中文摘要：

基于粘性流体的Navier-Stokes方程和k-ε双方程湍流模型，运用流体动力学数值仿真软件FLUENT对高速列车在真空管道内不同工作压力，以及不同运行速度条件下车体所受到的空气阻力进行数值仿真，得出真空管道内工作压力对列车空气阻力的影响规律。研究结果表明：列车运行速度越大，随着工作压力的降低，空气阻力减幅越大；在同一运行速度下，随着工作压力不断降低，空气阻力的减幅也越大。

英文摘要：

The aerodynamic drag of high-speed train in evacuated tube is studied by numerical simulation. Based on the 2D, viscosity, stable and incompressible Navier-Stokes equations and two-equation k-εturbulent model, the aerodynamic drag of high-speed train in 5 working pressure conditions at 3 different running speeds are calculated with finite volume method. The influence of different working pressure in evacuated tube on the aerodynamic drag is analyzed. The simulation result shows that the faster the running speed is, the larger decrease the aerodynamic drag of train have gotten as the working pressure continuously reduces; at certain running speed, the lower the working pressure is, the larger decrease the aerodynamic drag of train have gotten.