中文摘要：

基于计算流体力学,采用滑移网格方法数值模拟了在有、无横风两种环境下高速列车以300km/h速度通过不同无砟轨道模型的空气动力学性能,研究了车体底板及转向架的表面压力特性,分析了列车与轨道周围的流场特性,研究了轨道结构对气动性能的影响.研究结果表明：当列车通过框架型轨道模型时,由于框架的存在,列车底板及转向架表面压力均呈现周期性波动现象,其压力波动的主频接近16.90Hz.在无横风环境下,列车车体底板的压力变化规律基本一致,且不同模型同一位置处的压力均值相差不大;在横风环境下,利用传统方法计算得到的车体底板压力幅值略大于框架型和平板型轨道模型的计算结果.

英文摘要：

Based on computer fluid dynamics, the aerodynamic characteristics of the 300km/h high-speed train passing through different ballastless track models were numerically simulated by using sliding mesh under crosswind and non-crosswind. The pressure performance of the train bottom plate and bogie, the flow field between the train and the track and the effect of track structure on train aerodynamic characteristics were analyzed. The results show that： When the train passing through the frame slab track model, the surface pressure of the bottom plate and bogie fluctuates cyclically due to the existence of the frame slab, and the main frequency of the pressure fluctuations is next to 16.90Hz. In the absence of crosswind, the pressure variation of the train bottom plate is consistent, and the mean pressure at the same position of different models is almost the same. Under crosswind, the value calculated by the conventional method is a little greater than that of the frame slab track model and plane slab track model.