城市B型地铁车辆气流模拟与舒适性评价

AIRFLOW SIMULATION AND COMFORT EVALUATION OF SUBWAY VEHICLE OF CITY B-TYPE

本文以B型地铁车辆做为数值模拟的研究对象,在此模型基础上探索气流组织内部各因素之间的相互关系。模拟人体散热一直以来所用的边界条件是第一类、第二类边界条件,而采用这样的边界条件已经证实存在许多根本上无法克服的缺陷,本文通过第三类边界条件的方法,去解决人与环境之间的耦合散热问题。本文采用设定内热源的方法,结合已经证明了的人体与环境混合散热计算程序,模拟车辆运行中车厢内气流组织所能达到的稳定状态,并对温度场、速度场进行分析,同时用ADPI等指标对乘客做出了热舒适性评价,指出该车辆在气流组织以及热舒适方面的优劣之处以及原因所在。

In this paper, B-type metro vehicles are used as the research objects of numerical simulation. Based on this model, the relationships among various factors within the airflow organization are explored. The boundary conditions that have been used for simulating human body heat dissipation have been the first type and second type boundary conditions, but the use of such boundary conditions has been proven that there are many fundamentally insurmountable deficiencies. This paper uses the method of the third type of boundary conditions to solve human thermal coupling problems with the environment. In this paper, a method of setting internal heat sources combined with proven human and environmental heat dissipation calculation procedures to simulate the steady state that can be achieved by the air flow in the vehicle compartment during vehicle operation. The temperature field and velocity field were also analyzed. At the same time, the passengers were rated for thermal comfort using indicators such as ADPI, and the advantages and disadvantages of the vehicle in terms of airflow organization and thermal comfort as well as the reasons are pointed out.