To study the influence of external environmental conditions on the indoor parameters of the air-condi-tioned train on the Qinghai-Tibet line,the Realizable k-εmodel was adopted to numerically analyze the indoor temperature and velocity profiles of the running train in winter.The sol-air temperature curves and the sol-air temperature difference in four directions were obtained as this order:side wall 2>side wall 1>ceiling>floor. On condition of given fresh air parameters,the airflow velocity value in the section x=2.475 m close to side wall 1 is higher than that of x=0.675 m when the train was running across the Tanggula station as well as the distinct boundary between the bottom and the top of the section x=2.475 m.The airflow velocity of the given position along the compartment was below the limit value of the train compartment when the train was running across both the Golmud station at the lowest elevation and Tanggula station at the highest elevation of the line. The average value of airflow velocity for a given position in the compartment when the train was running across the Tangula station was higher than that of the Golmud station.The vertical temperature difference was less than 1 .5 ℃ when the train was running across the two stations,which can meet the thermal comfort require-ment of the passengers.%为研究青藏线(格—拉段)空调列车冬季运行过程中车外环境条件对车内环境参数的影响特征,采用湍流Realizable k-ε模型对车内速度场和温度场的沿线变化进行数值分析,得到了列车围护结构外表面各方位综合温度沿线变化曲线以及各方位综合温度差异由大到小的顺序.列车行经海拔最低的格尔木和海拔最高的唐古拉站点时,沿车长方向给定位置处的气流速度均低于车内允许风速上限值,车内同一位置温度的平均水平在唐古拉站点时要稍高于格尔木站点.列车行经2站点时在所选位置竖向温差均在1.5℃之内,符合舒适性要求.
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