中文摘要：

为保障高速动车组的安全运行,亟需对强侧风下动车组的气动性能及防护措施进行研究。基于三维、非定常N-S方程和k-ε双方程湍流模型,对高路堤、强横风条件下,动车组和开孔式挡风墙的气动力进行数值模拟计算。综合分析动车组和挡风墙的计算结果,得出：动车组头车所受到的横向力和倾覆力矩最大;圆孔式挡风墙下运行动车组的横向气动性能比方孔式挡风墙的优;阵列式和交错式2种排列方式挡风墙挡风效果相差不大;20%,30%和40%这3种透风率挡风墙中,透风率为30%的挡风墙下运行动车组的横向气动性能最好;透风率为30%的挡风墙的孔径分别为15,20,25和30 cm时,动车组所受到的横向气动力以及挡风墙所受到的倾覆力矩均相差不大;头车横向力和倾覆力矩的最大值与最小值之间的相对误差分别为2.11%和1.86%,挡风墙所受到的倾覆力矩在有车和无车运行情况下,其最大值与最小值之间分别相差3.79%和0.81%。

英文摘要：

To guarantee high-speed Electric Multiple Units（EMU） moving safely,it is exigent to research on the aerodynamic performance of EMU and the wind-proof measures under strong wind.Based on three dimensional unsteady N-S equations and the k-ε turbulence model,numerical simulation calculation on the aerodynamic forces of EMU and windbreak wall（with holes） on condition of high embankment and strong wind were carried out.The results show that cross aerodynamic forces of the first car of EMU is the biggest.Circular hole is better than square hole for the windbreak wall.Array hole is not far different from interlaced hole for their break wind ability.Among the three wind transmittances of 20%,30% and 40% for windbreak wall,30% transmittance is the best one for the aerodynamic performance of EMU.When the aperture of 30% transmittance windbreak wall is seperately 15,20,25 and 30 cm,the aerodynamic forces of EMU and windbreak wall are changed slightly.The differences between the maximum and minimum for EMU＇s cross force and overturning moment are 2.11% and 1.86% respectively,and those of overturning moments for windbreak wall are 3.79% and 0.81% separately with or without the train moving.