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基于三维定常不可压缩雷诺时均N-S方程和κ-ε双方程湍流模型,对在20m/s风速下10m高路堤上以300km/h车速运行的三车编组高速列车气动性能进行了模拟,并对路堤边坡结构形式进行了设计与优化.数值算法经验证与试验规律基本一致,幅值相差不超过10%.结果表明:路堤两侧设计成台阶对于改善列车气动性能效果显著.位于路堤不同线路上列车气动力和力矩随边坡台阶高度变化规律基本一致;各节车对应的相对最优台阶高度以及其所受气动力及力矩随台阶高度变化规律存在明显差异;台阶高度在3~5m间的边坡设计对改善路堤上运行的列车气动性能具有明显效果.边坡两侧顶部设计成台阶有效改善了列车气动性能;路堤边坡底部设计成高度相对较大的台阶对路堤上运行的列车气动性能有一定改善.
Based on the three-dimensional steady incompressible Reynolds-averaged Navier-Stokes equations and κ-ε two-equation turbulence model, the aerodynamic performance of a three-car high-speed train operating at a speed of 300km / h on a 10m high embankment at a wind speed of 20m / s was simulated. The design and optimization of embankment slope structure are carried out.The numerical algorithm is verified to be consistent with the experimental law, with the difference of not more than 10% .The results show that the design of the steps on both sides of the embankment has a significant effect on aerodynamic performance of the train.At the same time, The aerodynamic force and moment of the train are basically the same with the height of the slope; the relative optimal step height of each train and the variation of the aerodynamic force and moment with the height of the step have obvious differences; the height of the step is between 3 ~ 5m The slope design has obvious effect on improving the aerodynamic performance of the train running on the embankment.The design of the top on both sides of the slope effectively improves the aerodynamic performance of the train, and the bottom of the embankment slope is designed to be relatively high in height to the aerodynamic train running on the embankment A certain improvement in performance.