高速列车明线交会压力波特性研究

Characteristics of Pressure Wave Induced by High Speed Trains Meeting in Open Air

列车交会压力波是影响列车运行安全性和乘客舒适性的重要因素之一,因此需对压力波特性展开研究。采用计算流体力学方法数值求解雷诺平均N—S方程,对不同时速和线间距下国产新型高速列车会车过程开展三维非定常仿真,得出了压力波以及侧向力的变化规律曲线。结果表明最大压力波幅值出现在尾车等截面与变截面过渡处的鼻尖高度位置。会车过程中,车体将承受两次排斥力和一次吸引力,这将对列车的稳定行驶产生一定的影响。压力波幅值和列车所受的侧向力均随会车速度的增大而增大,随会车线间距的增大而减小。

The pressure wave caused by two trains＇ meeting shows great effect on train＇s running safety and passengers＇ comfort,so it is necessary to study the pressure wave characteristics.The Reynolds Averaged N-S equations were numerically solved by utilizing CFD methods in order to simulate the three-dimensional unsteady China-made trains＇ meeting process at different speeds and with different railway distances.The time-history of pressure wave and side force were obtained.Results show that the maximal pressure wave amplitude is located at the tail of the train,the same level with the nose;two strong side forces and one maximum suction force occur between the two trains in the whole process of the trains＇ meeting which will have a negative effect on the stabilities of the high-speed trains;the pressure wave amplitude and side force increase as the speed increases and decrease as the railway distance becomes smaller.