements of 226 passengers. The research results provide a reference for the rational design of the ventilation system in a subway air-conditioned train.