中文摘要：

通过对包括CRH2在内的4种不同纵向长细比比例尺为1：8的高速列车模型进行风洞试验,分析雷诺数对车辆气动力系数的影响;比较4种高速列车模型的气动力特性;对不同流线型外形列车进行大侧偏角试验,研究高速列车在侧风作用下的安全性。研究结果表明：列车流线型头部越长,鼻形更加突出尖锐,头部流线型更加光滑,更有利于降低空气阻力;当模型列车流线型长度相差不大时,纵向长细比系数越大即车头外形越细长,对减阻越有利;4种动车组头车、中车和尾车的侧向力及升力系数均随侧滑角的增大而迅速增大;当侧滑角大于10°时,头部最大纵剖面轮廓线曲率较大的模型,横风作用下的侧向力系数比其他3种模型车的侧向力系数显著增大,升力系数较小。

英文摘要：

Wind tunnel experiments of four different longitudinal slenderness ratio high-speed trains including CRH2 were carried out to analyze the influence of Reynolds number on train aerodynamic force coefficients, with the scale of all models used being 1：8. The aerodynamics character of these four trains were compared and wind tunnel experiments were conducted with big side slip angle to research on the high-speed train safety under strong cross-wind. The results show that the aerodynamic drag can be reduced with the much longer streamlined head, more sharp nose and smoother streamlined head. Besides, when longitudinal slenderness ratio coefficient is lager, the head of train is longer and slender, it is the more favorable for the drag reduction when the difference among the length of train models is not much. As the side slip angle increases, the side force coefficient and lift coefficient of head car, middle car and tail car increase. When the side slip angle is greater than 10~, the side force of the train with the bigger maximum longitudinal profile curvature under cross-wind is significantly larger than those of the other three projects, while the lift coefficient is smaller.