| In recent years, with the development of the city,traffic congestion problem is becoming seriously, many cities want to alleviate the traffic pressure through building subway line, by subway is the first choice for people. Passenger can?t be overemphasized on comfort in subway train, The comfortable inside the cabin caused passenger?s attention,which related to the air condition, the temperature field, velocity field and the pollutant concentration is the mainly performance for air condition. Currently, blowing cold air, the local high temperature, sultry in the summer rush are the problem, which affect the vehicle interior comfort. It used Airpak software to build a 3D model and research on numerical simulation with B-type subway train compartments as the object of the research. It taked two programs about optimizing return air arrangement to solve the problem. Program A:it sided the return air at the axis of rim cabin, the distance between outlet and return is 0.9m. Program B: the return air disposed at the junction between the roof and the side wall, outlet axis from the carriage axis 0.7m, meanwhile we can set reasonable air angle to improve vehicle interior comfort. The result showed that the influence of inlet arrangement for air distribution is certain. The two programs not only can avoid air problem,but also can improve comfort of train. The ADPI value of program A is 61.8%,still less than the ideal value 80%.That was to say :there were some areas where the temperature is too high or too low. It can improve the comfort through change blowing angle, if setting angle to 15° or 30°. it also can meet the demand. Program B: ADPI value reached 81%, which can meet comfort requirements of most of the passengers and improve the energy utilization rate which is 1.19, it is higher than the original proposal of the energy utilization rate which is 0.945. The results of this study provide a reference for the outlet air grille arrangement and settings. |
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