高速列车通过峡谷风区时气动性能研究

Research on Aerodynamic Performance of High-speed Train through Canyon Wind Zone

基于三维非定常可压缩雷诺时均N-S方程和RNGκ-ε双方程湍流模型,采用滑移网格技术,对峡谷风作用下8车编组的高速列车进出隧道气动性能进行模拟,并对沿线风速进行监测。研究表明:列车平地上非定常数值计算所得气动力系数均方根与风洞试验结果规律一致,两者吻合较好。由于受狭道效应和峡谷中地形地貌的共同作用影响,桥上各监测点的风速呈非对称分布。列车从隧道中驶入峡谷风区和从风区驶入隧道中两过程,列车气动力系数变化有明显差别。列车在峡谷风区高速行驶过程中,列车气动力及力矩系数会因受到以峡谷风为主的地形风影响而出现明显波动,其中尾车侧向力系数和头车升力系数受影响变化最大,分别为67%和216%。

On the basis of the three-dimensional unsteady compressible Reynolds-averaged N-S equation and the RNG κ-εequation turbulence model , the aerodynamic performance of the 8-vehicle high-speed train running in-to-out of a tunnel under canyon winds was simutaled ,and the wind velocities along the railway line were moni-tored . The computational results show as follows ：The numerical simulation results are consistent with those of wind tunnel tests ;due to the influence of narrow passage effect and valley terrain , the wind velocity distri-bution on a bridge is asymmetric ;the difference between aerodynamic force changes of the train entering into the canyon and those of the train running out of the canyon is significant ;as the train is running at a high-speed on the railway line in the canyon wind zone , the aerodynamic forces and moment coefficents of the train are fluctua-ted obviously due to the gorge wind ;out of the fluctuated changes , the changes of the tail vehicle lateral force coeffi-cient and the head vehicle lift force coefficient are the largest , reaching 67% and 216% respectively .