铁路空调硬卧车内气流分布的数值模拟

建立了铁路空调硬卧车内CFD仿真模型,对车厢内流场、温度场和热舒适性评价指标进行了分析。采用稳态不可压缩雷诺时均N-S方程、k-ε湍流模型,应用控制容积法和交错网格进行离散。计算了空调硬卧车内三维空气流场和温度场,并与实验结果进行了对照,两者吻合较好。在此基础上分析了车厢内人体热舒适性,结果表明车厢中部和端部铺位PMV分布不同,端部人体热舒适感较好,中部较差;而且同一计算断面不同铺位的人体热舒适感差异较大:上铺有较大区域PMV<-1.0,人体感觉较凉;中铺大部分区域-0.51.0,人体感觉偏暖。

Numerical Simulation to Air Distribution in Air-Conditioned Hard Sleeper Compartment

The CFD model for airflow,temperature fields and thermal comfort evaluation is established in air-conditioned hard sleeper compartment,where the steady incompressible Reynolds-averaged Navier-Stokes equations are investigated with control volume method and interlacing discrectization grid. Based on the airflow and temperature fields,the thermal comfort in the chamber is evaluated.It indicates that PMV distributions in the middle and at the end of the chamber are different,The thermal comfort at the end is more satisfied than that in the middle.The passengers feel slightly cooler in the upper berth with PMV<-1.0,the passengers feel well in the middle berth with-0.51.0 owing to the lower air speed velocity and higher temperature nearby.