高架桥声屏障高度对列车气动特性影响的数值模拟

采用计算流体力学方法对高架桥声屏障高度影响高速列车空气动力特性进行数值研究.通过网格划分、湍流模型选取、边界条件设置等来提高数值计算精度.结果表明,当高速列车运行在下风向时,头车、中间车上的侧向力随着声屏障高度增加而逐渐下降.头车所受的侧翻力矩在整车中最大,且随着声屏障高度的增加而逐渐减小.随着声屏障高度的增加,上风向工况下中间车受到的侧翻力矩要大于下风向工况.上、下风向工况下高速列车气动特性差异主要是由于流动空腔中列车所处的相对位置不同,改变了车体表面的压力分布,从而改变了车体所受到的气动力、力矩.

Numerical Study of the Effect of Viaduct Noise Barrier Height on Train Aerodynamic Characteristics

With computational fluid dynamics method,a numerical study on effect of viaduct noise barrier height on aerodynamic characteristics of a high speed train was made.High calculation precision is obtained with suitable meshing,appropriate turbulent model and boundary conditions.It shows that as moving in leeward the side force on head train or the middle train decreases gradually with increasing of noise barrier height.A rolling moment on the head is most and it falls as noise barrier height goes up.The rolling moment on middle train running in windward is greater than that in leeward as noise barrier height is increased.Under two running conditions,the train relative position in cavity flow is different and surface pressure distribution is changed.Accordingly,aerodynamic force or moment on train body is varied.