Analysis Of Southern City Type B Vehicle Passenger Compartment Airflow Organization

With the rapid development of China's economy,more and more cities choose to build urban rail transit,has been initially built the city subway operating network,provides the convenient transportation,passenger flow also showed an increasing trend year by year.Rail Vehicles are relatively sealed,the car staff density,running time interval is short,frequent passengers on and off,open and close the door causing frequent heat exchange inside and outside the air flow,thermal environment is unstable.The design and research of the air-conditioning system in China's urban rail transit system started late,and has only developed for more than ten years.The traditional design relies on the empirical formula.The factors affecting the airflow organization are not comprehensive and the variable analysis is inaccurate.Unable to accurate control of airflow organization distribution within the passenger compartment,can not meet the comfort requirements and effectively use the air conditioning unit cooling capacity,resulting in energy waste.With the improvement of people's material civilization and the enhancement of self-health care consciousness,passengers have more and more high demands on the thermal comfort of indoor environment of rail transit vehicles.It is urgent and necessary to apply new and more scientific methods to subway train air conditioning Ventilation system of airflow organization to improve and optimize the form.Based on the airflow pattern of subway passenger air conditioning system of subway type B vehicle,which is typical tropical monsoon climate in the south subtropical region.This paper analyzes and analyzes the data of the standard operating mode test and the actual operational test data.The measured data and the simulation are compared and analyzed,and the problems existing in the passenger airflow organization are analyzed.Based on the experience of design and measurement of airflow in traditional air-conditioning systems,the rationality of its application in the design of air-conditioning system for rail transit vehicles is discussed.The CFD simulation technology is used to simulate the two different types of air-conditioning,in order to study the optimal design of air conditioning and ventilation systems.Finally,the paper puts forward some suggestions to optimize the thermal comfort of air-conditioning organization in rail transit,so as to achieve the effect of comfort,energy-saving and environmental protection.